5 collectd.conf - Configuration for the system statistics collection daemon B<collectd>
9 BaseDir "/var/lib/collectd"
10 PIDFile "/run/collectd.pid"
31 This config file controls how the system statistics collection daemon
32 B<collectd> behaves. The most significant option is B<LoadPlugin>, which
33 controls which plugins to load. These plugins ultimately define collectd's
34 behavior. If the B<AutoLoadPlugin> option has been enabled, the explicit
35 B<LoadPlugin> lines may be omitted for all plugins with a configuration block,
36 i.e. a C<E<lt>PluginE<nbsp>...E<gt>> block.
38 The syntax of this config file is similar to the config file of the famous
39 I<Apache> webserver. Each line contains either an option (a key and a list of
40 one or more values) or a section-start or -end. Empty lines and everything
41 after a non-quoted hash-symbol (C<#>) is ignored. I<Keys> are unquoted
42 strings, consisting only of alphanumeric characters and the underscore (C<_>)
43 character. Keys are handled case insensitive by I<collectd> itself and all
44 plugins included with it. I<Values> can either be an I<unquoted string>, a
45 I<quoted string> (enclosed in double-quotes) a I<number> or a I<boolean>
46 expression. I<Unquoted strings> consist of only alphanumeric characters and
47 underscores (C<_>) and do not need to be quoted. I<Quoted strings> are
48 enclosed in double quotes (C<">). You can use the backslash character (C<\>)
49 to include double quotes as part of the string. I<Numbers> can be specified in
50 decimal and floating point format (using a dot C<.> as decimal separator),
51 hexadecimal when using the C<0x> prefix and octal with a leading zero (C<0>).
52 I<Boolean> values are either B<true> or B<false>.
54 Lines may be wrapped by using C<\> as the last character before the newline.
55 This allows long lines to be split into multiple lines. Quoted strings may be
56 wrapped as well. However, those are treated special in that whitespace at the
57 beginning of the following lines will be ignored, which allows for nicely
58 indenting the wrapped lines.
60 The configuration is read and processed in order, i.e. from top to bottom. So
61 the plugins are loaded in the order listed in this config file. It is a good
62 idea to load any logging plugins first in order to catch messages from plugins
63 during configuration. Also, unless B<AutoLoadPlugin> is enabled, the
64 B<LoadPlugin> option I<must> occur I<before> the appropriate
65 C<E<lt>B<Plugin> ...E<gt>> block.
71 =item B<BaseDir> I<Directory>
73 Sets the base directory. This is the directory beneath all RRD-files are
74 created. Possibly more subdirectories are created. This is also the working
75 directory for the daemon.
77 =item B<LoadPlugin> I<Plugin>
79 Loads the plugin I<Plugin>. This is required to load plugins, unless the
80 B<AutoLoadPlugin> option is enabled (see below). Without any loaded plugins,
81 I<collectd> will be mostly useless.
83 Only the first B<LoadPlugin> statement or block for a given plugin name has any
84 effect. This is useful when you want to split up the configuration into smaller
85 files and want each file to be "self contained", i.e. it contains a B<Plugin>
86 block I<and> then appropriate B<LoadPlugin> statement. The downside is that if
87 you have multiple conflicting B<LoadPlugin> blocks, e.g. when they specify
88 different intervals, only one of them (the first one encountered) will take
89 effect and all others will be silently ignored.
91 B<LoadPlugin> may either be a simple configuration I<statement> or a I<block>
92 with additional options, affecting the behavior of B<LoadPlugin>. A simple
93 statement looks like this:
97 Options inside a B<LoadPlugin> block can override default settings and
98 influence the way plugins are loaded, e.g.:
104 The following options are valid inside B<LoadPlugin> blocks:
108 =item B<Globals> B<true|false>
110 If enabled, collectd will export all global symbols of the plugin (and of all
111 libraries loaded as dependencies of the plugin) and, thus, makes those symbols
112 available for resolving unresolved symbols in subsequently loaded plugins if
113 that is supported by your system.
115 This is useful (or possibly even required), e.g., when loading a plugin that
116 embeds some scripting language into the daemon (e.g. the I<Perl> and
117 I<Python plugins>). Scripting languages usually provide means to load
118 extensions written in C. Those extensions require symbols provided by the
119 interpreter, which is loaded as a dependency of the respective collectd plugin.
120 See the documentation of those plugins (e.g., L<collectd-perl(5)> or
121 L<collectd-python(5)>) for details.
123 By default, this is disabled. As a special exception, if the plugin name is
124 either C<perl> or C<python>, the default is changed to enabled in order to keep
125 the average user from ever having to deal with this low level linking stuff.
127 =item B<Interval> I<Seconds>
129 Sets a plugin-specific interval for collecting metrics. This overrides the
130 global B<Interval> setting. If a plugin provides own support for specifying an
131 interval, that setting will take precedence.
133 =item B<FlushInterval> I<Seconds>
135 Specifies the the interval, in seconds, to call the flush callback if it's
136 defined in this plugin. By default, this is disabled
138 =item B<FlushTimeout> I<Seconds>
140 Specifies the value of the timeout argument of the flush callback.
144 =item B<AutoLoadPlugin> B<false>|B<true>
146 When set to B<false> (the default), each plugin needs to be loaded explicitly,
147 using the B<LoadPlugin> statement documented above. If a
148 B<E<lt>PluginE<nbsp>...E<gt>> block is encountered and no configuration
149 handling callback for this plugin has been registered, a warning is logged and
150 the block is ignored.
152 When set to B<true>, explicit B<LoadPlugin> statements are not required. Each
153 B<E<lt>PluginE<nbsp>...E<gt>> block acts as if it was immediately preceded by a
154 B<LoadPlugin> statement. B<LoadPlugin> statements are still required for
155 plugins that don't provide any configuration, e.g. the I<Load plugin>.
157 =item B<CollectInternalStats> B<false>|B<true>
159 When set to B<true>, various statistics about the I<collectd> daemon will be
160 collected, with "collectd" as the I<plugin name>. Defaults to B<false>.
162 The "write_queue" I<plugin instance> reports the number of elements currently
163 queued and the number of elements dropped off the queue by the
164 B<WriteQueueLimitLow>/B<WriteQueueLimitHigh> mechanism.
166 The "cache" I<plugin instance> reports the number of elements in the value list
167 cache (the cache you can interact with using L<collectd-unixsock(5)>).
169 =item B<Include> I<Path> [I<pattern>]
171 If I<Path> points to a file, includes that file. If I<Path> points to a
172 directory, recursively includes all files within that directory and its
173 subdirectories. If the C<wordexp> function is available on your system,
174 shell-like wildcards are expanded before files are included. This means you can
175 use statements like the following:
177 Include "/etc/collectd.d/*.conf"
179 Starting with version 5.3, this may also be a block in which further options
180 affecting the behavior of B<Include> may be specified. The following option is
183 <Include "/etc/collectd.d">
189 =item B<Filter> I<pattern>
191 If the C<fnmatch> function is available on your system, a shell-like wildcard
192 I<pattern> may be specified to filter which files to include. This may be used
193 in combination with recursively including a directory to easily be able to
194 arbitrarily mix configuration files and other documents (e.g. README files).
195 The given example is similar to the first example above but includes all files
196 matching C<*.conf> in any subdirectory of C</etc/collectd.d>:
198 Include "/etc/collectd.d" "*.conf"
202 If more than one files are included by a single B<Include> option, the files
203 will be included in lexicographical order (as defined by the C<strcmp>
204 function). Thus, you can e.E<nbsp>g. use numbered prefixes to specify the
205 order in which the files are loaded.
207 To prevent loops and shooting yourself in the foot in interesting ways the
208 nesting is limited to a depth of 8E<nbsp>levels, which should be sufficient for
209 most uses. Since symlinks are followed it is still possible to crash the daemon
210 by looping symlinks. In our opinion significant stupidity should result in an
211 appropriate amount of pain.
213 It is no problem to have a block like C<E<lt>Plugin fooE<gt>> in more than one
214 file, but you cannot include files from within blocks.
216 =item B<PIDFile> I<File>
218 Sets where to write the PID file to. This file is overwritten when it exists
219 and deleted when the program is stopped. Some init-scripts might override this
220 setting using the B<-P> command-line option.
222 =item B<PluginDir> I<Directory>
224 Path to the plugins (shared objects) of collectd.
226 =item B<TypesDB> I<File> [I<File> ...]
228 Set one or more files that contain the data-set descriptions. See
229 L<types.db(5)> for a description of the format of this file.
231 =item B<Interval> I<Seconds>
233 Configures the interval in which to query the read plugins. Obviously smaller
234 values lead to a higher system load produced by collectd, while higher values
235 lead to more coarse statistics.
237 B<Warning:> You should set this once and then never touch it again. If you do,
238 I<you will have to delete all your RRD files> or know some serious RRDtool
239 magic! (Assuming you're using the I<RRDtool> or I<RRDCacheD> plugin.)
241 =item B<MaxReadInterval> I<Seconds>
243 Read plugin doubles interval between queries after each failed attempt
246 This options limits the maximum value of the interval. The default value is
249 =item B<Timeout> I<Iterations>
251 Consider a value list "missing" when no update has been read or received for
252 I<Iterations> iterations. By default, I<collectd> considers a value list
253 missing when no update has been received for twice the update interval. Since
254 this setting uses iterations, the maximum allowed time without update depends
255 on the I<Interval> information contained in each value list. This is used in
256 the I<Threshold> configuration to dispatch notifications about missing values,
257 see L<collectd-threshold(5)> for details.
259 =item B<ReadThreads> I<Num>
261 Number of threads to start for reading plugins. The default value is B<5>, but
262 you may want to increase this if you have more than five plugins that take a
263 long time to read. Mostly those are plugins that do network-IO. Setting this to
264 a value higher than the number of registered read callbacks is not recommended.
266 =item B<WriteThreads> I<Num>
268 Number of threads to start for dispatching value lists to write plugins. The
269 default value is B<5>, but you may want to increase this if you have more than
270 five plugins that may take relatively long to write to.
272 =item B<WriteQueueLimitHigh> I<HighNum>
274 =item B<WriteQueueLimitLow> I<LowNum>
276 Metrics are read by the I<read threads> and then put into a queue to be handled
277 by the I<write threads>. If one of the I<write plugins> is slow (e.g. network
278 timeouts, I/O saturation of the disk) this queue will grow. In order to avoid
279 running into memory issues in such a case, you can limit the size of this
282 By default, there is no limit and memory may grow indefinitely. This is most
283 likely not an issue for clients, i.e. instances that only handle the local
284 metrics. For servers it is recommended to set this to a non-zero value, though.
286 You can set the limits using B<WriteQueueLimitHigh> and B<WriteQueueLimitLow>.
287 Each of them takes a numerical argument which is the number of metrics in the
288 queue. If there are I<HighNum> metrics in the queue, any new metrics I<will> be
289 dropped. If there are less than I<LowNum> metrics in the queue, all new metrics
290 I<will> be enqueued. If the number of metrics currently in the queue is between
291 I<LowNum> and I<HighNum>, the metric is dropped with a probability that is
292 proportional to the number of metrics in the queue (i.e. it increases linearly
293 until it reaches 100%.)
295 If B<WriteQueueLimitHigh> is set to non-zero and B<WriteQueueLimitLow> is
296 unset, the latter will default to half of B<WriteQueueLimitHigh>.
298 If you do not want to randomly drop values when the queue size is between
299 I<LowNum> and I<HighNum>, set B<WriteQueueLimitHigh> and B<WriteQueueLimitLow>
302 Enabling the B<CollectInternalStats> option is of great help to figure out the
303 values to set B<WriteQueueLimitHigh> and B<WriteQueueLimitLow> to.
305 =item B<Hostname> I<Name>
307 Sets the hostname that identifies a host. If you omit this setting, the
308 hostname will be determined using the L<gethostname(2)> system call.
310 =item B<FQDNLookup> B<true|false>
312 If B<Hostname> is determined automatically this setting controls whether or not
313 the daemon should try to figure out the "fully qualified domain name", FQDN.
314 This is done using a lookup of the name returned by C<gethostname>. This option
315 is enabled by default.
317 =item B<PreCacheChain> I<ChainName>
319 =item B<PostCacheChain> I<ChainName>
321 Configure the name of the "pre-cache chain" and the "post-cache chain". Please
322 see L<FILTER CONFIGURATION> below on information on chains and how these
323 setting change the daemon's behavior.
327 =head1 PLUGIN OPTIONS
329 Some plugins may register own options. These options must be enclosed in a
330 C<Plugin>-Section. Which options exist depends on the plugin used. Some plugins
331 require external configuration, too. The C<apache plugin>, for example,
332 required C<mod_status> to be configured in the webserver you're going to
333 collect data from. These plugins are listed below as well, even if they don't
334 require any configuration within collectd's configuration file.
336 A list of all plugins and a short summary for each plugin can be found in the
337 F<README> file shipped with the sourcecode and hopefully binary packets as
340 =head2 Plugin C<aggregation>
342 The I<Aggregation plugin> makes it possible to aggregate several values into
343 one using aggregation functions such as I<sum>, I<average>, I<min> and I<max>.
344 This can be put to a wide variety of uses, e.g. average and total CPU
345 statistics for your entire fleet.
347 The grouping is powerful but, as with many powerful tools, may be a bit
348 difficult to wrap your head around. The grouping will therefore be
349 demonstrated using an example: The average and sum of the CPU usage across
350 all CPUs of each host is to be calculated.
352 To select all the affected values for our example, set C<Plugin cpu> and
353 C<Type cpu>. The other values are left unspecified, meaning "all values". The
354 I<Host>, I<Plugin>, I<PluginInstance>, I<Type> and I<TypeInstance> options
355 work as if they were specified in the C<WHERE> clause of an C<SELECT> SQL
361 Although the I<Host>, I<PluginInstance> (CPU number, i.e. 0, 1, 2, ...) and
362 I<TypeInstance> (idle, user, system, ...) fields are left unspecified in the
363 example, the intention is to have a new value for each host / type instance
364 pair. This is achieved by "grouping" the values using the C<GroupBy> option.
365 It can be specified multiple times to group by more than one field.
368 GroupBy "TypeInstance"
370 We do neither specify nor group by I<plugin instance> (the CPU number), so all
371 metrics that differ in the CPU number only will be aggregated. Each
372 aggregation needs I<at least one> such field, otherwise no aggregation would
375 The full example configuration looks like this:
377 <Plugin "aggregation">
383 GroupBy "TypeInstance"
386 CalculateAverage true
390 There are a couple of limitations you should be aware of:
396 The I<Type> cannot be left unspecified, because it is not reasonable to add
397 apples to oranges. Also, the internal lookup structure won't work if you try
402 There must be at least one unspecified, ungrouped field. Otherwise nothing
407 As you can see in the example above, each aggregation has its own
408 B<Aggregation> block. You can have multiple aggregation blocks and aggregation
409 blocks may match the same values, i.e. one value list can update multiple
410 aggregations. The following options are valid inside B<Aggregation> blocks:
414 =item B<Host> I<Host>
416 =item B<Plugin> I<Plugin>
418 =item B<PluginInstance> I<PluginInstance>
420 =item B<Type> I<Type>
422 =item B<TypeInstance> I<TypeInstance>
424 Selects the value lists to be added to this aggregation. B<Type> must be a
425 valid data set name, see L<types.db(5)> for details.
427 If the string starts with and ends with a slash (C</>), the string is
428 interpreted as a I<regular expression>. The regex flavor used are POSIX
429 extended regular expressions as described in L<regex(7)>. Example usage:
431 Host "/^db[0-9]\\.example\\.com$/"
433 =item B<GroupBy> B<Host>|B<Plugin>|B<PluginInstance>|B<TypeInstance>
435 Group valued by the specified field. The B<GroupBy> option may be repeated to
436 group by multiple fields.
438 =item B<SetHost> I<Host>
440 =item B<SetPlugin> I<Plugin>
442 =item B<SetPluginInstance> I<PluginInstance>
444 =item B<SetTypeInstance> I<TypeInstance>
446 Sets the appropriate part of the identifier to the provided string.
448 The I<PluginInstance> should include the placeholder C<%{aggregation}> which
449 will be replaced with the aggregation function, e.g. "average". Not including
450 the placeholder will result in duplication warnings and/or messed up values if
451 more than one aggregation function are enabled.
453 The following example calculates the average usage of all "even" CPUs:
455 <Plugin "aggregation">
458 PluginInstance "/[0,2,4,6,8]$/"
462 SetPluginInstance "even-%{aggregation}"
465 GroupBy "TypeInstance"
467 CalculateAverage true
471 This will create the files:
477 foo.example.com/cpu-even-average/cpu-idle
481 foo.example.com/cpu-even-average/cpu-system
485 foo.example.com/cpu-even-average/cpu-user
493 =item B<CalculateNum> B<true>|B<false>
495 =item B<CalculateSum> B<true>|B<false>
497 =item B<CalculateAverage> B<true>|B<false>
499 =item B<CalculateMinimum> B<true>|B<false>
501 =item B<CalculateMaximum> B<true>|B<false>
503 =item B<CalculateStddev> B<true>|B<false>
505 Boolean options for enabling calculation of the number of value lists, their
506 sum, average, minimum, maximum andE<nbsp>/ or standard deviation. All options
507 are disabled by default.
511 =head2 Plugin C<amqp>
513 The I<AMQP plugin> can be used to communicate with other instances of
514 I<collectd> or third party applications using an AMQP message broker. Values
515 are sent to or received from the broker, which handles routing, queueing and
516 possibly filtering out messages.
521 # Send values to an AMQP broker
522 <Publish "some_name">
528 Exchange "amq.fanout"
529 # ExchangeType "fanout"
530 # RoutingKey "collectd"
532 # ConnectionRetryDelay 0
535 # GraphitePrefix "collectd."
536 # GraphiteEscapeChar "_"
537 # GraphiteSeparateInstances false
538 # GraphiteAlwaysAppendDS false
541 # Receive values from an AMQP broker
542 <Subscribe "some_name">
548 Exchange "amq.fanout"
549 # ExchangeType "fanout"
552 # QueueAutoDelete true
553 # RoutingKey "collectd.#"
554 # ConnectionRetryDelay 0
558 The plugin's configuration consists of a number of I<Publish> and I<Subscribe>
559 blocks, which configure sending and receiving of values respectively. The two
560 blocks are very similar, so unless otherwise noted, an option can be used in
561 either block. The name given in the blocks starting tag is only used for
562 reporting messages, but may be used to support I<flushing> of certain
563 I<Publish> blocks in the future.
567 =item B<Host> I<Host>
569 Hostname or IP-address of the AMQP broker. Defaults to the default behavior of
570 the underlying communications library, I<rabbitmq-c>, which is "localhost".
572 =item B<Port> I<Port>
574 Service name or port number on which the AMQP broker accepts connections. This
575 argument must be a string, even if the numeric form is used. Defaults to
578 =item B<VHost> I<VHost>
580 Name of the I<virtual host> on the AMQP broker to use. Defaults to "/".
582 =item B<User> I<User>
584 =item B<Password> I<Password>
586 Credentials used to authenticate to the AMQP broker. By default "guest"/"guest"
589 =item B<Exchange> I<Exchange>
591 In I<Publish> blocks, this option specifies the I<exchange> to send values to.
592 By default, "amq.fanout" will be used.
594 In I<Subscribe> blocks this option is optional. If given, a I<binding> between
595 the given exchange and the I<queue> is created, using the I<routing key> if
596 configured. See the B<Queue> and B<RoutingKey> options below.
598 =item B<ExchangeType> I<Type>
600 If given, the plugin will try to create the configured I<exchange> with this
601 I<type> after connecting. When in a I<Subscribe> block, the I<queue> will then
602 be bound to this exchange.
604 =item B<Queue> I<Queue> (Subscribe only)
606 Configures the I<queue> name to subscribe to. If no queue name was configured
607 explicitly, a unique queue name will be created by the broker.
609 =item B<QueueDurable> B<true>|B<false> (Subscribe only)
611 Defines if the I<queue> subscribed to is durable (saved to persistent storage)
612 or transient (will disappear if the AMQP broker is restarted). Defaults to
615 This option should be used in conjunction with the I<Persistent> option on the
618 =item B<QueueAutoDelete> B<true>|B<false> (Subscribe only)
620 Defines if the I<queue> subscribed to will be deleted once the last consumer
621 unsubscribes. Defaults to "true".
623 =item B<RoutingKey> I<Key>
625 In I<Publish> blocks, this configures the routing key to set on all outgoing
626 messages. If not given, the routing key will be computed from the I<identifier>
627 of the value. The host, plugin, type and the two instances are concatenated
628 together using dots as the separator and all containing dots replaced with
629 slashes. For example "collectd.host/example/com.cpu.0.cpu.user". This makes it
630 possible to receive only specific values using a "topic" exchange.
632 In I<Subscribe> blocks, configures the I<routing key> used when creating a
633 I<binding> between an I<exchange> and the I<queue>. The usual wildcards can be
634 used to filter messages when using a "topic" exchange. If you're only
635 interested in CPU statistics, you could use the routing key "collectd.*.cpu.#"
638 =item B<Persistent> B<true>|B<false> (Publish only)
640 Selects the I<delivery method> to use. If set to B<true>, the I<persistent>
641 mode will be used, i.e. delivery is guaranteed. If set to B<false> (the
642 default), the I<transient> delivery mode will be used, i.e. messages may be
643 lost due to high load, overflowing queues or similar issues.
645 =item B<ConnectionRetryDelay> I<Delay>
647 When the connection to the AMQP broker is lost, defines the time in seconds to
648 wait before attempting to reconnect. Defaults to 0, which implies collectd will
649 attempt to reconnect at each read interval (in Subscribe mode) or each time
650 values are ready for submission (in Publish mode).
652 =item B<Format> B<Command>|B<JSON>|B<Graphite> (Publish only)
654 Selects the format in which messages are sent to the broker. If set to
655 B<Command> (the default), values are sent as C<PUTVAL> commands which are
656 identical to the syntax used by the I<Exec> and I<UnixSock plugins>. In this
657 case, the C<Content-Type> header field will be set to C<text/collectd>.
659 If set to B<JSON>, the values are encoded in the I<JavaScript Object Notation>,
660 an easy and straight forward exchange format. The C<Content-Type> header field
661 will be set to C<application/json>.
663 If set to B<Graphite>, values are encoded in the I<Graphite> format, which is
664 "<metric> <value> <timestamp>\n". The C<Content-Type> header field will be set to
667 A subscribing client I<should> use the C<Content-Type> header field to
668 determine how to decode the values. Currently, the I<AMQP plugin> itself can
669 only decode the B<Command> format.
671 =item B<StoreRates> B<true>|B<false> (Publish only)
673 Determines whether or not C<COUNTER>, C<DERIVE> and C<ABSOLUTE> data sources
674 are converted to a I<rate> (i.e. a C<GAUGE> value). If set to B<false> (the
675 default), no conversion is performed. Otherwise the conversion is performed
676 using the internal value cache.
678 Please note that currently this option is only used if the B<Format> option has
681 =item B<GraphitePrefix> (Publish and B<Format>=I<Graphite> only)
683 A prefix can be added in the metric name when outputting in the I<Graphite> format.
684 It's added before the I<Host> name.
685 Metric name will be "<prefix><host><postfix><plugin><type><name>"
687 =item B<GraphitePostfix> (Publish and B<Format>=I<Graphite> only)
689 A postfix can be added in the metric name when outputting in the I<Graphite> format.
690 It's added after the I<Host> name.
691 Metric name will be "<prefix><host><postfix><plugin><type><name>"
693 =item B<GraphiteEscapeChar> (Publish and B<Format>=I<Graphite> only)
695 Specify a character to replace dots (.) in the host part of the metric name.
696 In I<Graphite> metric name, dots are used as separators between different
697 metric parts (host, plugin, type).
698 Default is "_" (I<Underscore>).
700 =item B<GraphiteSeparateInstances> B<true>|B<false>
702 If set to B<true>, the plugin instance and type instance will be in their own
703 path component, for example C<host.cpu.0.cpu.idle>. If set to B<false> (the
704 default), the plugin and plugin instance (and likewise the type and type
705 instance) are put into one component, for example C<host.cpu-0.cpu-idle>.
707 =item B<GraphiteAlwaysAppendDS> B<true>|B<false>
709 If set to B<true>, append the name of the I<Data Source> (DS) to the "metric"
710 identifier. If set to B<false> (the default), this is only done when there is
715 =head2 Plugin C<apache>
717 To configure the C<apache>-plugin you first need to configure the Apache
718 webserver correctly. The Apache-plugin C<mod_status> needs to be loaded and
719 working and the C<ExtendedStatus> directive needs to be B<enabled>. You can use
720 the following snipped to base your Apache config upon:
723 <IfModule mod_status.c>
724 <Location /mod_status>
725 SetHandler server-status
729 Since its C<mod_status> module is very similar to Apache's, B<lighttpd> is
730 also supported. It introduces a new field, called C<BusyServers>, to count the
731 number of currently connected clients. This field is also supported.
733 The configuration of the I<Apache> plugin consists of one or more
734 C<E<lt>InstanceE<nbsp>/E<gt>> blocks. Each block requires one string argument
735 as the instance name. For example:
739 URL "http://www1.example.com/mod_status?auto"
742 URL "http://www2.example.com/mod_status?auto"
746 The instance name will be used as the I<plugin instance>. To emulate the old
747 (versionE<nbsp>4) behavior, you can use an empty string (""). In order for the
748 plugin to work correctly, each instance name must be unique. This is not
749 enforced by the plugin and it is your responsibility to ensure it.
751 The following options are accepted within each I<Instance> block:
755 =item B<URL> I<http://host/mod_status?auto>
757 Sets the URL of the C<mod_status> output. This needs to be the output generated
758 by C<ExtendedStatus on> and it needs to be the machine readable output
759 generated by appending the C<?auto> argument. This option is I<mandatory>.
761 =item B<User> I<Username>
763 Optional user name needed for authentication.
765 =item B<Password> I<Password>
767 Optional password needed for authentication.
769 =item B<VerifyPeer> B<true|false>
771 Enable or disable peer SSL certificate verification. See
772 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
774 =item B<VerifyHost> B<true|false>
776 Enable or disable peer host name verification. If enabled, the plugin checks
777 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
778 certificate matches the host name provided by the B<URL> option. If this
779 identity check fails, the connection is aborted. Obviously, only works when
780 connecting to a SSL enabled server. Enabled by default.
782 =item B<CACert> I<File>
784 File that holds one or more SSL certificates. If you want to use HTTPS you will
785 possibly need this option. What CA certificates come bundled with C<libcurl>
786 and are checked by default depends on the distribution you use.
788 =item B<SSLCiphers> I<list of ciphers>
790 Specifies which ciphers to use in the connection. The list of ciphers
791 must specify valid ciphers. See
792 L<http://www.openssl.org/docs/apps/ciphers.html> for details.
794 =item B<Timeout> I<Milliseconds>
796 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
797 milliseconds. By default, the configured B<Interval> is used to set the
802 =head2 Plugin C<apcups>
806 =item B<Host> I<Hostname>
808 Hostname of the host running B<apcupsd>. Defaults to B<localhost>. Please note
809 that IPv6 support has been disabled unless someone can confirm or decline that
810 B<apcupsd> can handle it.
812 =item B<Port> I<Port>
814 TCP-Port to connect to. Defaults to B<3551>.
816 =item B<ReportSeconds> B<true>|B<false>
818 If set to B<true>, the time reported in the C<timeleft> metric will be
819 converted to seconds. This is the recommended setting. If set to B<false>, the
820 default for backwards compatibility, the time will be reported in minutes.
822 =item B<PersistentConnection> B<true>|B<false>
824 By default, the plugin will try to keep the connection to UPS open between
825 reads. Since this appears to be somewhat brittle (I<apcupsd> appears to close
826 the connection due to inactivity quite quickly), the plugin will try to detect
827 this problem and switch to an open-read-close mode in such cases.
829 You can instruct the plugin to close the connection after each read by setting
830 this option to B<false>.
834 =head2 Plugin C<aquaero>
836 This plugin collects the value of the available sensors in an
837 I<AquaeroE<nbsp>5> board. AquaeroE<nbsp>5 is a water-cooling controller board,
838 manufactured by Aqua Computer GmbH L<http://www.aquacomputer.de/>, with a USB2
839 connection for monitoring and configuration. The board can handle multiple
840 temperature sensors, fans, water pumps and water level sensors and adjust the
841 output settings such as fan voltage or power used by the water pump based on
842 the available inputs using a configurable controller included in the board.
843 This plugin collects all the available inputs as well as some of the output
844 values chosen by this controller. The plugin is based on the I<libaquaero5>
845 library provided by I<aquatools-ng>.
849 =item B<Device> I<DevicePath>
851 Device path of the AquaeroE<nbsp>5's USB HID (human interface device), usually
852 in the form C</dev/usb/hiddevX>. If this option is no set the plugin will try
853 to auto-detect the Aquaero 5 USB device based on vendor-ID and product-ID.
857 =head2 Plugin C<ascent>
859 This plugin collects information about an Ascent server, a free server for the
860 "World of Warcraft" game. This plugin gathers the information by fetching the
861 XML status page using C<libcurl> and parses it using C<libxml2>.
863 The configuration options are the same as for the C<apache> plugin above:
867 =item B<URL> I<http://localhost/ascent/status/>
869 Sets the URL of the XML status output.
871 =item B<User> I<Username>
873 Optional user name needed for authentication.
875 =item B<Password> I<Password>
877 Optional password needed for authentication.
879 =item B<VerifyPeer> B<true|false>
881 Enable or disable peer SSL certificate verification. See
882 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
884 =item B<VerifyHost> B<true|false>
886 Enable or disable peer host name verification. If enabled, the plugin checks
887 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
888 certificate matches the host name provided by the B<URL> option. If this
889 identity check fails, the connection is aborted. Obviously, only works when
890 connecting to a SSL enabled server. Enabled by default.
892 =item B<CACert> I<File>
894 File that holds one or more SSL certificates. If you want to use HTTPS you will
895 possibly need this option. What CA certificates come bundled with C<libcurl>
896 and are checked by default depends on the distribution you use.
898 =item B<Timeout> I<Milliseconds>
900 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
901 milliseconds. By default, the configured B<Interval> is used to set the
906 =head2 Plugin C<barometer>
908 This plugin reads absolute air pressure using digital barometer sensor on a I2C
909 bus. Supported sensors are:
913 =item I<MPL115A2> from Freescale,
914 see L<http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPL115A>.
917 =item I<MPL3115> from Freescale
918 see L<http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPL3115A2>.
921 =item I<BMP085> from Bosch Sensortec
925 The sensor type - one of the above - is detected automatically by the plugin
926 and indicated in the plugin_instance (you will see subdirectory
927 "barometer-mpl115" or "barometer-mpl3115", or "barometer-bmp085"). The order of
928 detection is BMP085 -> MPL3115 -> MPL115A2, the first one found will be used
929 (only one sensor can be used by the plugin).
931 The plugin provides absolute barometric pressure, air pressure reduced to sea
932 level (several possible approximations) and as an auxiliary value also internal
933 sensor temperature. It uses (expects/provides) typical metric units - pressure
934 in [hPa], temperature in [C], altitude in [m].
936 It was developed and tested under Linux only. The only platform dependency is
937 the standard Linux i2c-dev interface (the particular bus driver has to
938 support the SM Bus command subset).
940 The reduction or normalization to mean sea level pressure requires (depending
941 on selected method/approximation) also altitude and reference to temperature
942 sensor(s). When multiple temperature sensors are configured the minumum of
943 their values is always used (expecting that the warmer ones are affected by
944 e.g. direct sun light at that moment).
952 TemperatureOffset 0.0
955 TemperatureSensor "myserver/onewire-F10FCA000800/temperature"
960 =item B<Device> I<device>
962 The only mandatory configuration parameter.
964 Device name of the I2C bus to which the sensor is connected. Note that
965 typically you need to have loaded the i2c-dev module.
966 Using i2c-tools you can check/list i2c buses available on your system by:
970 Then you can scan for devices on given bus. E.g. to scan the whole bus 0 use:
974 This way you should be able to verify that the pressure sensor (either type) is
975 connected and detected on address 0x60.
977 =item B<Oversampling> I<value>
979 Optional parameter controlling the oversampling/accuracy. Default value
980 is 1 providing fastest and least accurate reading.
982 For I<MPL115> this is the size of the averaging window. To filter out sensor
983 noise a simple averaging using floating window of this configurable size is
984 used. The plugin will use average of the last C<value> measurements (value of 1
985 means no averaging). Minimal size is 1, maximal 1024.
987 For I<MPL3115> this is the oversampling value. The actual oversampling is
988 performed by the sensor and the higher value the higher accuracy and longer
989 conversion time (although nothing to worry about in the collectd context).
990 Supported values are: 1, 2, 4, 8, 16, 32, 64 and 128. Any other value is
991 adjusted by the plugin to the closest supported one.
993 For I<BMP085> this is the oversampling value. The actual oversampling is
994 performed by the sensor and the higher value the higher accuracy and longer
995 conversion time (although nothing to worry about in the collectd context).
996 Supported values are: 1, 2, 4, 8. Any other value is adjusted by the plugin to
997 the closest supported one.
999 =item B<PressureOffset> I<offset>
1001 Optional parameter for MPL3115 only.
1003 You can further calibrate the sensor by supplying pressure and/or temperature
1004 offsets. This is added to the measured/caclulated value (i.e. if the measured
1005 value is too high then use negative offset).
1006 In hPa, default is 0.0.
1008 =item B<TemperatureOffset> I<offset>
1010 Optional parameter for MPL3115 only.
1012 You can further calibrate the sensor by supplying pressure and/or temperature
1013 offsets. This is added to the measured/caclulated value (i.e. if the measured
1014 value is too high then use negative offset).
1015 In C, default is 0.0.
1017 =item B<Normalization> I<method>
1019 Optional parameter, default value is 0.
1021 Normalization method - what approximation/model is used to compute the mean sea
1022 level pressure from the air absolute pressure.
1024 Supported values of the C<method> (integer between from 0 to 2) are:
1028 =item B<0> - no conversion, absolute pressure is simply copied over. For this method you
1029 do not need to configure C<Altitude> or C<TemperatureSensor>.
1031 =item B<1> - international formula for conversion ,
1033 L<http://en.wikipedia.org/wiki/Atmospheric_pressure#Altitude_atmospheric_pressure_variation>.
1034 For this method you have to configure C<Altitude> but do not need
1035 C<TemperatureSensor> (uses fixed global temperature average instead).
1037 =item B<2> - formula as recommended by the Deutsche Wetterdienst (German
1038 Meteorological Service).
1039 See L<http://de.wikipedia.org/wiki/Barometrische_H%C3%B6henformel#Theorie>
1040 For this method you have to configure both C<Altitude> and
1041 C<TemperatureSensor>.
1046 =item B<Altitude> I<altitude>
1048 The altitude (in meters) of the location where you meassure the pressure.
1050 =item B<TemperatureSensor> I<reference>
1052 Temperature sensor(s) which should be used as a reference when normalizing the
1053 pressure using C<Normalization> method 2.
1054 When specified more sensors a minumum is found and used each time. The
1055 temperature reading directly from this pressure sensor/plugin is typically not
1056 suitable as the pressure sensor will be probably inside while we want outside
1057 temperature. The collectd reference name is something like
1058 <hostname>/<plugin_name>-<plugin_instance>/<type>-<type_instance>
1059 (<type_instance> is usually omitted when there is just single value type). Or
1060 you can figure it out from the path of the output data files.
1064 =head2 Plugin C<battery>
1066 The I<battery plugin> reports the remaining capacity, power and voltage of
1071 =item B<ValuesPercentage> B<false>|B<true>
1073 When enabled, remaining capacity is reported as a percentage, e.g. "42%
1074 capacity remaining". Otherwise the capacity is stored as reported by the
1075 battery, most likely in "Wh". This option does not work with all input methods,
1076 in particular when only C</proc/pmu> is available on an old Linux system.
1077 Defaults to B<false>.
1079 =item B<ReportDegraded> B<false>|B<true>
1081 Typical laptop batteries degrade over time, meaning the capacity decreases with
1082 recharge cycles. The maximum charge of the previous charge cycle is tracked as
1083 "last full capacity" and used to determine that a battery is "fully charged".
1085 When this option is set to B<false>, the default, the I<battery plugin> will
1086 only report the remaining capacity. If the B<ValuesPercentage> option is
1087 enabled, the relative remaining capacity is calculated as the ratio of the
1088 "remaining capacity" and the "last full capacity". This is what most tools,
1089 such as the status bar of desktop environments, also do.
1091 When set to B<true>, the battery plugin will report three values: B<charged>
1092 (remaining capacity), B<discharged> (difference between "last full capacity"
1093 and "remaining capacity") and B<degraded> (difference between "design capacity"
1094 and "last full capacity").
1098 =head2 Plugin C<bind>
1100 Starting with BIND 9.5.0, the most widely used DNS server software provides
1101 extensive statistics about queries, responses and lots of other information.
1102 The bind plugin retrieves this information that's encoded in XML and provided
1103 via HTTP and submits the values to collectd.
1105 To use this plugin, you first need to tell BIND to make this information
1106 available. This is done with the C<statistics-channels> configuration option:
1108 statistics-channels {
1109 inet localhost port 8053;
1112 The configuration follows the grouping that can be seen when looking at the
1113 data with an XSLT compatible viewer, such as a modern web browser. It's
1114 probably a good idea to make yourself familiar with the provided values, so you
1115 can understand what the collected statistics actually mean.
1120 URL "http://localhost:8053/"
1135 Zone "127.in-addr.arpa/IN"
1139 The bind plugin accepts the following configuration options:
1145 URL from which to retrieve the XML data. If not specified,
1146 C<http://localhost:8053/> will be used.
1148 =item B<ParseTime> B<true>|B<false>
1150 When set to B<true>, the time provided by BIND will be parsed and used to
1151 dispatch the values. When set to B<false>, the local time source is queried.
1153 This setting is set to B<true> by default for backwards compatibility; setting
1154 this to B<false> is I<recommended> to avoid problems with timezones and
1157 =item B<OpCodes> B<true>|B<false>
1159 When enabled, statistics about the I<"OpCodes">, for example the number of
1160 C<QUERY> packets, are collected.
1164 =item B<QTypes> B<true>|B<false>
1166 When enabled, the number of I<incoming> queries by query types (for example
1167 C<A>, C<MX>, C<AAAA>) is collected.
1171 =item B<ServerStats> B<true>|B<false>
1173 Collect global server statistics, such as requests received over IPv4 and IPv6,
1174 successful queries, and failed updates.
1178 =item B<ZoneMaintStats> B<true>|B<false>
1180 Collect zone maintenance statistics, mostly information about notifications
1181 (zone updates) and zone transfers.
1185 =item B<ResolverStats> B<true>|B<false>
1187 Collect resolver statistics, i.E<nbsp>e. statistics about outgoing requests
1188 (e.E<nbsp>g. queries over IPv4, lame servers). Since the global resolver
1189 counters apparently were removed in BIND 9.5.1 and 9.6.0, this is disabled by
1190 default. Use the B<ResolverStats> option within a B<View "_default"> block
1191 instead for the same functionality.
1195 =item B<MemoryStats>
1197 Collect global memory statistics.
1201 =item B<Timeout> I<Milliseconds>
1203 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
1204 milliseconds. By default, the configured B<Interval> is used to set the
1207 =item B<View> I<Name>
1209 Collect statistics about a specific I<"view">. BIND can behave different,
1210 mostly depending on the source IP-address of the request. These different
1211 configurations are called "views". If you don't use this feature, you most
1212 likely are only interested in the C<_default> view.
1214 Within a E<lt>B<View>E<nbsp>I<name>E<gt> block, you can specify which
1215 information you want to collect about a view. If no B<View> block is
1216 configured, no detailed view statistics will be collected.
1220 =item B<QTypes> B<true>|B<false>
1222 If enabled, the number of I<outgoing> queries by query type (e.E<nbsp>g. C<A>,
1223 C<MX>) is collected.
1227 =item B<ResolverStats> B<true>|B<false>
1229 Collect resolver statistics, i.E<nbsp>e. statistics about outgoing requests
1230 (e.E<nbsp>g. queries over IPv4, lame servers).
1234 =item B<CacheRRSets> B<true>|B<false>
1236 If enabled, the number of entries (I<"RR sets">) in the view's cache by query
1237 type is collected. Negative entries (queries which resulted in an error, for
1238 example names that do not exist) are reported with a leading exclamation mark,
1243 =item B<Zone> I<Name>
1245 When given, collect detailed information about the given zone in the view. The
1246 information collected if very similar to the global B<ServerStats> information
1249 You can repeat this option to collect detailed information about multiple
1252 By default no detailed zone information is collected.
1258 =head2 Plugin C<ceph>
1260 The ceph plugin collects values from JSON data to be parsed by B<libyajl>
1261 (L<https://lloyd.github.io/yajl/>) retrieved from ceph daemon admin sockets.
1263 A separate B<Daemon> block must be configured for each ceph daemon to be
1264 monitored. The following example will read daemon statistics from four
1265 separate ceph daemons running on the same device (two OSDs, one MON, one MDS) :
1268 LongRunAvgLatency false
1269 ConvertSpecialMetricTypes true
1271 SocketPath "/var/run/ceph/ceph-osd.0.asok"
1274 SocketPath "/var/run/ceph/ceph-osd.1.asok"
1277 SocketPath "/var/run/ceph/ceph-mon.ceph1.asok"
1280 SocketPath "/var/run/ceph/ceph-mds.ceph1.asok"
1284 The ceph plugin accepts the following configuration options:
1288 =item B<LongRunAvgLatency> B<true>|B<false>
1290 If enabled, latency values(sum,count pairs) are calculated as the long run
1291 average - average since the ceph daemon was started = (sum / count).
1292 When disabled, latency values are calculated as the average since the last
1293 collection = (sum_now - sum_last) / (count_now - count_last).
1297 =item B<ConvertSpecialMetricTypes> B<true>|B<false>
1299 If enabled, special metrics (metrics that differ in type from similar counters)
1300 are converted to the type of those similar counters. This currently only
1301 applies to filestore.journal_wr_bytes which is a counter for OSD daemons. The
1302 ceph schema reports this metric type as a sum,count pair while similar counters
1303 are treated as derive types. When converted, the sum is used as the counter
1304 value and is treated as a derive type.
1305 When disabled, all metrics are treated as the types received from the ceph schema.
1311 Each B<Daemon> block must have a string argument for the plugin instance name.
1312 A B<SocketPath> is also required for each B<Daemon> block:
1316 =item B<Daemon> I<DaemonName>
1318 Name to be used as the instance name for this daemon.
1320 =item B<SocketPath> I<SocketPath>
1322 Specifies the path to the UNIX admin socket of the ceph daemon.
1326 =head2 Plugin C<cgroups>
1328 This plugin collects the CPU user/system time for each I<cgroup> by reading the
1329 F<cpuacct.stat> files in the first cpuacct-mountpoint (typically
1330 F</sys/fs/cgroup/cpu.cpuacct> on machines using systemd).
1334 =item B<CGroup> I<Directory>
1336 Select I<cgroup> based on the name. Whether only matching I<cgroups> are
1337 collected or if they are ignored is controlled by the B<IgnoreSelected> option;
1340 =item B<IgnoreSelected> B<true>|B<false>
1342 Invert the selection: If set to true, all cgroups I<except> the ones that
1343 match any one of the criteria are collected. By default only selected
1344 cgroups are collected if a selection is made. If no selection is configured
1345 at all, B<all> cgroups are selected.
1349 =head2 Plugin C<conntrack>
1351 This plugin collects IP conntrack statistics.
1357 Assume the B<conntrack_count> and B<conntrack_max> files to be found in
1358 F</proc/sys/net/ipv4/netfilter> instead of F</proc/sys/net/netfilter/>.
1362 =head2 Plugin C<cpu>
1364 The I<CPU plugin> collects CPU usage metrics. By default, CPU usage is reported
1365 as Jiffies, using the C<cpu> type. Two aggregations are available:
1371 Sum, per-state, over all CPUs installed in the system; and
1375 Sum, per-CPU, over all non-idle states of a CPU, creating an "active" state.
1379 The two aggregations can be combined, leading to I<collectd> only emitting a
1380 single "active" metric for the entire system. As soon as one of these
1381 aggregations (or both) is enabled, the I<cpu plugin> will report a percentage,
1382 rather than Jiffies. In addition, you can request individual, per-state,
1383 per-CPU metrics to be reported as percentage.
1385 The following configuration options are available:
1389 =item B<ReportByState> B<true>|B<false>
1391 When set to B<true>, the default, reports per-state metrics, e.g. "system",
1393 When set to B<false>, aggregates (sums) all I<non-idle> states into one
1396 =item B<ReportByCpu> B<true>|B<false>
1398 When set to B<true>, the default, reports per-CPU (per-core) metrics.
1399 When set to B<false>, instead of reporting metrics for individual CPUs, only a
1400 global sum of CPU states is emitted.
1402 =item B<ValuesPercentage> B<false>|B<true>
1404 This option is only considered when both, B<ReportByCpu> and B<ReportByState>
1405 are set to B<true>. In this case, by default, metrics will be reported as
1406 Jiffies. By setting this option to B<true>, you can request percentage values
1407 in the un-aggregated (per-CPU, per-state) mode as well.
1411 =head2 Plugin C<cpufreq>
1413 This plugin doesn't have any options. It reads
1414 F</sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq> (for the first CPU
1415 installed) to get the current CPU frequency. If this file does not exist make
1416 sure B<cpufreqd> (L<http://cpufreqd.sourceforge.net/>) or a similar tool is
1417 installed and an "cpu governor" (that's a kernel module) is loaded.
1419 =head2 Plugin C<csv>
1423 =item B<DataDir> I<Directory>
1425 Set the directory to store CSV-files under. Per default CSV-files are generated
1426 beneath the daemon's working directory, i.E<nbsp>e. the B<BaseDir>.
1427 The special strings B<stdout> and B<stderr> can be used to write to the standard
1428 output and standard error channels, respectively. This, of course, only makes
1429 much sense when collectd is running in foreground- or non-daemon-mode.
1431 =item B<StoreRates> B<true|false>
1433 If set to B<true>, convert counter values to rates. If set to B<false> (the
1434 default) counter values are stored as is, i.E<nbsp>e. as an increasing integer
1439 =head2 Plugin C<curl>
1441 The curl plugin uses the B<libcurl> (L<http://curl.haxx.se/>) to read web pages
1442 and the match infrastructure (the same code used by the tail plugin) to use
1443 regular expressions with the received data.
1445 The following example will read the current value of AMD stock from Google's
1446 finance page and dispatch the value to collectd.
1449 <Page "stock_quotes">
1450 URL "http://finance.google.com/finance?q=NYSE%3AAMD"
1456 CACert "/path/to/ca.crt"
1457 Header "X-Custom-Header: foobar"
1460 MeasureResponseTime false
1461 MeasureResponseCode false
1464 Regex "<span +class=\"pr\"[^>]*> *([0-9]*\\.[0-9]+) *</span>"
1465 DSType "GaugeAverage"
1466 # Note: `stock_value' is not a standard type.
1473 In the B<Plugin> block, there may be one or more B<Page> blocks, each defining
1474 a web page and one or more "matches" to be performed on the returned data. The
1475 string argument to the B<Page> block is used as plugin instance.
1477 The following options are valid within B<Page> blocks:
1483 URL of the web site to retrieve. Since a regular expression will be used to
1484 extract information from this data, non-binary data is a big plus here ;)
1486 =item B<User> I<Name>
1488 Username to use if authorization is required to read the page.
1490 =item B<Password> I<Password>
1492 Password to use if authorization is required to read the page.
1494 =item B<Digest> B<true>|B<false>
1496 Enable HTTP digest authentication.
1498 =item B<VerifyPeer> B<true>|B<false>
1500 Enable or disable peer SSL certificate verification. See
1501 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
1503 =item B<VerifyHost> B<true>|B<false>
1505 Enable or disable peer host name verification. If enabled, the plugin checks if
1506 the C<Common Name> or a C<Subject Alternate Name> field of the SSL certificate
1507 matches the host name provided by the B<URL> option. If this identity check
1508 fails, the connection is aborted. Obviously, only works when connecting to a
1509 SSL enabled server. Enabled by default.
1511 =item B<CACert> I<file>
1513 File that holds one or more SSL certificates. If you want to use HTTPS you will
1514 possibly need this option. What CA certificates come bundled with C<libcurl>
1515 and are checked by default depends on the distribution you use.
1517 =item B<Header> I<Header>
1519 A HTTP header to add to the request. Multiple headers are added if this option
1520 is specified more than once.
1522 =item B<Post> I<Body>
1524 Specifies that the HTTP operation should be a POST instead of a GET. The
1525 complete data to be posted is given as the argument. This option will usually
1526 need to be accompanied by a B<Header> option to set an appropriate
1527 C<Content-Type> for the post body (e.g. to
1528 C<application/x-www-form-urlencoded>).
1530 =item B<MeasureResponseTime> B<true>|B<false>
1532 Measure response time for the request. If this setting is enabled, B<Match>
1533 blocks (see below) are optional. Disabled by default.
1535 Beware that requests will get aborted if they take too long to complete. Adjust
1536 B<Timeout> accordingly if you expect B<MeasureResponseTime> to report such slow
1539 =item B<MeasureResponseCode> B<true>|B<false>
1541 Measure response code for the request. If this setting is enabled, B<Match>
1542 blocks (see below) are optional. Disabled by default.
1544 =item B<E<lt>MatchE<gt>>
1546 One or more B<Match> blocks that define how to match information in the data
1547 returned by C<libcurl>. The C<curl> plugin uses the same infrastructure that's
1548 used by the C<tail> plugin, so please see the documentation of the C<tail>
1549 plugin below on how matches are defined. If the B<MeasureResponseTime> or
1550 B<MeasureResponseCode> options are set to B<true>, B<Match> blocks are
1553 =item B<Timeout> I<Milliseconds>
1555 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
1556 milliseconds. By default, the configured B<Interval> is used to set the
1557 timeout. Prior to version 5.5.0, there was no timeout and requests could hang
1558 indefinitely. This legacy behaviour can be achieved by setting the value of
1561 If B<Timeout> is 0 or bigger than the B<Interval>, keep in mind that each slow
1562 network connection will stall one read thread. Adjust the B<ReadThreads> global
1563 setting accordingly to prevent this from blocking other plugins.
1567 =head2 Plugin C<curl_json>
1569 The B<curl_json plugin> collects values from JSON data to be parsed by
1570 B<libyajl> (L<https://lloyd.github.io/yajl/>) retrieved via
1571 either B<libcurl> (L<http://curl.haxx.se/>) or read directly from a
1572 unix socket. The former can be used, for example, to collect values
1573 from CouchDB documents (which are stored JSON notation), and the
1574 latter to collect values from a uWSGI stats socket.
1576 The following example will collect several values from the built-in
1577 C<_stats> runtime statistics module of I<CouchDB>
1578 (L<http://wiki.apache.org/couchdb/Runtime_Statistics>).
1581 <URL "http://localhost:5984/_stats">
1583 <Key "httpd/requests/count">
1584 Type "http_requests"
1587 <Key "httpd_request_methods/*/count">
1588 Type "http_request_methods"
1591 <Key "httpd_status_codes/*/count">
1592 Type "http_response_codes"
1597 This example will collect data directly from a I<uWSGI> "Stats Server" socket.
1600 <Sock "/var/run/uwsgi.stats.sock">
1602 <Key "workers/*/requests">
1603 Type "http_requests"
1606 <Key "workers/*/apps/*/requests">
1607 Type "http_requests"
1612 In the B<Plugin> block, there may be one or more B<URL> blocks, each
1613 defining a URL to be fetched via HTTP (using libcurl) or B<Sock>
1614 blocks defining a unix socket to read JSON from directly. Each of
1615 these blocks may have one or more B<Key> blocks.
1617 The B<Key> string argument must be in a path format. Each component is
1618 used to match the key from a JSON map or the index of an JSON
1619 array. If a path component of a B<Key> is a I<*>E<nbsp>wildcard, the
1620 values for all map keys or array indices will be collectd.
1622 The following options are valid within B<URL> blocks:
1626 =item B<Instance> I<Instance>
1628 Sets the plugin instance to I<Instance>.
1630 =item B<Interval> I<Interval>
1632 Sets the interval (in seconds) in which the values will be collected from this
1633 URL. By default the global B<Interval> setting will be used.
1635 =item B<User> I<Name>
1637 =item B<Password> I<Password>
1639 =item B<Digest> B<true>|B<false>
1641 =item B<VerifyPeer> B<true>|B<false>
1643 =item B<VerifyHost> B<true>|B<false>
1645 =item B<CACert> I<file>
1647 =item B<Header> I<Header>
1649 =item B<Post> I<Body>
1651 =item B<Timeout> I<Milliseconds>
1653 These options behave exactly equivalent to the appropriate options of the
1654 I<cURL> plugin. Please see there for a detailed description.
1658 The following options are valid within B<Key> blocks:
1662 =item B<Type> I<Type>
1664 Sets the type used to dispatch the values to the daemon. Detailed information
1665 about types and their configuration can be found in L<types.db(5)>. This
1666 option is mandatory.
1668 =item B<Instance> I<Instance>
1670 Type-instance to use. Defaults to the current map key or current string array element value.
1674 =head2 Plugin C<curl_xml>
1676 The B<curl_xml plugin> uses B<libcurl> (L<http://curl.haxx.se/>) and B<libxml2>
1677 (L<http://xmlsoft.org/>) to retrieve XML data via cURL.
1680 <URL "http://localhost/stats.xml">
1682 Instance "some_instance"
1687 CACert "/path/to/ca.crt"
1688 Header "X-Custom-Header: foobar"
1691 <XPath "table[@id=\"magic_level\"]/tr">
1693 #InstancePrefix "prefix-"
1694 InstanceFrom "td[1]"
1695 ValuesFrom "td[2]/span[@class=\"level\"]"
1700 In the B<Plugin> block, there may be one or more B<URL> blocks, each defining a
1701 URL to be fetched using libcurl. Within each B<URL> block there are
1702 options which specify the connection parameters, for example authentication
1703 information, and one or more B<XPath> blocks.
1705 Each B<XPath> block specifies how to get one type of information. The
1706 string argument must be a valid XPath expression which returns a list
1707 of "base elements". One value is dispatched for each "base element". The
1708 I<type instance> and values are looked up using further I<XPath> expressions
1709 that should be relative to the base element.
1711 Within the B<URL> block the following options are accepted:
1715 =item B<Host> I<Name>
1717 Use I<Name> as the host name when submitting values. Defaults to the global
1720 =item B<Instance> I<Instance>
1722 Use I<Instance> as the plugin instance when submitting values. Defaults to an
1723 empty string (no plugin instance).
1725 =item B<Namespace> I<Prefix> I<URL>
1727 If an XPath expression references namespaces, they must be specified
1728 with this option. I<Prefix> is the "namespace prefix" used in the XML document.
1729 I<URL> is the "namespace name", an URI reference uniquely identifying the
1730 namespace. The option can be repeated to register multiple namespaces.
1734 Namespace "s" "http://schemas.xmlsoap.org/soap/envelope/"
1735 Namespace "m" "http://www.w3.org/1998/Math/MathML"
1737 =item B<User> I<User>
1739 =item B<Password> I<Password>
1741 =item B<Digest> B<true>|B<false>
1743 =item B<VerifyPeer> B<true>|B<false>
1745 =item B<VerifyHost> B<true>|B<false>
1747 =item B<CACert> I<CA Cert File>
1749 =item B<Header> I<Header>
1751 =item B<Post> I<Body>
1753 =item B<Timeout> I<Milliseconds>
1755 These options behave exactly equivalent to the appropriate options of the
1756 I<cURL plugin>. Please see there for a detailed description.
1758 =item E<lt>B<XPath> I<XPath-expression>E<gt>
1760 Within each B<URL> block, there must be one or more B<XPath> blocks. Each
1761 B<XPath> block specifies how to get one type of information. The string
1762 argument must be a valid XPath expression which returns a list of "base
1763 elements". One value is dispatched for each "base element".
1765 Within the B<XPath> block the following options are accepted:
1769 =item B<Type> I<Type>
1771 Specifies the I<Type> used for submitting patches. This determines the number
1772 of values that are required / expected and whether the strings are parsed as
1773 signed or unsigned integer or as double values. See L<types.db(5)> for details.
1774 This option is required.
1776 =item B<InstancePrefix> I<InstancePrefix>
1778 Prefix the I<type instance> with I<InstancePrefix>. The values are simply
1779 concatenated together without any separator.
1780 This option is optional.
1782 =item B<InstanceFrom> I<InstanceFrom>
1784 Specifies a XPath expression to use for determining the I<type instance>. The
1785 XPath expression must return exactly one element. The element's value is then
1786 used as I<type instance>, possibly prefixed with I<InstancePrefix> (see above).
1788 This value is required. As a special exception, if the "base XPath expression"
1789 (the argument to the B<XPath> block) returns exactly one argument, then this
1790 option may be omitted.
1792 =item B<ValuesFrom> I<ValuesFrom> [I<ValuesFrom> ...]
1794 Specifies one or more XPath expression to use for reading the values. The
1795 number of XPath expressions must match the number of data sources in the
1796 I<type> specified with B<Type> (see above). Each XPath expression must return
1797 exactly one element. The element's value is then parsed as a number and used as
1798 value for the appropriate value in the value list dispatched to the daemon.
1804 =head2 Plugin C<dbi>
1806 This plugin uses the B<dbi> library (L<http://libdbi.sourceforge.net/>) to
1807 connect to various databases, execute I<SQL> statements and read back the
1808 results. I<dbi> is an acronym for "database interface" in case you were
1809 wondering about the name. You can configure how each column is to be
1810 interpreted and the plugin will generate one or more data sets from each row
1811 returned according to these rules.
1813 Because the plugin is very generic, the configuration is a little more complex
1814 than those of other plugins. It usually looks something like this:
1817 <Query "out_of_stock">
1818 Statement "SELECT category, COUNT(*) AS value FROM products WHERE in_stock = 0 GROUP BY category"
1819 # Use with MySQL 5.0.0 or later
1823 InstancePrefix "out_of_stock"
1824 InstancesFrom "category"
1828 <Database "product_information">
1831 DriverOption "host" "localhost"
1832 DriverOption "username" "collectd"
1833 DriverOption "password" "aZo6daiw"
1834 DriverOption "dbname" "prod_info"
1835 SelectDB "prod_info"
1836 Query "out_of_stock"
1840 The configuration above defines one query with one result and one database. The
1841 query is then linked to the database with the B<Query> option I<within> the
1842 B<E<lt>DatabaseE<gt>> block. You can have any number of queries and databases
1843 and you can also use the B<Include> statement to split up the configuration
1844 file in multiple, smaller files. However, the B<E<lt>QueryE<gt>> block I<must>
1845 precede the B<E<lt>DatabaseE<gt>> blocks, because the file is interpreted from
1848 The following is a complete list of options:
1850 =head3 B<Query> blocks
1852 Query blocks define I<SQL> statements and how the returned data should be
1853 interpreted. They are identified by the name that is given in the opening line
1854 of the block. Thus the name needs to be unique. Other than that, the name is
1855 not used in collectd.
1857 In each B<Query> block, there is one or more B<Result> blocks. B<Result> blocks
1858 define which column holds which value or instance information. You can use
1859 multiple B<Result> blocks to create multiple values from one returned row. This
1860 is especially useful, when queries take a long time and sending almost the same
1861 query again and again is not desirable.
1865 <Query "environment">
1866 Statement "select station, temperature, humidity from environment"
1869 # InstancePrefix "foo"
1870 InstancesFrom "station"
1871 ValuesFrom "temperature"
1875 InstancesFrom "station"
1876 ValuesFrom "humidity"
1880 The following options are accepted:
1884 =item B<Statement> I<SQL>
1886 Sets the statement that should be executed on the server. This is B<not>
1887 interpreted by collectd, but simply passed to the database server. Therefore,
1888 the SQL dialect that's used depends on the server collectd is connected to.
1890 The query has to return at least two columns, one for the instance and one
1891 value. You cannot omit the instance, even if the statement is guaranteed to
1892 always return exactly one line. In that case, you can usually specify something
1895 Statement "SELECT \"instance\", COUNT(*) AS value FROM table"
1897 (That works with MySQL but may not be valid SQL according to the spec. If you
1898 use a more strict database server, you may have to select from a dummy table or
1901 Please note that some databases, for example B<Oracle>, will fail if you
1902 include a semicolon at the end of the statement.
1904 =item B<MinVersion> I<Version>
1906 =item B<MaxVersion> I<Value>
1908 Only use this query for the specified database version. You can use these
1909 options to provide multiple queries with the same name but with a slightly
1910 different syntax. The plugin will use only those queries, where the specified
1911 minimum and maximum versions fit the version of the database in use.
1913 The database version is determined by C<dbi_conn_get_engine_version>, see the
1914 L<libdbi documentation|http://libdbi.sourceforge.net/docs/programmers-guide/reference-conn.html#DBI-CONN-GET-ENGINE-VERSION>
1915 for details. Basically, each part of the version is assumed to be in the range
1916 from B<00> to B<99> and all dots are removed. So version "4.1.2" becomes
1917 "40102", version "5.0.42" becomes "50042".
1919 B<Warning:> The plugin will use B<all> matching queries, so if you specify
1920 multiple queries with the same name and B<overlapping> ranges, weird stuff will
1921 happen. Don't to it! A valid example would be something along these lines:
1932 In the above example, there are three ranges that don't overlap. The last one
1933 goes from version "5.1.0" to infinity, meaning "all later versions". Versions
1934 before "4.0.0" are not specified.
1936 =item B<Type> I<Type>
1938 The B<type> that's used for each line returned. See L<types.db(5)> for more
1939 details on how types are defined. In short: A type is a predefined layout of
1940 data and the number of values and type of values has to match the type
1943 If you specify "temperature" here, you need exactly one gauge column. If you
1944 specify "if_octets", you will need two counter columns. See the B<ValuesFrom>
1947 There must be exactly one B<Type> option inside each B<Result> block.
1949 =item B<InstancePrefix> I<prefix>
1951 Prepends I<prefix> to the type instance. If B<InstancesFrom> (see below) is not
1952 given, the string is simply copied. If B<InstancesFrom> is given, I<prefix> and
1953 all strings returned in the appropriate columns are concatenated together,
1954 separated by dashes I<("-")>.
1956 =item B<InstancesFrom> I<column0> [I<column1> ...]
1958 Specifies the columns whose values will be used to create the "type-instance"
1959 for each row. If you specify more than one column, the value of all columns
1960 will be joined together with dashes I<("-")> as separation characters.
1962 The plugin itself does not check whether or not all built instances are
1963 different. It's your responsibility to assure that each is unique. This is
1964 especially true, if you do not specify B<InstancesFrom>: B<You> have to make
1965 sure that only one row is returned in this case.
1967 If neither B<InstancePrefix> nor B<InstancesFrom> is given, the type-instance
1970 =item B<ValuesFrom> I<column0> [I<column1> ...]
1972 Names the columns whose content is used as the actual data for the data sets
1973 that are dispatched to the daemon. How many such columns you need is determined
1974 by the B<Type> setting above. If you specify too many or not enough columns,
1975 the plugin will complain about that and no data will be submitted to the
1978 The actual data type in the columns is not that important. The plugin will
1979 automatically cast the values to the right type if it know how to do that. So
1980 it should be able to handle integer an floating point types, as well as strings
1981 (if they include a number at the beginning).
1983 There must be at least one B<ValuesFrom> option inside each B<Result> block.
1985 =item B<MetadataFrom> [I<column0> I<column1> ...]
1987 Names the columns whose content is used as metadata for the data sets
1988 that are dispatched to the daemon.
1990 The actual data type in the columns is not that important. The plugin will
1991 automatically cast the values to the right type if it know how to do that. So
1992 it should be able to handle integer an floating point types, as well as strings
1993 (if they include a number at the beginning).
1997 =head3 B<Database> blocks
1999 Database blocks define a connection to a database and which queries should be
2000 sent to that database. Since the used "dbi" library can handle a wide variety
2001 of databases, the configuration is very generic. If in doubt, refer to libdbi's
2002 documentationE<nbsp>- we stick as close to the terminology used there.
2004 Each database needs a "name" as string argument in the starting tag of the
2005 block. This name will be used as "PluginInstance" in the values submitted to
2006 the daemon. Other than that, that name is not used.
2010 =item B<Interval> I<Interval>
2012 Sets the interval (in seconds) in which the values will be collected from this
2013 database. By default the global B<Interval> setting will be used.
2015 =item B<Driver> I<Driver>
2017 Specifies the driver to use to connect to the database. In many cases those
2018 drivers are named after the database they can connect to, but this is not a
2019 technical necessity. These drivers are sometimes referred to as "DBD",
2020 B<D>ataB<B>ase B<D>river, and some distributions ship them in separate
2021 packages. Drivers for the "dbi" library are developed by the B<libdbi-drivers>
2022 project at L<http://libdbi-drivers.sourceforge.net/>.
2024 You need to give the driver name as expected by the "dbi" library here. You
2025 should be able to find that in the documentation for each driver. If you
2026 mistype the driver name, the plugin will dump a list of all known driver names
2029 =item B<DriverOption> I<Key> I<Value>
2031 Sets driver-specific options. What option a driver supports can be found in the
2032 documentation for each driver, somewhere at
2033 L<http://libdbi-drivers.sourceforge.net/>. However, the options "host",
2034 "username", "password", and "dbname" seem to be deE<nbsp>facto standards.
2036 DBDs can register two types of options: String options and numeric options. The
2037 plugin will use the C<dbi_conn_set_option> function when the configuration
2038 provides a string and the C<dbi_conn_require_option_numeric> function when the
2039 configuration provides a number. So these two lines will actually result in
2040 different calls being used:
2042 DriverOption "Port" 1234 # numeric
2043 DriverOption "Port" "1234" # string
2045 Unfortunately, drivers are not too keen to report errors when an unknown option
2046 is passed to them, so invalid settings here may go unnoticed. This is not the
2047 plugin's fault, it will report errors if it gets them from the libraryE<nbsp>/
2048 the driver. If a driver complains about an option, the plugin will dump a
2049 complete list of all options understood by that driver to the log. There is no
2050 way to programatically find out if an option expects a string or a numeric
2051 argument, so you will have to refer to the appropriate DBD's documentation to
2052 find this out. Sorry.
2054 =item B<SelectDB> I<Database>
2056 In some cases, the database name you connect with is not the database name you
2057 want to use for querying data. If this option is set, the plugin will "select"
2058 (switch to) that database after the connection is established.
2060 =item B<Query> I<QueryName>
2062 Associates the query named I<QueryName> with this database connection. The
2063 query needs to be defined I<before> this statement, i.E<nbsp>e. all query
2064 blocks you want to refer to must be placed above the database block you want to
2067 =item B<Host> I<Hostname>
2069 Sets the B<host> field of I<value lists> to I<Hostname> when dispatching
2070 values. Defaults to the global hostname setting.
2078 =item B<Device> I<Device>
2080 Select partitions based on the devicename.
2082 =item B<MountPoint> I<Directory>
2084 Select partitions based on the mountpoint.
2086 =item B<FSType> I<FSType>
2088 Select partitions based on the filesystem type.
2090 =item B<IgnoreSelected> B<true>|B<false>
2092 Invert the selection: If set to true, all partitions B<except> the ones that
2093 match any one of the criteria are collected. By default only selected
2094 partitions are collected if a selection is made. If no selection is configured
2095 at all, B<all> partitions are selected.
2097 =item B<ReportByDevice> B<true>|B<false>
2099 Report using the device name rather than the mountpoint. i.e. with this I<false>,
2100 (the default), it will report a disk as "root", but with it I<true>, it will be
2101 "sda1" (or whichever).
2103 =item B<ReportInodes> B<true>|B<false>
2105 Enables or disables reporting of free, reserved and used inodes. Defaults to
2106 inode collection being disabled.
2108 Enable this option if inodes are a scarce resource for you, usually because
2109 many small files are stored on the disk. This is a usual scenario for mail
2110 transfer agents and web caches.
2112 =item B<ValuesAbsolute> B<true>|B<false>
2114 Enables or disables reporting of free and used disk space in 1K-blocks.
2115 Defaults to B<true>.
2117 =item B<ValuesPercentage> B<false>|B<true>
2119 Enables or disables reporting of free and used disk space in percentage.
2120 Defaults to B<false>.
2122 This is useful for deploying I<collectd> on the cloud, where machines with
2123 different disk size may exist. Then it is more practical to configure
2124 thresholds based on relative disk size.
2128 =head2 Plugin C<disk>
2130 The C<disk> plugin collects information about the usage of physical disks and
2131 logical disks (partitions). Values collected are the number of octets written
2132 to and read from a disk or partition, the number of read/write operations
2133 issued to the disk and a rather complex "time" it took for these commands to be
2136 Using the following two options you can ignore some disks or configure the
2137 collection only of specific disks.
2141 =item B<Disk> I<Name>
2143 Select the disk I<Name>. Whether it is collected or ignored depends on the
2144 B<IgnoreSelected> setting, see below. As with other plugins that use the
2145 daemon's ignorelist functionality, a string that starts and ends with a slash
2146 is interpreted as a regular expression. Examples:
2151 =item B<IgnoreSelected> B<true>|B<false>
2153 Sets whether selected disks, i.E<nbsp>e. the ones matches by any of the B<Disk>
2154 statements, are ignored or if all other disks are ignored. The behavior
2155 (hopefully) is intuitive: If no B<Disk> option is configured, all disks are
2156 collected. If at least one B<Disk> option is given and no B<IgnoreSelected> or
2157 set to B<false>, B<only> matching disks will be collected. If B<IgnoreSelected>
2158 is set to B<true>, all disks are collected B<except> the ones matched.
2160 =item B<UseBSDName> B<true>|B<false>
2162 Whether to use the device's "BSD Name", on MacE<nbsp>OSE<nbsp>X, instead of the
2163 default major/minor numbers. Requires collectd to be built with Apple's
2166 =item B<UdevNameAttr> I<Attribute>
2168 Attempt to override disk instance name with the value of a specified udev
2169 attribute when built with B<libudev>. If the attribute is not defined for the
2170 given device, the default name is used. Example:
2172 UdevNameAttr "DM_NAME"
2176 =head2 Plugin C<dns>
2180 =item B<Interface> I<Interface>
2182 The dns plugin uses B<libpcap> to capture dns traffic and analyzes it. This
2183 option sets the interface that should be used. If this option is not set, or
2184 set to "any", the plugin will try to get packets from B<all> interfaces. This
2185 may not work on certain platforms, such as MacE<nbsp>OSE<nbsp>X.
2187 =item B<IgnoreSource> I<IP-address>
2189 Ignore packets that originate from this address.
2191 =item B<SelectNumericQueryTypes> B<true>|B<false>
2193 Enabled by default, collects unknown (and thus presented as numeric only) query types.
2197 =head2 Plugin C<email>
2201 =item B<SocketFile> I<Path>
2203 Sets the socket-file which is to be created.
2205 =item B<SocketGroup> I<Group>
2207 If running as root change the group of the UNIX-socket after it has been
2208 created. Defaults to B<collectd>.
2210 =item B<SocketPerms> I<Permissions>
2212 Change the file permissions of the UNIX-socket after it has been created. The
2213 permissions must be given as a numeric, octal value as you would pass to
2214 L<chmod(1)>. Defaults to B<0770>.
2216 =item B<MaxConns> I<Number>
2218 Sets the maximum number of connections that can be handled in parallel. Since
2219 this many threads will be started immediately setting this to a very high
2220 value will waste valuable resources. Defaults to B<5> and will be forced to be
2221 at most B<16384> to prevent typos and dumb mistakes.
2225 =head2 Plugin C<ethstat>
2227 The I<ethstat plugin> collects information about network interface cards (NICs)
2228 by talking directly with the underlying kernel driver using L<ioctl(2)>.
2234 Map "rx_csum_offload_errors" "if_rx_errors" "checksum_offload"
2235 Map "multicast" "if_multicast"
2242 =item B<Interface> I<Name>
2244 Collect statistical information about interface I<Name>.
2246 =item B<Map> I<Name> I<Type> [I<TypeInstance>]
2248 By default, the plugin will submit values as type C<derive> and I<type
2249 instance> set to I<Name>, the name of the metric as reported by the driver. If
2250 an appropriate B<Map> option exists, the given I<Type> and, optionally,
2251 I<TypeInstance> will be used.
2253 =item B<MappedOnly> B<true>|B<false>
2255 When set to B<true>, only metrics that can be mapped to to a I<type> will be
2256 collected, all other metrics will be ignored. Defaults to B<false>.
2260 =head2 Plugin C<exec>
2262 Please make sure to read L<collectd-exec(5)> before using this plugin. It
2263 contains valuable information on when the executable is executed and the
2264 output that is expected from it.
2268 =item B<Exec> I<User>[:[I<Group>]] I<Executable> [I<E<lt>argE<gt>> [I<E<lt>argE<gt>> ...]]
2270 =item B<NotificationExec> I<User>[:[I<Group>]] I<Executable> [I<E<lt>argE<gt>> [I<E<lt>argE<gt>> ...]]
2272 Execute the executable I<Executable> as user I<User>. If the user name is
2273 followed by a colon and a group name, the effective group is set to that group.
2274 The real group and saved-set group will be set to the default group of that
2275 user. If no group is given the effective group ID will be the same as the real
2278 Please note that in order to change the user and/or group the daemon needs
2279 superuser privileges. If the daemon is run as an unprivileged user you must
2280 specify the same user/group here. If the daemon is run with superuser
2281 privileges, you must supply a non-root user here.
2283 The executable may be followed by optional arguments that are passed to the
2284 program. Please note that due to the configuration parsing numbers and boolean
2285 values may be changed. If you want to be absolutely sure that something is
2286 passed as-is please enclose it in quotes.
2288 The B<Exec> and B<NotificationExec> statements change the semantics of the
2289 programs executed, i.E<nbsp>e. the data passed to them and the response
2290 expected from them. This is documented in great detail in L<collectd-exec(5)>.
2294 =head2 Plugin C<fhcount>
2296 The C<fhcount> plugin provides statistics about used, unused and total number of
2297 file handles on Linux.
2299 The I<fhcount plugin> provides the following configuration options:
2303 =item B<ValuesAbsolute> B<true>|B<false>
2305 Enables or disables reporting of file handles usage in absolute numbers,
2306 e.g. file handles used. Defaults to B<true>.
2308 =item B<ValuesPercentage> B<false>|B<true>
2310 Enables or disables reporting of file handles usage in percentages, e.g.
2311 percent of file handles used. Defaults to B<false>.
2315 =head2 Plugin C<filecount>
2317 The C<filecount> plugin counts the number of files in a certain directory (and
2318 its subdirectories) and their combined size. The configuration is very straight
2321 <Plugin "filecount">
2322 <Directory "/var/qmail/queue/mess">
2323 Instance "qmail-message"
2325 <Directory "/var/qmail/queue/todo">
2326 Instance "qmail-todo"
2328 <Directory "/var/lib/php5">
2329 Instance "php5-sessions"
2334 The example above counts the number of files in QMail's queue directories and
2335 the number of PHP5 sessions. Jfiy: The "todo" queue holds the messages that
2336 QMail has not yet looked at, the "message" queue holds the messages that were
2337 classified into "local" and "remote".
2339 As you can see, the configuration consists of one or more C<Directory> blocks,
2340 each of which specifies a directory in which to count the files. Within those
2341 blocks, the following options are recognized:
2345 =item B<Instance> I<Instance>
2347 Sets the plugin instance to I<Instance>. That instance name must be unique, but
2348 it's your responsibility, the plugin doesn't check for that. If not given, the
2349 instance is set to the directory name with all slashes replaced by underscores
2350 and all leading underscores removed.
2352 =item B<Name> I<Pattern>
2354 Only count files that match I<Pattern>, where I<Pattern> is a shell-like
2355 wildcard as understood by L<fnmatch(3)>. Only the B<filename> is checked
2356 against the pattern, not the entire path. In case this makes it easier for you:
2357 This option has been named after the B<-name> parameter to L<find(1)>.
2359 =item B<MTime> I<Age>
2361 Count only files of a specific age: If I<Age> is greater than zero, only files
2362 that haven't been touched in the last I<Age> seconds are counted. If I<Age> is
2363 a negative number, this is inversed. For example, if B<-60> is specified, only
2364 files that have been modified in the last minute will be counted.
2366 The number can also be followed by a "multiplier" to easily specify a larger
2367 timespan. When given in this notation, the argument must in quoted, i.E<nbsp>e.
2368 must be passed as string. So the B<-60> could also be written as B<"-1m"> (one
2369 minute). Valid multipliers are C<s> (second), C<m> (minute), C<h> (hour), C<d>
2370 (day), C<w> (week), and C<y> (year). There is no "month" multiplier. You can
2371 also specify fractional numbers, e.E<nbsp>g. B<"0.5d"> is identical to
2374 =item B<Size> I<Size>
2376 Count only files of a specific size. When I<Size> is a positive number, only
2377 files that are at least this big are counted. If I<Size> is a negative number,
2378 this is inversed, i.E<nbsp>e. only files smaller than the absolute value of
2379 I<Size> are counted.
2381 As with the B<MTime> option, a "multiplier" may be added. For a detailed
2382 description see above. Valid multipliers here are C<b> (byte), C<k> (kilobyte),
2383 C<m> (megabyte), C<g> (gigabyte), C<t> (terabyte), and C<p> (petabyte). Please
2384 note that there are 1000 bytes in a kilobyte, not 1024.
2386 =item B<Recursive> I<true>|I<false>
2388 Controls whether or not to recurse into subdirectories. Enabled by default.
2390 =item B<IncludeHidden> I<true>|I<false>
2392 Controls whether or not to include "hidden" files and directories in the count.
2393 "Hidden" files and directories are those, whose name begins with a dot.
2394 Defaults to I<false>, i.e. by default hidden files and directories are ignored.
2398 =head2 Plugin C<GenericJMX>
2400 The I<GenericJMX plugin> is written in I<Java> and therefore documented in
2401 L<collectd-java(5)>.
2403 =head2 Plugin C<gmond>
2405 The I<gmond> plugin received the multicast traffic sent by B<gmond>, the
2406 statistics collection daemon of Ganglia. Mappings for the standard "metrics"
2407 are built-in, custom mappings may be added via B<Metric> blocks, see below.
2412 MCReceiveFrom "239.2.11.71" "8649"
2413 <Metric "swap_total">
2415 TypeInstance "total"
2418 <Metric "swap_free">
2425 The following metrics are built-in:
2431 load_one, load_five, load_fifteen
2435 cpu_user, cpu_system, cpu_idle, cpu_nice, cpu_wio
2439 mem_free, mem_shared, mem_buffers, mem_cached, mem_total
2451 Available configuration options:
2455 =item B<MCReceiveFrom> I<MCGroup> [I<Port>]
2457 Sets sets the multicast group and UDP port to which to subscribe.
2459 Default: B<239.2.11.71>E<nbsp>/E<nbsp>B<8649>
2461 =item E<lt>B<Metric> I<Name>E<gt>
2463 These blocks add a new metric conversion to the internal table. I<Name>, the
2464 string argument to the B<Metric> block, is the metric name as used by Ganglia.
2468 =item B<Type> I<Type>
2470 Type to map this metric to. Required.
2472 =item B<TypeInstance> I<Instance>
2474 Type-instance to use. Optional.
2476 =item B<DataSource> I<Name>
2478 Data source to map this metric to. If the configured type has exactly one data
2479 source, this is optional. Otherwise the option is required.
2485 =head2 Plugin C<gps>
2487 The C<gps plugin> connects to gpsd on the host machine.
2488 The host, port, timeout and pause are configurable.
2490 This is useful if you run an NTP server using a GPS for source and you want to
2493 Mind your GPS must send $--GSA for having the data reported!
2495 The following elements are collected:
2501 Number of satellites used for fix (type instance "used") and in view (type
2502 instance "visible"). 0 means no GPS satellites are visible.
2504 =item B<dilution_of_precision>
2506 Vertical and horizontal dilution (type instance "horizontal" or "vertical").
2507 It should be between 0 and 3.
2508 Look at the documentation of your GPS to know more.
2516 # Connect to localhost on gpsd regular port:
2521 # PauseConnect of 5 sec. between connection attempts.
2525 Available configuration options:
2529 =item B<Host> I<Host>
2531 The host on which gpsd daemon runs. Defaults to B<localhost>.
2533 =item B<Port> I<Port>
2535 Port to connect to gpsd on the host machine. Defaults to B<2947>.
2537 =item B<Timeout> I<Seconds>
2539 Timeout in seconds (default 0.015 sec).
2541 The GPS data stream is fetch by the plugin form the daemon.
2542 It waits for data to be available, if none arrives it times out
2543 and loop for another reading.
2544 Mind to put a low value gpsd expects value in the micro-seconds area
2545 (recommended is 500 us) since the waiting function is blocking.
2546 Value must be between 500 us and 5 sec., if outside that range the
2547 default value is applied.
2549 This only applies from gpsd release-2.95.
2551 =item B<PauseConnect> I<Seconds>
2553 Pause to apply between attempts of connection to gpsd in seconds (default 5 sec).
2557 =head2 Plugin C<hddtemp>
2559 To get values from B<hddtemp> collectd connects to B<localhost> (127.0.0.1),
2560 port B<7634/tcp>. The B<Host> and B<Port> options can be used to change these
2561 default values, see below. C<hddtemp> has to be running to work correctly. If
2562 C<hddtemp> is not running timeouts may appear which may interfere with other
2565 The B<hddtemp> homepage can be found at
2566 L<http://www.guzu.net/linux/hddtemp.php>.
2570 =item B<Host> I<Hostname>
2572 Hostname to connect to. Defaults to B<127.0.0.1>.
2574 =item B<Port> I<Port>
2576 TCP-Port to connect to. Defaults to B<7634>.
2580 =head2 Plugin C<interface>
2584 =item B<Interface> I<Interface>
2586 Select this interface. By default these interfaces will then be collected. For
2587 a more detailed description see B<IgnoreSelected> below.
2589 =item B<IgnoreSelected> I<true>|I<false>
2591 If no configuration if given, the B<traffic>-plugin will collect data from
2592 all interfaces. This may not be practical, especially for loopback- and
2593 similar interfaces. Thus, you can use the B<Interface>-option to pick the
2594 interfaces you're interested in. Sometimes, however, it's easier/preferred
2595 to collect all interfaces I<except> a few ones. This option enables you to
2596 do that: By setting B<IgnoreSelected> to I<true> the effect of
2597 B<Interface> is inverted: All selected interfaces are ignored and all
2598 other interfaces are collected.
2602 =head2 Plugin C<ipmi>
2606 =item B<Sensor> I<Sensor>
2608 Selects sensors to collect or to ignore, depending on B<IgnoreSelected>.
2610 =item B<IgnoreSelected> I<true>|I<false>
2612 If no configuration if given, the B<ipmi> plugin will collect data from all
2613 sensors found of type "temperature", "voltage", "current" and "fanspeed".
2614 This option enables you to do that: By setting B<IgnoreSelected> to I<true>
2615 the effect of B<Sensor> is inverted: All selected sensors are ignored and
2616 all other sensors are collected.
2618 =item B<NotifySensorAdd> I<true>|I<false>
2620 If a sensor appears after initialization time of a minute a notification
2623 =item B<NotifySensorRemove> I<true>|I<false>
2625 If a sensor disappears a notification is sent.
2627 =item B<NotifySensorNotPresent> I<true>|I<false>
2629 If you have for example dual power supply and one of them is (un)plugged then
2630 a notification is sent.
2634 =head2 Plugin C<iptables>
2638 =item B<Chain> I<Table> I<Chain> [I<Comment|Number> [I<Name>]]
2640 Select the rules to count. If only I<Table> and I<Chain> are given, this plugin
2641 will collect the counters of all rules which have a comment-match. The comment
2642 is then used as type-instance.
2644 If I<Comment> or I<Number> is given, only the rule with the matching comment or
2645 the I<n>th rule will be collected. Again, the comment (or the number) will be
2646 used as the type-instance.
2648 If I<Name> is supplied, it will be used as the type-instance instead of the
2649 comment or the number.
2653 =head2 Plugin C<irq>
2659 Select this irq. By default these irqs will then be collected. For a more
2660 detailed description see B<IgnoreSelected> below.
2662 =item B<IgnoreSelected> I<true>|I<false>
2664 If no configuration if given, the B<irq>-plugin will collect data from all
2665 irqs. This may not be practical, especially if no interrupts happen. Thus, you
2666 can use the B<Irq>-option to pick the interrupt you're interested in.
2667 Sometimes, however, it's easier/preferred to collect all interrupts I<except> a
2668 few ones. This option enables you to do that: By setting B<IgnoreSelected> to
2669 I<true> the effect of B<Irq> is inverted: All selected interrupts are ignored
2670 and all other interrupts are collected.
2674 =head2 Plugin C<java>
2676 The I<Java> plugin makes it possible to write extensions for collectd in Java.
2677 This section only discusses the syntax and semantic of the configuration
2678 options. For more in-depth information on the I<Java> plugin, please read
2679 L<collectd-java(5)>.
2684 JVMArg "-verbose:jni"
2685 JVMArg "-Djava.class.path=/opt/collectd/lib/collectd/bindings/java"
2686 LoadPlugin "org.collectd.java.Foobar"
2687 <Plugin "org.collectd.java.Foobar">
2688 # To be parsed by the plugin
2692 Available configuration options:
2696 =item B<JVMArg> I<Argument>
2698 Argument that is to be passed to the I<Java Virtual Machine> (JVM). This works
2699 exactly the way the arguments to the I<java> binary on the command line work.
2700 Execute C<javaE<nbsp>--help> for details.
2702 Please note that B<all> these options must appear B<before> (i.E<nbsp>e. above)
2703 any other options! When another option is found, the JVM will be started and
2704 later options will have to be ignored!
2706 =item B<LoadPlugin> I<JavaClass>
2708 Instantiates a new I<JavaClass> object. The constructor of this object very
2709 likely then registers one or more callback methods with the server.
2711 See L<collectd-java(5)> for details.
2713 When the first such option is found, the virtual machine (JVM) is created. This
2714 means that all B<JVMArg> options must appear before (i.E<nbsp>e. above) all
2715 B<LoadPlugin> options!
2717 =item B<Plugin> I<Name>
2719 The entire block is passed to the Java plugin as an
2720 I<org.collectd.api.OConfigItem> object.
2722 For this to work, the plugin has to register a configuration callback first,
2723 see L<collectd-java(5)/"config callback">. This means, that the B<Plugin> block
2724 must appear after the appropriate B<LoadPlugin> block. Also note, that I<Name>
2725 depends on the (Java) plugin registering the callback and is completely
2726 independent from the I<JavaClass> argument passed to B<LoadPlugin>.
2730 =head2 Plugin C<load>
2732 The I<Load plugin> collects the system load. These numbers give a rough overview
2733 over the utilization of a machine. The system load is defined as the number of
2734 runnable tasks in the run-queue and is provided by many operating systems as a
2735 one, five or fifteen minute average.
2737 The following configuration options are available:
2741 =item B<ReportRelative> B<false>|B<true>
2743 When enabled, system load divided by number of available CPU cores is reported
2744 for intervals 1 min, 5 min and 15 min. Defaults to false.
2749 =head2 Plugin C<logfile>
2753 =item B<LogLevel> B<debug|info|notice|warning|err>
2755 Sets the log-level. If, for example, set to B<notice>, then all events with
2756 severity B<notice>, B<warning>, or B<err> will be written to the logfile.
2758 Please note that B<debug> is only available if collectd has been compiled with
2761 =item B<File> I<File>
2763 Sets the file to write log messages to. The special strings B<stdout> and
2764 B<stderr> can be used to write to the standard output and standard error
2765 channels, respectively. This, of course, only makes much sense when I<collectd>
2766 is running in foreground- or non-daemon-mode.
2768 =item B<Timestamp> B<true>|B<false>
2770 Prefix all lines printed by the current time. Defaults to B<true>.
2772 =item B<PrintSeverity> B<true>|B<false>
2774 When enabled, all lines are prefixed by the severity of the log message, for
2775 example "warning". Defaults to B<false>.
2779 B<Note>: There is no need to notify the daemon after moving or removing the
2780 log file (e.E<nbsp>g. when rotating the logs). The plugin reopens the file
2781 for each line it writes.
2783 =head2 Plugin C<log_logstash>
2785 The I<log logstash plugin> behaves like the logfile plugin but formats
2786 messages as JSON events for logstash to parse and input.
2790 =item B<LogLevel> B<debug|info|notice|warning|err>
2792 Sets the log-level. If, for example, set to B<notice>, then all events with
2793 severity B<notice>, B<warning>, or B<err> will be written to the logfile.
2795 Please note that B<debug> is only available if collectd has been compiled with
2798 =item B<File> I<File>
2800 Sets the file to write log messages to. The special strings B<stdout> and
2801 B<stderr> can be used to write to the standard output and standard error
2802 channels, respectively. This, of course, only makes much sense when I<collectd>
2803 is running in foreground- or non-daemon-mode.
2807 B<Note>: There is no need to notify the daemon after moving or removing the
2808 log file (e.E<nbsp>g. when rotating the logs). The plugin reopens the file
2809 for each line it writes.
2811 =head2 Plugin C<lpar>
2813 The I<LPAR plugin> reads CPU statistics of I<Logical Partitions>, a
2814 virtualization technique for IBM POWER processors. It takes into account CPU
2815 time stolen from or donated to a partition, in addition to the usual user,
2816 system, I/O statistics.
2818 The following configuration options are available:
2822 =item B<CpuPoolStats> B<false>|B<true>
2824 When enabled, statistics about the processor pool are read, too. The partition
2825 needs to have pool authority in order to be able to acquire this information.
2828 =item B<ReportBySerial> B<false>|B<true>
2830 If enabled, the serial of the physical machine the partition is currently
2831 running on is reported as I<hostname> and the logical hostname of the machine
2832 is reported in the I<plugin instance>. Otherwise, the logical hostname will be
2833 used (just like other plugins) and the I<plugin instance> will be empty.
2838 =head2 Plugin C<mbmon>
2840 The C<mbmon plugin> uses mbmon to retrieve temperature, voltage, etc.
2842 Be default collectd connects to B<localhost> (127.0.0.1), port B<411/tcp>. The
2843 B<Host> and B<Port> options can be used to change these values, see below.
2844 C<mbmon> has to be running to work correctly. If C<mbmon> is not running
2845 timeouts may appear which may interfere with other statistics..
2847 C<mbmon> must be run with the -r option ("print TAG and Value format");
2848 Debian's F</etc/init.d/mbmon> script already does this, other people
2849 will need to ensure that this is the case.
2853 =item B<Host> I<Hostname>
2855 Hostname to connect to. Defaults to B<127.0.0.1>.
2857 =item B<Port> I<Port>
2859 TCP-Port to connect to. Defaults to B<411>.
2865 The C<md plugin> collects information from Linux Software-RAID devices (md).
2867 All reported values are of the type C<md_disks>. Reported type instances are
2868 I<active>, I<failed> (present but not operational), I<spare> (hot stand-by) and
2869 I<missing> (physically absent) disks.
2873 =item B<Device> I<Device>
2875 Select md devices based on device name. The I<device name> is the basename of
2876 the device, i.e. the name of the block device without the leading C</dev/>.
2877 See B<IgnoreSelected> for more details.
2879 =item B<IgnoreSelected> B<true>|B<false>
2881 Invert device selection: If set to B<true>, all md devices B<except> those
2882 listed using B<Device> are collected. If B<false> (the default), only those
2883 listed are collected. If no configuration is given, the B<md> plugin will
2884 collect data from all md devices.
2888 =head2 Plugin C<memcachec>
2890 The C<memcachec plugin> connects to a memcached server, queries one or more
2891 given I<pages> and parses the returned data according to user specification.
2892 The I<matches> used are the same as the matches used in the C<curl> and C<tail>
2895 In order to talk to the memcached server, this plugin uses the I<libmemcached>
2896 library. Please note that there is another library with a very similar name,
2897 libmemcache (notice the missing `d'), which is not applicable.
2899 Synopsis of the configuration:
2901 <Plugin "memcachec">
2902 <Page "plugin_instance">
2906 Regex "(\\d+) bytes sent"
2909 Instance "type_instance"
2914 The configuration options are:
2918 =item E<lt>B<Page> I<Name>E<gt>
2920 Each B<Page> block defines one I<page> to be queried from the memcached server.
2921 The block requires one string argument which is used as I<plugin instance>.
2923 =item B<Server> I<Address>
2925 Sets the server address to connect to when querying the page. Must be inside a
2930 When connected to the memcached server, asks for the page I<Key>.
2932 =item E<lt>B<Match>E<gt>
2934 Match blocks define which strings to look for and how matches substrings are
2935 interpreted. For a description of match blocks, please see L<"Plugin tail">.
2939 =head2 Plugin C<memcached>
2941 The B<memcached plugin> connects to a memcached server and queries statistics
2942 about cache utilization, memory and bandwidth used.
2943 L<http://www.danga.com/memcached/>
2945 <Plugin "memcached">
2947 Host "memcache.example.com"
2952 The plugin configuration consists of one or more B<Instance> blocks which
2953 specify one I<memcached> connection each. Within the B<Instance> blocks, the
2954 following options are allowed:
2958 =item B<Host> I<Hostname>
2960 Hostname to connect to. Defaults to B<127.0.0.1>.
2962 =item B<Port> I<Port>
2964 TCP-Port to connect to. Defaults to B<11211>.
2966 =item B<Socket> I<Path>
2968 Connect to I<memcached> using the UNIX domain socket at I<Path>. If this
2969 setting is given, the B<Host> and B<Port> settings are ignored.
2973 =head2 Plugin C<mic>
2975 The B<mic plugin> gathers CPU statistics, memory usage and temperatures from
2976 Intel's Many Integrated Core (MIC) systems.
2985 ShowTemperatures true
2988 IgnoreSelectedTemperature true
2993 IgnoreSelectedPower true
2996 The following options are valid inside the B<PluginE<nbsp>mic> block:
3000 =item B<ShowCPU> B<true>|B<false>
3002 If enabled (the default) a sum of the CPU usage across all cores is reported.
3004 =item B<ShowCPUCores> B<true>|B<false>
3006 If enabled (the default) per-core CPU usage is reported.
3008 =item B<ShowMemory> B<true>|B<false>
3010 If enabled (the default) the physical memory usage of the MIC system is
3013 =item B<ShowTemperatures> B<true>|B<false>
3015 If enabled (the default) various temperatures of the MIC system are reported.
3017 =item B<Temperature> I<Name>
3019 This option controls which temperatures are being reported. Whether matching
3020 temperatures are being ignored or I<only> matching temperatures are reported
3021 depends on the B<IgnoreSelectedTemperature> setting below. By default I<all>
3022 temperatures are reported.
3024 =item B<IgnoreSelectedTemperature> B<false>|B<true>
3026 Controls the behavior of the B<Temperature> setting above. If set to B<false>
3027 (the default) only temperatures matching a B<Temperature> option are reported
3028 or, if no B<Temperature> option is specified, all temperatures are reported. If
3029 set to B<true>, matching temperatures are I<ignored> and all other temperatures
3032 Known temperature names are:
3066 =item B<ShowPower> B<true>|B<false>
3068 If enabled (the default) various temperatures of the MIC system are reported.
3070 =item B<Power> I<Name>
3072 This option controls which power readings are being reported. Whether matching
3073 power readings are being ignored or I<only> matching power readings are reported
3074 depends on the B<IgnoreSelectedPower> setting below. By default I<all>
3075 power readings are reported.
3077 =item B<IgnoreSelectedPower> B<false>|B<true>
3079 Controls the behavior of the B<Power> setting above. If set to B<false>
3080 (the default) only power readings matching a B<Power> option are reported
3081 or, if no B<Power> option is specified, all power readings are reported. If
3082 set to B<true>, matching power readings are I<ignored> and all other power readings
3085 Known power names are:
3091 Total power utilization averaged over Time Window 0 (uWatts).
3095 Total power utilization averaged over Time Window 0 (uWatts).
3099 Instantaneous power (uWatts).
3103 Max instantaneous power (uWatts).
3107 PCI-E connector power (uWatts).
3111 2x3 connector power (uWatts).
3115 2x4 connector power (uWatts).
3123 Uncore rail (uVolts).
3127 Memory subsystem rail (uVolts).
3133 =head2 Plugin C<memory>
3135 The I<memory plugin> provides the following configuration options:
3139 =item B<ValuesAbsolute> B<true>|B<false>
3141 Enables or disables reporting of physical memory usage in absolute numbers,
3142 i.e. bytes. Defaults to B<true>.
3144 =item B<ValuesPercentage> B<false>|B<true>
3146 Enables or disables reporting of physical memory usage in percentages, e.g.
3147 percent of physical memory used. Defaults to B<false>.
3149 This is useful for deploying I<collectd> in a heterogeneous environment in
3150 which the sizes of physical memory vary.
3154 =head2 Plugin C<modbus>
3156 The B<modbus plugin> connects to a Modbus "slave" via Modbus/TCP or Modbus/RTU and
3157 reads register values. It supports reading single registers (unsigned 16E<nbsp>bit
3158 values), large integer values (unsigned 32E<nbsp>bit values) and floating point
3159 values (two registers interpreted as IEEE floats in big endian notation).
3163 <Data "voltage-input-1">
3166 RegisterCmd ReadHolding
3171 <Data "voltage-input-2">
3174 RegisterCmd ReadHolding
3179 <Data "supply-temperature-1">
3182 RegisterCmd ReadHolding
3187 <Host "modbus.example.com">
3188 Address "192.168.0.42"
3193 Instance "power-supply"
3194 Collect "voltage-input-1"
3195 Collect "voltage-input-2"
3200 Device "/dev/ttyUSB0"
3205 Instance "temperature"
3206 Collect "supply-temperature-1"
3212 =item E<lt>B<Data> I<Name>E<gt> blocks
3214 Data blocks define a mapping between register numbers and the "types" used by
3217 Within E<lt>DataE<nbsp>/E<gt> blocks, the following options are allowed:
3221 =item B<RegisterBase> I<Number>
3223 Configures the base register to read from the device. If the option
3224 B<RegisterType> has been set to B<Uint32> or B<Float>, this and the next
3225 register will be read (the register number is increased by one).
3227 =item B<RegisterType> B<Int16>|B<Int32>|B<Uint16>|B<Uint32>|B<Float>
3229 Specifies what kind of data is returned by the device. If the type is B<Int32>,
3230 B<Uint32> or B<Float>, two 16E<nbsp>bit registers will be read and the data is
3231 combined into one value. Defaults to B<Uint16>.
3233 =item B<RegisterCmd> B<ReadHolding>|B<ReadInput>
3235 Specifies register type to be collected from device. Works only with libmodbus
3236 2.9.2 or higher. Defaults to B<ReadHolding>.
3238 =item B<Type> I<Type>
3240 Specifies the "type" (data set) to use when dispatching the value to
3241 I<collectd>. Currently, only data sets with exactly one data source are
3244 =item B<Instance> I<Instance>
3246 Sets the type instance to use when dispatching the value to I<collectd>. If
3247 unset, an empty string (no type instance) is used.
3251 =item E<lt>B<Host> I<Name>E<gt> blocks
3253 Host blocks are used to specify to which hosts to connect and what data to read
3254 from their "slaves". The string argument I<Name> is used as hostname when
3255 dispatching the values to I<collectd>.
3257 Within E<lt>HostE<nbsp>/E<gt> blocks, the following options are allowed:
3261 =item B<Address> I<Hostname>
3263 For Modbus/TCP, specifies the node name (the actual network address) used to
3264 connect to the host. This may be an IP address or a hostname. Please note that
3265 the used I<libmodbus> library only supports IPv4 at the moment.
3267 =item B<Port> I<Service>
3269 for Modbus/TCP, specifies the port used to connect to the host. The port can
3270 either be given as a number or as a service name. Please note that the
3271 I<Service> argument must be a string, even if ports are given in their numerical
3272 form. Defaults to "502".
3274 =item B<Device> I<Devicenode>
3276 For Modbus/RTU, specifies the path to the serial device being used.
3278 =item B<Baudrate> I<Baudrate>
3280 For Modbus/RTU, specifies the baud rate of the serial device.
3281 Note, connections currently support only 8/N/1.
3283 =item B<Interval> I<Interval>
3285 Sets the interval (in seconds) in which the values will be collected from this
3286 host. By default the global B<Interval> setting will be used.
3288 =item E<lt>B<Slave> I<ID>E<gt>
3290 Over each connection, multiple Modbus devices may be reached. The slave ID
3291 is used to specify which device should be addressed. For each device you want
3292 to query, one B<Slave> block must be given.
3294 Within E<lt>SlaveE<nbsp>/E<gt> blocks, the following options are allowed:
3298 =item B<Instance> I<Instance>
3300 Specify the plugin instance to use when dispatching the values to I<collectd>.
3301 By default "slave_I<ID>" is used.
3303 =item B<Collect> I<DataName>
3305 Specifies which data to retrieve from the device. I<DataName> must be the same
3306 string as the I<Name> argument passed to a B<Data> block. You can specify this
3307 option multiple times to collect more than one value from a slave. At least one
3308 B<Collect> option is mandatory.
3316 =head2 Plugin C<mqtt>
3318 The I<MQTT plugin> can send metrics to MQTT (B<Publish> blocks) and receive
3319 values from MQTT (B<Subscribe> blocks).
3325 Host "mqtt.example.com"
3329 Host "mqtt.example.com"
3334 The plugin's configuration is in B<Publish> and/or B<Subscribe> blocks,
3335 configuring the sending and receiving direction respectively. The plugin will
3336 register a write callback named C<mqtt/I<name>> where I<name> is the string
3337 argument given to the B<Publish> block. Both types of blocks share many but not
3338 all of the following options. If an option is valid in only one of the blocks,
3339 it will be mentioned explicitly.
3345 =item B<Host> I<Hostname>
3347 Hostname of the MQTT broker to connect to.
3349 =item B<Port> I<Service>
3351 Port number or service name of the MQTT broker to connect to.
3353 =item B<User> I<UserName>
3355 Username used when authenticating to the MQTT broker.
3357 =item B<Password> I<Password>
3359 Password used when authenticating to the MQTT broker.
3361 =item B<ClientId> I<ClientId>
3363 MQTT client ID to use. Defaults to the hostname used by I<collectd>.
3365 =item B<QoS> [B<0>-B<2>]
3367 Sets the I<Quality of Service>, with the values C<0>, C<1> and C<2> meaning:
3385 In B<Publish> blocks, this option determines the QoS flag set on outgoing
3386 messages and defaults to B<0>. In B<Subscribe> blocks, determines the maximum
3387 QoS setting the client is going to accept and defaults to B<2>. If the QoS flag
3388 on a message is larger than the maximum accepted QoS of a subscriber, the
3389 message's QoS will be downgraded.
3391 =item B<Prefix> I<Prefix> (Publish only)
3393 This plugin will use one topic per I<value list> which will looks like a path.
3394 I<Prefix> is used as the first path element and defaults to B<collectd>.
3396 An example topic name would be:
3398 collectd/cpu-0/cpu-user
3400 =item B<Retain> B<false>|B<true> (Publish only)
3402 Controls whether the MQTT broker will retain (keep a copy of) the last message
3403 sent to each topic and deliver it to new subscribers. Defaults to B<false>.
3405 =item B<StoreRates> B<true>|B<false> (Publish only)
3407 Controls whether C<DERIVE> and C<COUNTER> metrics are converted to a I<rate>
3408 before sending. Defaults to B<true>.
3410 =item B<CleanSession> B<true>|B<false> (Subscribe only)
3412 Controls whether the MQTT "cleans" the session up after the subscriber
3413 disconnects or if it maintains the subscriber's subscriptions and all messages
3414 that arrive while the subscriber is disconnected. Defaults to B<true>.
3416 =item B<Topic> I<TopicName> (Subscribe only)
3418 Configures the topic(s) to subscribe to. You can use the single level C<+> and
3419 multi level C<#> wildcards. Defaults to B<collectd/#>, i.e. all topics beneath
3420 the B<collectd> branch.
3424 =head2 Plugin C<mysql>
3426 The C<mysql plugin> requires B<mysqlclient> to be installed. It connects to
3427 one or more databases when started and keeps the connection up as long as
3428 possible. When the connection is interrupted for whatever reason it will try
3429 to re-connect. The plugin will complain loudly in case anything goes wrong.
3431 This plugin issues the MySQL C<SHOW STATUS> / C<SHOW GLOBAL STATUS> command
3432 and collects information about MySQL network traffic, executed statements,
3433 requests, the query cache and threads by evaluating the
3434 C<Bytes_{received,sent}>, C<Com_*>, C<Handler_*>, C<Qcache_*> and C<Threads_*>
3435 return values. Please refer to the B<MySQL reference manual>, I<5.1.6. Server
3436 Status Variables> for an explanation of these values.
3438 Optionally, master and slave statistics may be collected in a MySQL
3439 replication setup. In that case, information about the synchronization state
3440 of the nodes are collected by evaluating the C<Position> return value of the
3441 C<SHOW MASTER STATUS> command and the C<Seconds_Behind_Master>,
3442 C<Read_Master_Log_Pos> and C<Exec_Master_Log_Pos> return values of the
3443 C<SHOW SLAVE STATUS> command. See the B<MySQL reference manual>,
3444 I<12.5.5.21 SHOW MASTER STATUS Syntax> and
3445 I<12.5.5.31 SHOW SLAVE STATUS Syntax> for details.
3462 Socket "/var/run/mysql/mysqld.sock"
3464 SlaveNotifications true
3468 A B<Database> block defines one connection to a MySQL database. It accepts a
3469 single argument which specifies the name of the database. None of the other
3470 options are required. MySQL will use default values as documented in the
3471 section "mysql_real_connect()" in the B<MySQL reference manual>.
3475 =item B<Alias> I<Alias>
3477 Alias to use as sender instead of hostname when reporting. This may be useful
3478 when having cryptic hostnames.
3480 =item B<Host> I<Hostname>
3482 Hostname of the database server. Defaults to B<localhost>.
3484 =item B<User> I<Username>
3486 Username to use when connecting to the database. The user does not have to be
3487 granted any privileges (which is synonym to granting the C<USAGE> privilege),
3488 unless you want to collectd replication statistics (see B<MasterStats> and
3489 B<SlaveStats> below). In this case, the user needs the C<REPLICATION CLIENT>
3490 (or C<SUPER>) privileges. Else, any existing MySQL user will do.
3492 =item B<Password> I<Password>
3494 Password needed to log into the database.
3496 =item B<Database> I<Database>
3498 Select this database. Defaults to I<no database> which is a perfectly reasonable
3499 option for what this plugin does.
3501 =item B<Port> I<Port>
3503 TCP-port to connect to. The port must be specified in its numeric form, but it
3504 must be passed as a string nonetheless. For example:
3508 If B<Host> is set to B<localhost> (the default), this setting has no effect.
3509 See the documentation for the C<mysql_real_connect> function for details.
3511 =item B<Socket> I<Socket>
3513 Specifies the path to the UNIX domain socket of the MySQL server. This option
3514 only has any effect, if B<Host> is set to B<localhost> (the default).
3515 Otherwise, use the B<Port> option above. See the documentation for the
3516 C<mysql_real_connect> function for details.
3518 =item B<InnodbStats> I<true|false>
3520 If enabled, metrics about the InnoDB storage engine are collected.
3521 Disabled by default.
3523 =item B<MasterStats> I<true|false>
3525 =item B<SlaveStats> I<true|false>
3527 Enable the collection of master / slave statistics in a replication setup. In
3528 order to be able to get access to these statistics, the user needs special
3529 privileges. See the B<User> documentation above. Defaults to B<false>.
3531 =item B<SlaveNotifications> I<true|false>
3533 If enabled, the plugin sends a notification if the replication slave I/O and /
3534 or SQL threads are not running. Defaults to B<false>.
3536 =item B<ConnectTimeout> I<Seconds>
3538 Sets the connect timeout for the MySQL client.
3542 =head2 Plugin C<netapp>
3544 The netapp plugin can collect various performance and capacity information
3545 from a NetApp filer using the NetApp API.
3547 Please note that NetApp has a wide line of products and a lot of different
3548 software versions for each of these products. This plugin was developed for a
3549 NetApp FAS3040 running OnTap 7.2.3P8 and tested on FAS2050 7.3.1.1L1,
3550 FAS3140 7.2.5.1 and FAS3020 7.2.4P9. It I<should> work for most combinations of
3551 model and software version but it is very hard to test this.
3552 If you have used this plugin with other models and/or software version, feel
3553 free to send us a mail to tell us about the results, even if it's just a short
3556 To collect these data collectd will log in to the NetApp via HTTP(S) and HTTP
3557 basic authentication.
3559 B<Do not use a regular user for this!> Create a special collectd user with just
3560 the minimum of capabilities needed. The user only needs the "login-http-admin"
3561 capability as well as a few more depending on which data will be collected.
3562 Required capabilities are documented below.
3567 <Host "netapp1.example.com">
3591 IgnoreSelectedIO false
3593 IgnoreSelectedOps false
3594 GetLatency "volume0"
3595 IgnoreSelectedLatency false
3602 IgnoreSelectedCapacity false
3605 IgnoreSelectedSnapshot false
3633 The netapp plugin accepts the following configuration options:
3637 =item B<Host> I<Name>
3639 A host block defines one NetApp filer. It will appear in collectd with the name
3640 you specify here which does not have to be its real name nor its hostname (see
3641 the B<Address> option below).
3643 =item B<VFiler> I<Name>
3645 A B<VFiler> block may only be used inside a host block. It accepts all the
3646 same options as the B<Host> block (except for cascaded B<VFiler> blocks) and
3647 will execute all NetApp API commands in the context of the specified
3648 VFiler(R). It will appear in collectd with the name you specify here which
3649 does not have to be its real name. The VFiler name may be specified using the
3650 B<VFilerName> option. If this is not specified, it will default to the name
3653 The VFiler block inherits all connection related settings from the surrounding
3654 B<Host> block (which appear before the B<VFiler> block) but they may be
3655 overwritten inside the B<VFiler> block.
3657 This feature is useful, for example, when using a VFiler as SnapVault target
3658 (supported since OnTap 8.1). In that case, the SnapVault statistics are not
3659 available in the host filer (vfiler0) but only in the respective VFiler
3662 =item B<Protocol> B<httpd>|B<http>
3664 The protocol collectd will use to query this host.
3672 Valid options: http, https
3674 =item B<Address> I<Address>
3676 The hostname or IP address of the host.
3682 Default: The "host" block's name.
3684 =item B<Port> I<Port>
3686 The TCP port to connect to on the host.
3692 Default: 80 for protocol "http", 443 for protocol "https"
3694 =item B<User> I<User>
3696 =item B<Password> I<Password>
3698 The username and password to use to login to the NetApp.
3704 =item B<VFilerName> I<Name>
3706 The name of the VFiler in which context to execute API commands. If not
3707 specified, the name provided to the B<VFiler> block will be used instead.
3713 Default: name of the B<VFiler> block
3715 B<Note:> This option may only be used inside B<VFiler> blocks.
3717 =item B<Interval> I<Interval>
3723 The following options decide what kind of data will be collected. You can
3724 either use them as a block and fine tune various parameters inside this block,
3725 use them as a single statement to just accept all default values, or omit it to
3726 not collect any data.
3728 The following options are valid inside all blocks:
3732 =item B<Interval> I<Seconds>
3734 Collect the respective statistics every I<Seconds> seconds. Defaults to the
3735 host specific setting.
3739 =head3 The System block
3741 This will collect various performance data about the whole system.
3743 B<Note:> To get this data the collectd user needs the
3744 "api-perf-object-get-instances" capability.
3748 =item B<Interval> I<Seconds>
3750 Collect disk statistics every I<Seconds> seconds.
3752 =item B<GetCPULoad> B<true>|B<false>
3754 If you set this option to true the current CPU usage will be read. This will be
3755 the average usage between all CPUs in your NetApp without any information about
3758 B<Note:> These are the same values that the NetApp CLI command "sysstat"
3759 returns in the "CPU" field.
3767 Result: Two value lists of type "cpu", and type instances "idle" and "system".
3769 =item B<GetInterfaces> B<true>|B<false>
3771 If you set this option to true the current traffic of the network interfaces
3772 will be read. This will be the total traffic over all interfaces of your NetApp
3773 without any information about individual interfaces.
3775 B<Note:> This is the same values that the NetApp CLI command "sysstat" returns
3776 in the "Net kB/s" field.
3786 Result: One value list of type "if_octects".
3788 =item B<GetDiskIO> B<true>|B<false>
3790 If you set this option to true the current IO throughput will be read. This
3791 will be the total IO of your NetApp without any information about individual
3792 disks, volumes or aggregates.
3794 B<Note:> This is the same values that the NetApp CLI command "sysstat" returns
3795 in the "DiskE<nbsp>kB/s" field.
3803 Result: One value list of type "disk_octets".
3805 =item B<GetDiskOps> B<true>|B<false>
3807 If you set this option to true the current number of HTTP, NFS, CIFS, FCP,
3808 iSCSI, etc. operations will be read. This will be the total number of
3809 operations on your NetApp without any information about individual volumes or
3812 B<Note:> These are the same values that the NetApp CLI command "sysstat"
3813 returns in the "NFS", "CIFS", "HTTP", "FCP" and "iSCSI" fields.
3821 Result: A variable number of value lists of type "disk_ops_complex". Each type
3822 of operation will result in one value list with the name of the operation as
3827 =head3 The WAFL block
3829 This will collect various performance data about the WAFL file system. At the
3830 moment this just means cache performance.
3832 B<Note:> To get this data the collectd user needs the
3833 "api-perf-object-get-instances" capability.
3835 B<Note:> The interface to get these values is classified as "Diagnostics" by
3836 NetApp. This means that it is not guaranteed to be stable even between minor
3841 =item B<Interval> I<Seconds>
3843 Collect disk statistics every I<Seconds> seconds.
3845 =item B<GetNameCache> B<true>|B<false>
3853 Result: One value list of type "cache_ratio" and type instance
3856 =item B<GetDirCache> B<true>|B<false>
3864 Result: One value list of type "cache_ratio" and type instance "find_dir_hit".
3866 =item B<GetInodeCache> B<true>|B<false>
3874 Result: One value list of type "cache_ratio" and type instance
3877 =item B<GetBufferCache> B<true>|B<false>
3879 B<Note:> This is the same value that the NetApp CLI command "sysstat" returns
3880 in the "Cache hit" field.
3888 Result: One value list of type "cache_ratio" and type instance "buf_hash_hit".
3892 =head3 The Disks block
3894 This will collect performance data about the individual disks in the NetApp.
3896 B<Note:> To get this data the collectd user needs the
3897 "api-perf-object-get-instances" capability.
3901 =item B<Interval> I<Seconds>
3903 Collect disk statistics every I<Seconds> seconds.
3905 =item B<GetBusy> B<true>|B<false>
3907 If you set this option to true the busy time of all disks will be calculated
3908 and the value of the busiest disk in the system will be written.
3910 B<Note:> This is the same values that the NetApp CLI command "sysstat" returns
3911 in the "Disk util" field. Probably.
3919 Result: One value list of type "percent" and type instance "disk_busy".
3923 =head3 The VolumePerf block
3925 This will collect various performance data about the individual volumes.
3927 You can select which data to collect about which volume using the following
3928 options. They follow the standard ignorelist semantic.
3930 B<Note:> To get this data the collectd user needs the
3931 I<api-perf-object-get-instances> capability.
3935 =item B<Interval> I<Seconds>
3937 Collect volume performance data every I<Seconds> seconds.
3939 =item B<GetIO> I<Volume>
3941 =item B<GetOps> I<Volume>
3943 =item B<GetLatency> I<Volume>
3945 Select the given volume for IO, operations or latency statistics collection.
3946 The argument is the name of the volume without the C</vol/> prefix.
3948 Since the standard ignorelist functionality is used here, you can use a string
3949 starting and ending with a slash to specify regular expression matching: To
3950 match the volumes "vol0", "vol2" and "vol7", you can use this regular
3953 GetIO "/^vol[027]$/"
3955 If no regular expression is specified, an exact match is required. Both,
3956 regular and exact matching are case sensitive.
3958 If no volume was specified at all for either of the three options, that data
3959 will be collected for all available volumes.
3961 =item B<IgnoreSelectedIO> B<true>|B<false>
3963 =item B<IgnoreSelectedOps> B<true>|B<false>
3965 =item B<IgnoreSelectedLatency> B<true>|B<false>
3967 When set to B<true>, the volumes selected for IO, operations or latency
3968 statistics collection will be ignored and the data will be collected for all
3971 When set to B<false>, data will only be collected for the specified volumes and
3972 all other volumes will be ignored.
3974 If no volumes have been specified with the above B<Get*> options, all volumes
3975 will be collected regardless of the B<IgnoreSelected*> option.
3977 Defaults to B<false>
3981 =head3 The VolumeUsage block
3983 This will collect capacity data about the individual volumes.
3985 B<Note:> To get this data the collectd user needs the I<api-volume-list-info>
3990 =item B<Interval> I<Seconds>
3992 Collect volume usage statistics every I<Seconds> seconds.
3994 =item B<GetCapacity> I<VolumeName>
3996 The current capacity of the volume will be collected. This will result in two
3997 to four value lists, depending on the configuration of the volume. All data
3998 sources are of type "df_complex" with the name of the volume as
4001 There will be type_instances "used" and "free" for the number of used and
4002 available bytes on the volume. If the volume has some space reserved for
4003 snapshots, a type_instance "snap_reserved" will be available. If the volume
4004 has SIS enabled, a type_instance "sis_saved" will be available. This is the
4005 number of bytes saved by the SIS feature.
4007 B<Note:> The current NetApp API has a bug that results in this value being
4008 reported as a 32E<nbsp>bit number. This plugin tries to guess the correct
4009 number which works most of the time. If you see strange values here, bug
4010 NetApp support to fix this.
4012 Repeat this option to specify multiple volumes.
4014 =item B<IgnoreSelectedCapacity> B<true>|B<false>
4016 Specify whether to collect only the volumes selected by the B<GetCapacity>
4017 option or to ignore those volumes. B<IgnoreSelectedCapacity> defaults to
4018 B<false>. However, if no B<GetCapacity> option is specified at all, all
4019 capacities will be selected anyway.
4021 =item B<GetSnapshot> I<VolumeName>
4023 Select volumes from which to collect snapshot information.
4025 Usually, the space used for snapshots is included in the space reported as
4026 "used". If snapshot information is collected as well, the space used for
4027 snapshots is subtracted from the used space.
4029 To make things even more interesting, it is possible to reserve space to be
4030 used for snapshots. If the space required for snapshots is less than that
4031 reserved space, there is "reserved free" and "reserved used" space in addition
4032 to "free" and "used". If the space required for snapshots exceeds the reserved
4033 space, that part allocated in the normal space is subtracted from the "used"
4036 Repeat this option to specify multiple volumes.
4038 =item B<IgnoreSelectedSnapshot>
4040 Specify whether to collect only the volumes selected by the B<GetSnapshot>
4041 option or to ignore those volumes. B<IgnoreSelectedSnapshot> defaults to
4042 B<false>. However, if no B<GetSnapshot> option is specified at all, all
4043 capacities will be selected anyway.
4047 =head3 The Quota block
4049 This will collect (tree) quota statistics (used disk space and number of used
4050 files). This mechanism is useful to get usage information for single qtrees.
4051 In case the quotas are not used for any other purpose, an entry similar to the
4052 following in C</etc/quotas> would be sufficient:
4054 /vol/volA/some_qtree tree - - - - -
4056 After adding the entry, issue C<quota on -w volA> on the NetApp filer.
4060 =item B<Interval> I<Seconds>
4062 Collect SnapVault(R) statistics every I<Seconds> seconds.
4066 =head3 The SnapVault block
4068 This will collect statistics about the time and traffic of SnapVault(R)
4073 =item B<Interval> I<Seconds>
4075 Collect SnapVault(R) statistics every I<Seconds> seconds.
4079 =head2 Plugin C<netlink>
4081 The C<netlink> plugin uses a netlink socket to query the Linux kernel about
4082 statistics of various interface and routing aspects.
4086 =item B<Interface> I<Interface>
4088 =item B<VerboseInterface> I<Interface>
4090 Instruct the plugin to collect interface statistics. This is basically the same
4091 as the statistics provided by the C<interface> plugin (see above) but
4092 potentially much more detailed.
4094 When configuring with B<Interface> only the basic statistics will be collected,
4095 namely octets, packets, and errors. These statistics are collected by
4096 the C<interface> plugin, too, so using both at the same time is no benefit.
4098 When configured with B<VerboseInterface> all counters B<except> the basic ones,
4099 so that no data needs to be collected twice if you use the C<interface> plugin.
4100 This includes dropped packets, received multicast packets, collisions and a
4101 whole zoo of differentiated RX and TX errors. You can try the following command
4102 to get an idea of what awaits you:
4106 If I<Interface> is B<All>, all interfaces will be selected.
4108 =item B<QDisc> I<Interface> [I<QDisc>]
4110 =item B<Class> I<Interface> [I<Class>]
4112 =item B<Filter> I<Interface> [I<Filter>]
4114 Collect the octets and packets that pass a certain qdisc, class or filter.
4116 QDiscs and classes are identified by their type and handle (or classid).
4117 Filters don't necessarily have a handle, therefore the parent's handle is used.
4118 The notation used in collectd differs from that used in tc(1) in that it
4119 doesn't skip the major or minor number if it's zero and doesn't print special
4120 ids by their name. So, for example, a qdisc may be identified by
4121 C<pfifo_fast-1:0> even though the minor number of B<all> qdiscs is zero and
4122 thus not displayed by tc(1).
4124 If B<QDisc>, B<Class>, or B<Filter> is given without the second argument,
4125 i.E<nbsp>.e. without an identifier, all qdiscs, classes, or filters that are
4126 associated with that interface will be collected.
4128 Since a filter itself doesn't necessarily have a handle, the parent's handle is
4129 used. This may lead to problems when more than one filter is attached to a
4130 qdisc or class. This isn't nice, but we don't know how this could be done any
4131 better. If you have a idea, please don't hesitate to tell us.
4133 As with the B<Interface> option you can specify B<All> as the interface,
4134 meaning all interfaces.
4136 Here are some examples to help you understand the above text more easily:
4139 VerboseInterface "All"
4140 QDisc "eth0" "pfifo_fast-1:0"
4142 Class "ppp0" "htb-1:10"
4143 Filter "ppp0" "u32-1:0"
4146 =item B<IgnoreSelected>
4148 The behavior is the same as with all other similar plugins: If nothing is
4149 selected at all, everything is collected. If some things are selected using the
4150 options described above, only these statistics are collected. If you set
4151 B<IgnoreSelected> to B<true>, this behavior is inverted, i.E<nbsp>e. the
4152 specified statistics will not be collected.
4156 =head2 Plugin C<network>
4158 The Network plugin sends data to a remote instance of collectd, receives data
4159 from a remote instance, or both at the same time. Data which has been received
4160 from the network is usually not transmitted again, but this can be activated, see
4161 the B<Forward> option below.
4163 The default IPv6 multicast group is C<ff18::efc0:4a42>. The default IPv4
4164 multicast group is C<239.192.74.66>. The default I<UDP> port is B<25826>.
4166 Both, B<Server> and B<Listen> can be used as single option or as block. When
4167 used as block, given options are valid for this socket only. The following
4168 example will export the metrics twice: Once to an "internal" server (without
4169 encryption and signing) and one to an external server (with cryptographic
4173 # Export to an internal server
4174 # (demonstrates usage without additional options)
4175 Server "collectd.internal.tld"
4177 # Export to an external server
4178 # (demonstrates usage with signature options)
4179 <Server "collectd.external.tld">
4180 SecurityLevel "sign"
4181 Username "myhostname"
4188 =item B<E<lt>Server> I<Host> [I<Port>]B<E<gt>>
4190 The B<Server> statement/block sets the server to send datagrams to. The
4191 statement may occur multiple times to send each datagram to multiple
4194 The argument I<Host> may be a hostname, an IPv4 address or an IPv6 address. The
4195 optional second argument specifies a port number or a service name. If not
4196 given, the default, B<25826>, is used.
4198 The following options are recognized within B<Server> blocks:
4202 =item B<SecurityLevel> B<Encrypt>|B<Sign>|B<None>
4204 Set the security you require for network communication. When the security level
4205 has been set to B<Encrypt>, data sent over the network will be encrypted using
4206 I<AES-256>. The integrity of encrypted packets is ensured using I<SHA-1>. When
4207 set to B<Sign>, transmitted data is signed using the I<HMAC-SHA-256> message
4208 authentication code. When set to B<None>, data is sent without any security.
4210 This feature is only available if the I<network> plugin was linked with
4213 =item B<Username> I<Username>
4215 Sets the username to transmit. This is used by the server to lookup the
4216 password. See B<AuthFile> below. All security levels except B<None> require
4219 This feature is only available if the I<network> plugin was linked with
4222 =item B<Password> I<Password>
4224 Sets a password (shared secret) for this socket. All security levels except
4225 B<None> require this setting.
4227 This feature is only available if the I<network> plugin was linked with
4230 =item B<Interface> I<Interface name>
4232 Set the outgoing interface for IP packets. This applies at least
4233 to IPv6 packets and if possible to IPv4. If this option is not applicable,
4234 undefined or a non-existent interface name is specified, the default
4235 behavior is to let the kernel choose the appropriate interface. Be warned
4236 that the manual selection of an interface for unicast traffic is only
4237 necessary in rare cases.
4239 =item B<ResolveInterval> I<Seconds>
4241 Sets the interval at which to re-resolve the DNS for the I<Host>. This is
4242 useful to force a regular DNS lookup to support a high availability setup. If
4243 not specified, re-resolves are never attempted.
4247 =item B<E<lt>Listen> I<Host> [I<Port>]B<E<gt>>
4249 The B<Listen> statement sets the interfaces to bind to. When multiple
4250 statements are found the daemon will bind to multiple interfaces.
4252 The argument I<Host> may be a hostname, an IPv4 address or an IPv6 address. If
4253 the argument is a multicast address the daemon will join that multicast group.
4254 The optional second argument specifies a port number or a service name. If not
4255 given, the default, B<25826>, is used.
4257 The following options are recognized within C<E<lt>ListenE<gt>> blocks:
4261 =item B<SecurityLevel> B<Encrypt>|B<Sign>|B<None>
4263 Set the security you require for network communication. When the security level
4264 has been set to B<Encrypt>, only encrypted data will be accepted. The integrity
4265 of encrypted packets is ensured using I<SHA-1>. When set to B<Sign>, only
4266 signed and encrypted data is accepted. When set to B<None>, all data will be
4267 accepted. If an B<AuthFile> option was given (see below), encrypted data is
4268 decrypted if possible.
4270 This feature is only available if the I<network> plugin was linked with
4273 =item B<AuthFile> I<Filename>
4275 Sets a file in which usernames are mapped to passwords. These passwords are
4276 used to verify signatures and to decrypt encrypted network packets. If
4277 B<SecurityLevel> is set to B<None>, this is optional. If given, signed data is
4278 verified and encrypted packets are decrypted. Otherwise, signed data is
4279 accepted without checking the signature and encrypted data cannot be decrypted.
4280 For the other security levels this option is mandatory.
4282 The file format is very simple: Each line consists of a username followed by a
4283 colon and any number of spaces followed by the password. To demonstrate, an
4284 example file could look like this:
4289 Each time a packet is received, the modification time of the file is checked
4290 using L<stat(2)>. If the file has been changed, the contents is re-read. While
4291 the file is being read, it is locked using L<fcntl(2)>.
4293 =item B<Interface> I<Interface name>
4295 Set the incoming interface for IP packets explicitly. This applies at least
4296 to IPv6 packets and if possible to IPv4. If this option is not applicable,
4297 undefined or a non-existent interface name is specified, the default
4298 behavior is, to let the kernel choose the appropriate interface. Thus incoming
4299 traffic gets only accepted, if it arrives on the given interface.
4303 =item B<TimeToLive> I<1-255>
4305 Set the time-to-live of sent packets. This applies to all, unicast and
4306 multicast, and IPv4 and IPv6 packets. The default is to not change this value.
4307 That means that multicast packets will be sent with a TTL of C<1> (one) on most
4310 =item B<MaxPacketSize> I<1024-65535>
4312 Set the maximum size for datagrams received over the network. Packets larger
4313 than this will be truncated. Defaults to 1452E<nbsp>bytes, which is the maximum
4314 payload size that can be transmitted in one Ethernet frame using IPv6E<nbsp>/
4317 On the server side, this limit should be set to the largest value used on
4318 I<any> client. Likewise, the value on the client must not be larger than the
4319 value on the server, or data will be lost.
4321 B<Compatibility:> Versions prior to I<versionE<nbsp>4.8> used a fixed sized
4322 buffer of 1024E<nbsp>bytes. Versions I<4.8>, I<4.9> and I<4.10> used a default
4323 value of 1024E<nbsp>bytes to avoid problems when sending data to an older
4326 =item B<Forward> I<true|false>
4328 If set to I<true>, write packets that were received via the network plugin to
4329 the sending sockets. This should only be activated when the B<Listen>- and
4330 B<Server>-statements differ. Otherwise packets may be send multiple times to
4331 the same multicast group. While this results in more network traffic than
4332 necessary it's not a huge problem since the plugin has a duplicate detection,
4333 so the values will not loop.
4335 =item B<ReportStats> B<true>|B<false>
4337 The network plugin cannot only receive and send statistics, it can also create
4338 statistics about itself. Collected data included the number of received and
4339 sent octets and packets, the length of the receive queue and the number of
4340 values handled. When set to B<true>, the I<Network plugin> will make these
4341 statistics available. Defaults to B<false>.
4345 =head2 Plugin C<nginx>
4347 This plugin collects the number of connections and requests handled by the
4348 C<nginx daemon> (speak: engineE<nbsp>X), a HTTP and mail server/proxy. It
4349 queries the page provided by the C<ngx_http_stub_status_module> module, which
4350 isn't compiled by default. Please refer to
4351 L<http://wiki.codemongers.com/NginxStubStatusModule> for more information on
4352 how to compile and configure nginx and this module.
4354 The following options are accepted by the C<nginx plugin>:
4358 =item B<URL> I<http://host/nginx_status>
4360 Sets the URL of the C<ngx_http_stub_status_module> output.
4362 =item B<User> I<Username>
4364 Optional user name needed for authentication.
4366 =item B<Password> I<Password>
4368 Optional password needed for authentication.
4370 =item B<VerifyPeer> B<true|false>
4372 Enable or disable peer SSL certificate verification. See
4373 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
4375 =item B<VerifyHost> B<true|false>
4377 Enable or disable peer host name verification. If enabled, the plugin checks
4378 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
4379 certificate matches the host name provided by the B<URL> option. If this
4380 identity check fails, the connection is aborted. Obviously, only works when
4381 connecting to a SSL enabled server. Enabled by default.
4383 =item B<CACert> I<File>
4385 File that holds one or more SSL certificates. If you want to use HTTPS you will
4386 possibly need this option. What CA certificates come bundled with C<libcurl>
4387 and are checked by default depends on the distribution you use.
4389 =item B<Timeout> I<Milliseconds>
4391 The B<Timeout> option sets the overall timeout for HTTP requests to B<URL>, in
4392 milliseconds. By default, the configured B<Interval> is used to set the
4397 =head2 Plugin C<notify_desktop>
4399 This plugin sends a desktop notification to a notification daemon, as defined
4400 in the Desktop Notification Specification. To actually display the
4401 notifications, B<notification-daemon> is required and B<collectd> has to be
4402 able to access the X server (i.E<nbsp>e., the C<DISPLAY> and C<XAUTHORITY>
4403 environment variables have to be set correctly) and the D-Bus message bus.
4405 The Desktop Notification Specification can be found at
4406 L<http://www.galago-project.org/specs/notification/>.
4410 =item B<OkayTimeout> I<timeout>
4412 =item B<WarningTimeout> I<timeout>
4414 =item B<FailureTimeout> I<timeout>
4416 Set the I<timeout>, in milliseconds, after which to expire the notification
4417 for C<OKAY>, C<WARNING> and C<FAILURE> severities respectively. If zero has
4418 been specified, the displayed notification will not be closed at all - the
4419 user has to do so herself. These options default to 5000. If a negative number
4420 has been specified, the default is used as well.
4424 =head2 Plugin C<notify_email>
4426 The I<notify_email> plugin uses the I<ESMTP> library to send notifications to a
4427 configured email address.
4429 I<libESMTP> is available from L<http://www.stafford.uklinux.net/libesmtp/>.
4431 Available configuration options:
4435 =item B<From> I<Address>
4437 Email address from which the emails should appear to come from.
4439 Default: C<root@localhost>
4441 =item B<Recipient> I<Address>
4443 Configures the email address(es) to which the notifications should be mailed.
4444 May be repeated to send notifications to multiple addresses.
4446 At least one B<Recipient> must be present for the plugin to work correctly.
4448 =item B<SMTPServer> I<Hostname>
4450 Hostname of the SMTP server to connect to.
4452 Default: C<localhost>
4454 =item B<SMTPPort> I<Port>
4456 TCP port to connect to.
4460 =item B<SMTPUser> I<Username>
4462 Username for ASMTP authentication. Optional.
4464 =item B<SMTPPassword> I<Password>
4466 Password for ASMTP authentication. Optional.
4468 =item B<Subject> I<Subject>
4470 Subject-template to use when sending emails. There must be exactly two
4471 string-placeholders in the subject, given in the standard I<printf(3)> syntax,
4472 i.E<nbsp>e. C<%s>. The first will be replaced with the severity, the second
4475 Default: C<Collectd notify: %s@%s>
4479 =head2 Plugin C<ntpd>
4483 =item B<Host> I<Hostname>
4485 Hostname of the host running B<ntpd>. Defaults to B<localhost>.
4487 =item B<Port> I<Port>
4489 UDP-Port to connect to. Defaults to B<123>.
4491 =item B<ReverseLookups> B<true>|B<false>
4493 Sets whether or not to perform reverse lookups on peers. Since the name or
4494 IP-address may be used in a filename it is recommended to disable reverse
4495 lookups. The default is to do reverse lookups to preserve backwards
4496 compatibility, though.
4498 =item B<IncludeUnitID> B<true>|B<false>
4500 When a peer is a refclock, include the unit ID in the I<type instance>.
4501 Defaults to B<false> for backward compatibility.
4503 If two refclock peers use the same driver and this is B<false>, the plugin will
4504 try to write simultaneous measurements from both to the same type instance.
4505 This will result in error messages in the log and only one set of measurements
4510 =head2 Plugin C<nut>
4514 =item B<UPS> I<upsname>B<@>I<hostname>[B<:>I<port>]
4516 Add a UPS to collect data from. The format is identical to the one accepted by
4521 =head2 Plugin C<olsrd>
4523 The I<olsrd> plugin connects to the TCP port opened by the I<txtinfo> plugin of
4524 the Optimized Link State Routing daemon and reads information about the current
4525 state of the meshed network.
4527 The following configuration options are understood:
4531 =item B<Host> I<Host>
4533 Connect to I<Host>. Defaults to B<"localhost">.
4535 =item B<Port> I<Port>
4537 Specifies the port to connect to. This must be a string, even if you give the
4538 port as a number rather than a service name. Defaults to B<"2006">.
4540 =item B<CollectLinks> B<No>|B<Summary>|B<Detail>
4542 Specifies what information to collect about links, i.E<nbsp>e. direct
4543 connections of the daemon queried. If set to B<No>, no information is
4544 collected. If set to B<Summary>, the number of links and the average of all
4545 I<link quality> (LQ) and I<neighbor link quality> (NLQ) values is calculated.
4546 If set to B<Detail> LQ and NLQ are collected per link.
4548 Defaults to B<Detail>.
4550 =item B<CollectRoutes> B<No>|B<Summary>|B<Detail>
4552 Specifies what information to collect about routes of the daemon queried. If
4553 set to B<No>, no information is collected. If set to B<Summary>, the number of
4554 routes and the average I<metric> and I<ETX> is calculated. If set to B<Detail>
4555 metric and ETX are collected per route.
4557 Defaults to B<Summary>.
4559 =item B<CollectTopology> B<No>|B<Summary>|B<Detail>
4561 Specifies what information to collect about the global topology. If set to
4562 B<No>, no information is collected. If set to B<Summary>, the number of links
4563 in the entire topology and the average I<link quality> (LQ) is calculated.
4564 If set to B<Detail> LQ and NLQ are collected for each link in the entire topology.
4566 Defaults to B<Summary>.
4570 =head2 Plugin C<onewire>
4572 B<EXPERIMENTAL!> See notes below.
4574 The C<onewire> plugin uses the B<owcapi> library from the B<owfs> project
4575 L<http://owfs.org/> to read sensors connected via the onewire bus.
4577 It can be used in two possible modes - standard or advanced.
4579 In the standard mode only temperature sensors (sensors with the family code
4580 C<10>, C<22> and C<28> - e.g. DS1820, DS18S20, DS1920) can be read. If you have
4581 other sensors you would like to have included, please send a sort request to
4582 the mailing list. You can select sensors to be read or to be ignored depending
4583 on the option B<IgnoreSelected>). When no list is provided the whole bus is
4584 walked and all sensors are read.
4586 Hubs (the DS2409 chips) are working, but read the note, why this plugin is
4587 experimental, below.
4589 In the advanced mode you can configure any sensor to be read (only numerical
4590 value) using full OWFS path (e.g. "/uncached/10.F10FCA000800/temperature").
4591 In this mode you have to list all the sensors. Neither default bus walk nor
4592 B<IgnoreSelected> are used here. Address and type (file) is extracted from
4593 the path automatically and should produce compatible structure with the "standard"
4594 mode (basically the path is expected as for example
4595 "/uncached/10.F10FCA000800/temperature" where it would extract address part
4596 "F10FCA000800" and the rest after the slash is considered the type - here
4598 There are two advantages to this mode - you can access virtually any sensor
4599 (not just temperature), select whether to use cached or directly read values
4600 and it is slighlty faster. The downside is more complex configuration.
4602 The two modes are distinguished automatically by the format of the address.
4603 It is not possible to mix the two modes. Once a full path is detected in any
4604 B<Sensor> then the whole addressing (all sensors) is considered to be this way
4605 (and as standard addresses will fail parsing they will be ignored).
4609 =item B<Device> I<Device>
4611 Sets the device to read the values from. This can either be a "real" hardware
4612 device, such as a serial port or an USB port, or the address of the
4613 L<owserver(1)> socket, usually B<localhost:4304>.
4615 Though the documentation claims to automatically recognize the given address
4616 format, with versionE<nbsp>2.7p4 we had to specify the type explicitly. So
4617 with that version, the following configuration worked for us:
4620 Device "-s localhost:4304"
4623 This directive is B<required> and does not have a default value.
4625 =item B<Sensor> I<Sensor>
4627 In the standard mode selects sensors to collect or to ignore
4628 (depending on B<IgnoreSelected>, see below). Sensors are specified without
4629 the family byte at the beginning, so you have to use for example C<F10FCA000800>,
4630 and B<not> include the leading C<10.> family byte and point.
4631 When no B<Sensor> is configured the whole Onewire bus is walked and all supported
4632 sensors (see above) are read.
4634 In the advanced mode the B<Sensor> specifies full OWFS path - e.g.
4635 C</uncached/10.F10FCA000800/temperature> (or when cached values are OK
4636 C</10.F10FCA000800/temperature>). B<IgnoreSelected> is not used.
4638 As there can be multiple devices on the bus you can list multiple sensor (use
4639 multiple B<Sensor> elements).
4641 =item B<IgnoreSelected> I<true>|I<false>
4643 If no configuration is given, the B<onewire> plugin will collect data from all
4644 sensors found. This may not be practical, especially if sensors are added and
4645 removed regularly. Sometimes, however, it's easier/preferred to collect only
4646 specific sensors or all sensors I<except> a few specified ones. This option
4647 enables you to do that: By setting B<IgnoreSelected> to I<true> the effect of
4648 B<Sensor> is inverted: All selected interfaces are ignored and all other
4649 interfaces are collected.
4651 Used only in the standard mode - see above.
4653 =item B<Interval> I<Seconds>
4655 Sets the interval in which all sensors should be read. If not specified, the
4656 global B<Interval> setting is used.
4660 B<EXPERIMENTAL!> The C<onewire> plugin is experimental, because it doesn't yet
4661 work with big setups. It works with one sensor being attached to one
4662 controller, but as soon as you throw in a couple more senors and maybe a hub
4663 or two, reading all values will take more than ten seconds (the default
4664 interval). We will probably add some separate thread for reading the sensors
4665 and some cache or something like that, but it's not done yet. We will try to
4666 maintain backwards compatibility in the future, but we can't promise. So in
4667 short: If it works for you: Great! But keep in mind that the config I<might>
4668 change, though this is unlikely. Oh, and if you want to help improving this
4669 plugin, just send a short notice to the mailing list. ThanksE<nbsp>:)
4671 =head2 Plugin C<openldap>
4673 To use the C<openldap> plugin you first need to configure the I<OpenLDAP>
4674 server correctly. The backend database C<monitor> needs to be loaded and
4675 working. See slapd-monitor(5) for the details.
4677 The configuration of the C<openldap> plugin consists of one or more B<Instance>
4678 blocks. Each block requires one string argument as the instance name. For
4683 URL "ldap://localhost/"
4686 URL "ldaps://localhost/"
4690 The instance name will be used as the I<plugin instance>. To emulate the old
4691 (versionE<nbsp>4) behavior, you can use an empty string (""). In order for the
4692 plugin to work correctly, each instance name must be unique. This is not
4693 enforced by the plugin and it is your responsibility to ensure it is.
4695 The following options are accepted within each B<Instance> block:
4699 =item B<URL> I<ldap://host/binddn>
4701 Sets the URL to use to connect to the I<OpenLDAP> server. This option is
4704 =item B<BindDN> I<BindDN>
4706 Name in the form of an LDAP distinguished name intended to be used for
4707 authentication. Defaults to empty string to establish an anonymous authorization.
4709 =item B<Password> I<Password>
4711 Password for simple bind authentication. If this option is not set,
4712 unauthenticated bind operation is used.
4714 =item B<StartTLS> B<true|false>
4716 Defines whether TLS must be used when connecting to the I<OpenLDAP> server.
4717 Disabled by default.
4719 =item B<VerifyHost> B<true|false>
4721 Enables or disables peer host name verification. If enabled, the plugin checks
4722 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
4723 certificate matches the host name provided by the B<URL> option. If this
4724 identity check fails, the connection is aborted. Enabled by default.
4726 =item B<CACert> I<File>
4728 File that holds one or more SSL certificates. If you want to use TLS/SSL you
4729 may possibly need this option. What CA certificates are checked by default
4730 depends on the distribution you use and can be changed with the usual ldap
4731 client configuration mechanisms. See ldap.conf(5) for the details.
4733 =item B<Timeout> I<Seconds>
4735 Sets the timeout value for ldap operations. Defaults to B<-1> which results in
4736 an infinite timeout.
4738 =item B<Version> I<Version>
4740 An integer which sets the LDAP protocol version number to use when connecting
4741 to the I<OpenLDAP> server. Defaults to B<3> for using I<LDAPv3>.
4745 =head2 Plugin C<openvpn>
4747 The OpenVPN plugin reads a status file maintained by OpenVPN and gathers
4748 traffic statistics about connected clients.
4750 To set up OpenVPN to write to the status file periodically, use the
4751 B<--status> option of OpenVPN. Since OpenVPN can write two different formats,
4752 you need to set the required format, too. This is done by setting
4753 B<--status-version> to B<2>.
4755 So, in a nutshell you need:
4757 openvpn $OTHER_OPTIONS \
4758 --status "/var/run/openvpn-status" 10 \
4765 =item B<StatusFile> I<File>
4767 Specifies the location of the status file.
4769 =item B<ImprovedNamingSchema> B<true>|B<false>
4771 When enabled, the filename of the status file will be used as plugin instance
4772 and the client's "common name" will be used as type instance. This is required
4773 when reading multiple status files. Enabling this option is recommended, but to
4774 maintain backwards compatibility this option is disabled by default.
4776 =item B<CollectCompression> B<true>|B<false>
4778 Sets whether or not statistics about the compression used by OpenVPN should be
4779 collected. This information is only available in I<single> mode. Enabled by
4782 =item B<CollectIndividualUsers> B<true>|B<false>
4784 Sets whether or not traffic information is collected for each connected client
4785 individually. If set to false, currently no traffic data is collected at all
4786 because aggregating this data in a save manner is tricky. Defaults to B<true>.
4788 =item B<CollectUserCount> B<true>|B<false>
4790 When enabled, the number of currently connected clients or users is collected.
4791 This is especially interesting when B<CollectIndividualUsers> is disabled, but
4792 can be configured independently from that option. Defaults to B<false>.
4796 =head2 Plugin C<oracle>
4798 The "oracle" plugin uses the Oracle® Call Interface I<(OCI)> to connect to an
4799 Oracle® Database and lets you execute SQL statements there. It is very similar
4800 to the "dbi" plugin, because it was written around the same time. See the "dbi"
4801 plugin's documentation above for details.
4804 <Query "out_of_stock">
4805 Statement "SELECT category, COUNT(*) AS value FROM products WHERE in_stock = 0 GROUP BY category"
4808 # InstancePrefix "foo"
4809 InstancesFrom "category"
4813 <Database "product_information">
4817 Query "out_of_stock"
4821 =head3 B<Query> blocks
4823 The Query blocks are handled identically to the Query blocks of the "dbi"
4824 plugin. Please see its documentation above for details on how to specify
4827 =head3 B<Database> blocks
4829 Database blocks define a connection to a database and which queries should be
4830 sent to that database. Each database needs a "name" as string argument in the
4831 starting tag of the block. This name will be used as "PluginInstance" in the
4832 values submitted to the daemon. Other than that, that name is not used.
4836 =item B<ConnectID> I<ID>
4838 Defines the "database alias" or "service name" to connect to. Usually, these
4839 names are defined in the file named C<$ORACLE_HOME/network/admin/tnsnames.ora>.
4841 =item B<Host> I<Host>
4843 Hostname to use when dispatching values for this database. Defaults to using
4844 the global hostname of the I<collectd> instance.
4846 =item B<Username> I<Username>
4848 Username used for authentication.
4850 =item B<Password> I<Password>
4852 Password used for authentication.
4854 =item B<Query> I<QueryName>
4856 Associates the query named I<QueryName> with this database connection. The
4857 query needs to be defined I<before> this statement, i.E<nbsp>e. all query
4858 blocks you want to refer to must be placed above the database block you want to
4863 =head2 Plugin C<perl>
4865 This plugin embeds a Perl-interpreter into collectd and provides an interface
4866 to collectd's plugin system. See L<collectd-perl(5)> for its documentation.
4868 =head2 Plugin C<pinba>
4870 The I<Pinba plugin> receives profiling information from I<Pinba>, an extension
4871 for the I<PHP> interpreter. At the end of executing a script, i.e. after a
4872 PHP-based webpage has been delivered, the extension will send a UDP packet
4873 containing timing information, peak memory usage and so on. The plugin will
4874 wait for such packets, parse them and account the provided information, which
4875 is then dispatched to the daemon once per interval.
4882 # Overall statistics for the website.
4884 Server "www.example.com"
4886 # Statistics for www-a only
4888 Host "www-a.example.com"
4889 Server "www.example.com"
4891 # Statistics for www-b only
4893 Host "www-b.example.com"
4894 Server "www.example.com"
4898 The plugin provides the following configuration options:
4902 =item B<Address> I<Node>
4904 Configures the address used to open a listening socket. By default, plugin will
4905 bind to the I<any> address C<::0>.
4907 =item B<Port> I<Service>
4909 Configures the port (service) to bind to. By default the default Pinba port
4910 "30002" will be used. The option accepts service names in addition to port
4911 numbers and thus requires a I<string> argument.
4913 =item E<lt>B<View> I<Name>E<gt> block
4915 The packets sent by the Pinba extension include the hostname of the server, the
4916 server name (the name of the virtual host) and the script that was executed.
4917 Using B<View> blocks it is possible to separate the data into multiple groups
4918 to get more meaningful statistics. Each packet is added to all matching groups,
4919 so that a packet may be accounted for more than once.
4923 =item B<Host> I<Host>
4925 Matches the hostname of the system the webserver / script is running on. This
4926 will contain the result of the L<gethostname(2)> system call. If not
4927 configured, all hostnames will be accepted.
4929 =item B<Server> I<Server>
4931 Matches the name of the I<virtual host>, i.e. the contents of the
4932 C<$_SERVER["SERVER_NAME"]> variable when within PHP. If not configured, all
4933 server names will be accepted.
4935 =item B<Script> I<Script>
4937 Matches the name of the I<script name>, i.e. the contents of the
4938 C<$_SERVER["SCRIPT_NAME"]> variable when within PHP. If not configured, all
4939 script names will be accepted.
4945 =head2 Plugin C<ping>
4947 The I<Ping> plugin starts a new thread which sends ICMP "ping" packets to the
4948 configured hosts periodically and measures the network latency. Whenever the
4949 C<read> function of the plugin is called, it submits the average latency, the
4950 standard deviation and the drop rate for each host.
4952 Available configuration options:
4956 =item B<Host> I<IP-address>
4958 Host to ping periodically. This option may be repeated several times to ping
4961 =item B<Interval> I<Seconds>
4963 Sets the interval in which to send ICMP echo packets to the configured hosts.
4964 This is B<not> the interval in which statistics are queries from the plugin but
4965 the interval in which the hosts are "pinged". Therefore, the setting here
4966 should be smaller than or equal to the global B<Interval> setting. Fractional
4967 times, such as "1.24" are allowed.
4971 =item B<Timeout> I<Seconds>
4973 Time to wait for a response from the host to which an ICMP packet had been
4974 sent. If a reply was not received after I<Seconds> seconds, the host is assumed
4975 to be down or the packet to be dropped. This setting must be smaller than the
4976 B<Interval> setting above for the plugin to work correctly. Fractional
4977 arguments are accepted.
4981 =item B<TTL> I<0-255>
4983 Sets the Time-To-Live of generated ICMP packets.
4985 =item B<SourceAddress> I<host>
4987 Sets the source address to use. I<host> may either be a numerical network
4988 address or a network hostname.
4990 =item B<Device> I<name>
4992 Sets the outgoing network device to be used. I<name> has to specify an
4993 interface name (e.E<nbsp>g. C<eth0>). This might not be supported by all
4996 =item B<MaxMissed> I<Packets>
4998 Trigger a DNS resolve after the host has not replied to I<Packets> packets. This
4999 enables the use of dynamic DNS services (like dyndns.org) with the ping plugin.
5001 Default: B<-1> (disabled)
5005 =head2 Plugin C<postgresql>
5007 The C<postgresql> plugin queries statistics from PostgreSQL databases. It
5008 keeps a persistent connection to all configured databases and tries to
5009 reconnect if the connection has been interrupted. A database is configured by
5010 specifying a B<Database> block as described below. The default statistics are
5011 collected from PostgreSQL's B<statistics collector> which thus has to be
5012 enabled for this plugin to work correctly. This should usually be the case by
5013 default. See the section "The Statistics Collector" of the B<PostgreSQL
5014 Documentation> for details.
5016 By specifying custom database queries using a B<Query> block as described
5017 below, you may collect any data that is available from some PostgreSQL
5018 database. This way, you are able to access statistics of external daemons
5019 which are available in a PostgreSQL database or use future or special
5020 statistics provided by PostgreSQL without the need to upgrade your collectd
5023 Starting with version 5.2, the C<postgresql> plugin supports writing data to
5024 PostgreSQL databases as well. This has been implemented in a generic way. You
5025 need to specify an SQL statement which will then be executed by collectd in
5026 order to write the data (see below for details). The benefit of that approach
5027 is that there is no fixed database layout. Rather, the layout may be optimized
5028 for the current setup.
5030 The B<PostgreSQL Documentation> manual can be found at
5031 L<http://www.postgresql.org/docs/manuals/>.
5035 Statement "SELECT magic FROM wizard WHERE host = $1;"
5039 InstancePrefix "magic"
5044 <Query rt36_tickets>
5045 Statement "SELECT COUNT(type) AS count, type \
5047 WHEN resolved = 'epoch' THEN 'open' \
5048 ELSE 'resolved' END AS type \
5049 FROM tickets) type \
5053 InstancePrefix "rt36_tickets"
5054 InstancesFrom "type"
5060 Statement "SELECT collectd_insert($1, $2, $3, $4, $5, $6, $7, $8, $9);"
5070 KRBSrvName "kerberos_service_name"
5076 Service "service_name"
5077 Query backend # predefined
5088 The B<Query> block defines one database query which may later be used by a
5089 database definition. It accepts a single mandatory argument which specifies
5090 the name of the query. The names of all queries have to be unique (see the
5091 B<MinVersion> and B<MaxVersion> options below for an exception to this
5092 rule). The following configuration options are available to define the query:
5094 In each B<Query> block, there is one or more B<Result> blocks. B<Result>
5095 blocks define how to handle the values returned from the query. They define
5096 which column holds which value and how to dispatch that value to the daemon.
5097 Multiple B<Result> blocks may be used to extract multiple values from a single
5102 =item B<Statement> I<sql query statement>
5104 Specify the I<sql query statement> which the plugin should execute. The string
5105 may contain the tokens B<$1>, B<$2>, etc. which are used to reference the
5106 first, second, etc. parameter. The value of the parameters is specified by the
5107 B<Param> configuration option - see below for details. To include a literal
5108 B<$> character followed by a number, surround it with single quotes (B<'>).
5110 Any SQL command which may return data (such as C<SELECT> or C<SHOW>) is
5111 allowed. Note, however, that only a single command may be used. Semicolons are
5112 allowed as long as a single non-empty command has been specified only.
5114 The returned lines will be handled separately one after another.
5116 =item B<Param> I<hostname>|I<database>|I<username>|I<interval>
5118 Specify the parameters which should be passed to the SQL query. The parameters
5119 are referred to in the SQL query as B<$1>, B<$2>, etc. in the same order as
5120 they appear in the configuration file. The value of the parameter is
5121 determined depending on the value of the B<Param> option as follows:
5127 The configured hostname of the database connection. If a UNIX domain socket is
5128 used, the parameter expands to "localhost".
5132 The name of the database of the current connection.
5136 The name of the database plugin instance. See the B<Instance> option of the
5137 database specification below for details.
5141 The username used to connect to the database.
5145 The interval with which this database is queried (as specified by the database
5146 specific or global B<Interval> options).
5150 Please note that parameters are only supported by PostgreSQL's protocol
5151 version 3 and above which was introduced in version 7.4 of PostgreSQL.
5153 =item B<Type> I<type>
5155 The I<type> name to be used when dispatching the values. The type describes
5156 how to handle the data and where to store it. See L<types.db(5)> for more
5157 details on types and their configuration. The number and type of values (as
5158 selected by the B<ValuesFrom> option) has to match the type of the given name.
5160 This option is required inside a B<Result> block.
5162 =item B<InstancePrefix> I<prefix>
5164 =item B<InstancesFrom> I<column0> [I<column1> ...]
5166 Specify how to create the "TypeInstance" for each data set (i.E<nbsp>e. line).
5167 B<InstancePrefix> defines a static prefix that will be prepended to all type
5168 instances. B<InstancesFrom> defines the column names whose values will be used
5169 to create the type instance. Multiple values will be joined together using the
5170 hyphen (C<->) as separation character.
5172 The plugin itself does not check whether or not all built instances are
5173 different. It is your responsibility to assure that each is unique.
5175 Both options are optional. If none is specified, the type instance will be
5178 =item B<ValuesFrom> I<column0> [I<column1> ...]
5180 Names the columns whose content is used as the actual data for the data sets
5181 that are dispatched to the daemon. How many such columns you need is
5182 determined by the B<Type> setting as explained above. If you specify too many
5183 or not enough columns, the plugin will complain about that and no data will be
5184 submitted to the daemon.
5186 The actual data type, as seen by PostgreSQL, is not that important as long as
5187 it represents numbers. The plugin will automatically cast the values to the
5188 right type if it know how to do that. For that, it uses the L<strtoll(3)> and
5189 L<strtod(3)> functions, so anything supported by those functions is supported
5190 by the plugin as well.
5192 This option is required inside a B<Result> block and may be specified multiple
5193 times. If multiple B<ValuesFrom> options are specified, the columns are read
5196 =item B<MinVersion> I<version>
5198 =item B<MaxVersion> I<version>
5200 Specify the minimum or maximum version of PostgreSQL that this query should be
5201 used with. Some statistics might only be available with certain versions of
5202 PostgreSQL. This allows you to specify multiple queries with the same name but
5203 which apply to different versions, thus allowing you to use the same
5204 configuration in a heterogeneous environment.
5206 The I<version> has to be specified as the concatenation of the major, minor
5207 and patch-level versions, each represented as two-decimal-digit numbers. For
5208 example, version 8.2.3 will become 80203.
5212 The following predefined queries are available (the definitions can be found
5213 in the F<postgresql_default.conf> file which, by default, is available at
5214 C<I<prefix>/share/collectd/>):
5220 This query collects the number of backends, i.E<nbsp>e. the number of
5223 =item B<transactions>
5225 This query collects the numbers of committed and rolled-back transactions of
5230 This query collects the numbers of various table modifications (i.E<nbsp>e.
5231 insertions, updates, deletions) of the user tables.
5233 =item B<query_plans>
5235 This query collects the numbers of various table scans and returned tuples of
5238 =item B<table_states>
5240 This query collects the numbers of live and dead rows in the user tables.
5244 This query collects disk block access counts for user tables.
5248 This query collects the on-disk size of the database in bytes.
5252 In addition, the following detailed queries are available by default. Please
5253 note that each of those queries collects information B<by table>, thus,
5254 potentially producing B<a lot> of data. For details see the description of the
5255 non-by_table queries above.
5259 =item B<queries_by_table>
5261 =item B<query_plans_by_table>
5263 =item B<table_states_by_table>
5265 =item B<disk_io_by_table>
5269 The B<Writer> block defines a PostgreSQL writer backend. It accepts a single
5270 mandatory argument specifying the name of the writer. This will then be used
5271 in the B<Database> specification in order to activate the writer instance. The
5272 names of all writers have to be unique. The following options may be
5277 =item B<Statement> I<sql statement>
5279 This mandatory option specifies the SQL statement that will be executed for
5280 each submitted value. A single SQL statement is allowed only. Anything after
5281 the first semicolon will be ignored.
5283 Nine parameters will be passed to the statement and should be specified as
5284 tokens B<$1>, B<$2>, through B<$9> in the statement string. The following
5285 values are made available through those parameters:
5291 The timestamp of the queried value as a floating point number.
5295 The hostname of the queried value.
5299 The plugin name of the queried value.
5303 The plugin instance of the queried value. This value may be B<NULL> if there
5304 is no plugin instance.
5308 The type of the queried value (cf. L<types.db(5)>).
5312 The type instance of the queried value. This value may be B<NULL> if there is
5317 An array of names for the submitted values (i.E<nbsp>e., the name of the data
5318 sources of the submitted value-list).
5322 An array of types for the submitted values (i.E<nbsp>e., the type of the data
5323 sources of the submitted value-list; C<counter>, C<gauge>, ...). Note, that if
5324 B<StoreRates> is enabled (which is the default, see below), all types will be
5329 An array of the submitted values. The dimensions of the value name and value
5334 In general, it is advisable to create and call a custom function in the
5335 PostgreSQL database for this purpose. Any procedural language supported by
5336 PostgreSQL will do (see chapter "Server Programming" in the PostgreSQL manual
5339 =item B<StoreRates> B<false>|B<true>
5341 If set to B<true> (the default), convert counter values to rates. If set to
5342 B<false> counter values are stored as is, i.E<nbsp>e. as an increasing integer
5347 The B<Database> block defines one PostgreSQL database for which to collect
5348 statistics. It accepts a single mandatory argument which specifies the
5349 database name. None of the other options are required. PostgreSQL will use
5350 default values as documented in the section "CONNECTING TO A DATABASE" in the
5351 L<psql(1)> manpage. However, be aware that those defaults may be influenced by
5352 the user collectd is run as and special environment variables. See the manpage
5357 =item B<Interval> I<seconds>
5359 Specify the interval with which the database should be queried. The default is
5360 to use the global B<Interval> setting.
5362 =item B<CommitInterval> I<seconds>
5364 This option may be used for database connections which have "writers" assigned
5365 (see above). If specified, it causes a writer to put several updates into a
5366 single transaction. This transaction will last for the specified amount of
5367 time. By default, each update will be executed in a separate transaction. Each
5368 transaction generates a fair amount of overhead which can, thus, be reduced by
5369 activating this option. The draw-back is, that data covering the specified
5370 amount of time will be lost, for example, if a single statement within the
5371 transaction fails or if the database server crashes.
5373 =item B<Instance> I<name>
5375 Specify the plugin instance name that should be used instead of the database
5376 name (which is the default, if this option has not been specified). This
5377 allows to query multiple databases of the same name on the same host (e.g.
5378 when running multiple database server versions in parallel).
5380 =item B<Host> I<hostname>
5382 Specify the hostname or IP of the PostgreSQL server to connect to. If the
5383 value begins with a slash, it is interpreted as the directory name in which to
5384 look for the UNIX domain socket.
5386 This option is also used to determine the hostname that is associated with a
5387 collected data set. If it has been omitted or either begins with with a slash
5388 or equals B<localhost> it will be replaced with the global hostname definition
5389 of collectd. Any other value will be passed literally to collectd when
5390 dispatching values. Also see the global B<Hostname> and B<FQDNLookup> options.
5392 =item B<Port> I<port>
5394 Specify the TCP port or the local UNIX domain socket file extension of the
5397 =item B<User> I<username>
5399 Specify the username to be used when connecting to the server.
5401 =item B<Password> I<password>
5403 Specify the password to be used when connecting to the server.
5405 =item B<ExpireDelay> I<delay>
5407 Skip expired values in query output.
5409 =item B<SSLMode> I<disable>|I<allow>|I<prefer>|I<require>
5411 Specify whether to use an SSL connection when contacting the server. The
5412 following modes are supported:
5418 Do not use SSL at all.
5422 First, try to connect without using SSL. If that fails, try using SSL.
5424 =item I<prefer> (default)
5426 First, try to connect using SSL. If that fails, try without using SSL.
5434 =item B<Instance> I<name>
5436 Specify the plugin instance name that should be used instead of the database
5437 name (which is the default, if this option has not been specified). This
5438 allows to query multiple databases of the same name on the same host (e.g.
5439 when running multiple database server versions in parallel).
5441 =item B<KRBSrvName> I<kerberos_service_name>
5443 Specify the Kerberos service name to use when authenticating with Kerberos 5
5444 or GSSAPI. See the sections "Kerberos authentication" and "GSSAPI" of the
5445 B<PostgreSQL Documentation> for details.
5447 =item B<Service> I<service_name>
5449 Specify the PostgreSQL service name to use for additional parameters. That
5450 service has to be defined in F<pg_service.conf> and holds additional
5451 connection parameters. See the section "The Connection Service File" in the
5452 B<PostgreSQL Documentation> for details.
5454 =item B<Query> I<query>
5456 Specifies a I<query> which should be executed in the context of the database
5457 connection. This may be any of the predefined or user-defined queries. If no
5458 such option is given, it defaults to "backends", "transactions", "queries",
5459 "query_plans", "table_states", "disk_io" and "disk_usage" (unless a B<Writer>
5460 has been specified). Else, the specified queries are used only.
5462 =item B<Writer> I<writer>
5464 Assigns the specified I<writer> backend to the database connection. This
5465 causes all collected data to be send to the database using the settings
5466 defined in the writer configuration (see the section "FILTER CONFIGURATION"
5467 below for details on how to selectively send data to certain plugins).
5469 Each writer will register a flush callback which may be used when having long
5470 transactions enabled (see the B<CommitInterval> option above). When issuing
5471 the B<FLUSH> command (see L<collectd-unixsock(5)> for details) the current
5472 transaction will be committed right away. Two different kinds of flush
5473 callbacks are available with the C<postgresql> plugin:
5479 Flush all writer backends.
5481 =item B<postgresql->I<database>
5483 Flush all writers of the specified I<database> only.
5489 =head2 Plugin C<powerdns>
5491 The C<powerdns> plugin queries statistics from an authoritative PowerDNS
5492 nameserver and/or a PowerDNS recursor. Since both offer a wide variety of
5493 values, many of which are probably meaningless to most users, but may be useful
5494 for some. So you may chose which values to collect, but if you don't, some
5495 reasonable defaults will be collected.
5498 <Server "server_name">
5500 Collect "udp-answers" "udp-queries"
5501 Socket "/var/run/pdns.controlsocket"
5503 <Recursor "recursor_name">
5505 Collect "cache-hits" "cache-misses"
5506 Socket "/var/run/pdns_recursor.controlsocket"
5508 LocalSocket "/opt/collectd/var/run/collectd-powerdns"
5513 =item B<Server> and B<Recursor> block
5515 The B<Server> block defines one authoritative server to query, the B<Recursor>
5516 does the same for an recursing server. The possible options in both blocks are
5517 the same, though. The argument defines a name for the serverE<nbsp>/ recursor
5522 =item B<Collect> I<Field>
5524 Using the B<Collect> statement you can select which values to collect. Here,
5525 you specify the name of the values as used by the PowerDNS servers, e.E<nbsp>g.
5526 C<dlg-only-drops>, C<answers10-100>.
5528 The method of getting the values differs for B<Server> and B<Recursor> blocks:
5529 When querying the server a C<SHOW *> command is issued in any case, because
5530 that's the only way of getting multiple values out of the server at once.
5531 collectd then picks out the values you have selected. When querying the
5532 recursor, a command is generated to query exactly these values. So if you
5533 specify invalid fields when querying the recursor, a syntax error may be
5534 returned by the daemon and collectd may not collect any values at all.
5536 If no B<Collect> statement is given, the following B<Server> values will be
5543 =item packetcache-hit
5545 =item packetcache-miss
5547 =item packetcache-size
5549 =item query-cache-hit
5551 =item query-cache-miss
5553 =item recursing-answers
5555 =item recursing-questions
5567 The following B<Recursor> values will be collected by default:
5571 =item noerror-answers
5573 =item nxdomain-answers
5575 =item servfail-answers
5593 Please note that up to that point collectd doesn't know what values are
5594 available on the server and values that are added do not need a change of the
5595 mechanism so far. However, the values must be mapped to collectd's naming
5596 scheme, which is done using a lookup table that lists all known values. If
5597 values are added in the future and collectd does not know about them, you will
5598 get an error much like this:
5600 powerdns plugin: submit: Not found in lookup table: foobar = 42
5602 In this case please file a bug report with the collectd team.
5604 =item B<Socket> I<Path>
5606 Configures the path to the UNIX domain socket to be used when connecting to the
5607 daemon. By default C<${localstatedir}/run/pdns.controlsocket> will be used for
5608 an authoritative server and C<${localstatedir}/run/pdns_recursor.controlsocket>
5609 will be used for the recursor.
5613 =item B<LocalSocket> I<Path>
5615 Querying the recursor is done using UDP. When using UDP over UNIX domain
5616 sockets, the client socket needs a name in the file system, too. You can set
5617 this local name to I<Path> using the B<LocalSocket> option. The default is
5618 C<I<prefix>/var/run/collectd-powerdns>.
5622 =head2 Plugin C<processes>
5626 =item B<Process> I<Name>
5628 Select more detailed statistics of processes matching this name. The statistics
5629 collected for these selected processes are size of the resident segment size
5630 (RSS), user- and system-time used, number of processes and number of threads,
5631 io data (where available) and minor and major pagefaults.
5633 =item B<ProcessMatch> I<name> I<regex>
5635 Similar to the B<Process> option this allows to select more detailed
5636 statistics of processes matching the specified I<regex> (see L<regex(7)> for
5637 details). The statistics of all matching processes are summed up and
5638 dispatched to the daemon using the specified I<name> as an identifier. This
5639 allows to "group" several processes together. I<name> must not contain
5642 =item B<CollectContextSwitch> I<Boolean>
5644 Collect context switch of the process.
5648 =head2 Plugin C<protocols>
5650 Collects a lot of information about various network protocols, such as I<IP>,
5651 I<TCP>, I<UDP>, etc.
5653 Available configuration options:
5657 =item B<Value> I<Selector>
5659 Selects whether or not to select a specific value. The string being matched is
5660 of the form "I<Protocol>:I<ValueName>", where I<Protocol> will be used as the
5661 plugin instance and I<ValueName> will be used as type instance. An example of
5662 the string being used would be C<Tcp:RetransSegs>.
5664 You can use regular expressions to match a large number of values with just one
5665 configuration option. To select all "extended" I<TCP> values, you could use the
5666 following statement:
5670 Whether only matched values are selected or all matched values are ignored
5671 depends on the B<IgnoreSelected>. By default, only matched values are selected.
5672 If no value is configured at all, all values will be selected.
5674 =item B<IgnoreSelected> B<true>|B<false>
5676 If set to B<true>, inverts the selection made by B<Value>, i.E<nbsp>e. all
5677 matching values will be ignored.
5681 =head2 Plugin C<python>
5683 This plugin embeds a Python-interpreter into collectd and provides an interface
5684 to collectd's plugin system. See L<collectd-python(5)> for its documentation.
5686 =head2 Plugin C<routeros>
5688 The C<routeros> plugin connects to a device running I<RouterOS>, the
5689 Linux-based operating system for routers by I<MikroTik>. The plugin uses
5690 I<librouteros> to connect and reads information about the interfaces and
5691 wireless connections of the device. The configuration supports querying
5696 Host "router0.example.com"
5699 CollectInterface true
5704 Host "router1.example.com"
5707 CollectInterface true
5708 CollectRegistrationTable true
5714 As you can see above, the configuration of the I<routeros> plugin consists of
5715 one or more B<E<lt>RouterE<gt>> blocks. Within each block, the following
5716 options are understood:
5720 =item B<Host> I<Host>
5722 Hostname or IP-address of the router to connect to.
5724 =item B<Port> I<Port>
5726 Port name or port number used when connecting. If left unspecified, the default
5727 will be chosen by I<librouteros>, currently "8728". This option expects a
5728 string argument, even when a numeric port number is given.
5730 =item B<User> I<User>
5732 Use the user name I<User> to authenticate. Defaults to "admin".
5734 =item B<Password> I<Password>
5736 Set the password used to authenticate.
5738 =item B<CollectInterface> B<true>|B<false>
5740 When set to B<true>, interface statistics will be collected for all interfaces
5741 present on the device. Defaults to B<false>.
5743 =item B<CollectRegistrationTable> B<true>|B<false>
5745 When set to B<true>, information about wireless LAN connections will be
5746 collected. Defaults to B<false>.
5748 =item B<CollectCPULoad> B<true>|B<false>
5750 When set to B<true>, information about the CPU usage will be collected. The
5751 number is a dimensionless value where zero indicates no CPU usage at all.
5752 Defaults to B<false>.
5754 =item B<CollectMemory> B<true>|B<false>
5756 When enabled, the amount of used and free memory will be collected. How used
5757 memory is calculated is unknown, for example whether or not caches are counted
5759 Defaults to B<false>.
5761 =item B<CollectDF> B<true>|B<false>
5763 When enabled, the amount of used and free disk space will be collected.
5764 Defaults to B<false>.
5766 =item B<CollectDisk> B<true>|B<false>
5768 When enabled, the number of sectors written and bad blocks will be collected.
5769 Defaults to B<false>.
5773 =head2 Plugin C<redis>
5775 The I<Redis plugin> connects to one or more Redis servers and gathers
5776 information about each server's state. For each server there is a I<Node> block
5777 which configures the connection parameters for this node.
5784 <Query "LLEN myqueue">
5791 The information shown in the synopsis above is the I<default configuration>
5792 which is used by the plugin if no configuration is present.
5796 =item B<Node> I<Nodename>
5798 The B<Node> block identifies a new Redis node, that is a new Redis instance
5799 running in an specified host and port. The name for node is a canonical
5800 identifier which is used as I<plugin instance>. It is limited to
5801 64E<nbsp>characters in length.
5803 =item B<Host> I<Hostname>
5805 The B<Host> option is the hostname or IP-address where the Redis instance is
5808 =item B<Port> I<Port>
5810 The B<Port> option is the TCP port on which the Redis instance accepts
5811 connections. Either a service name of a port number may be given. Please note
5812 that numerical port numbers must be given as a string, too.
5814 =item B<Password> I<Password>
5816 Use I<Password> to authenticate when connecting to I<Redis>.
5818 =item B<Timeout> I<Milliseconds>
5820 The B<Timeout> option set the socket timeout for node response. Since the Redis
5821 read function is blocking, you should keep this value as low as possible. Keep
5822 in mind that the sum of all B<Timeout> values for all B<Nodes> should be lower
5823 than B<Interval> defined globally.
5825 =item B<Query> I<Querystring>
5827 The B<Query> block identifies a query to execute against the redis server.
5828 There may be an arbitrary number of queries to execute.
5830 =item B<Type> I<Collectd type>
5832 Within a query definition, a valid collectd type to use as when submitting
5833 the result of the query. When not supplied, will default to B<gauge>.
5835 =item B<Instance> I<Type instance>
5837 Within a query definition, an optional type instance to use when submitting
5838 the result of the query. When not supplied will default to the escaped
5839 command, up to 64 chars.
5843 =head2 Plugin C<rrdcached>
5845 The C<rrdcached> plugin uses the RRDtool accelerator daemon, L<rrdcached(1)>,
5846 to store values to RRD files in an efficient manner. The combination of the
5847 C<rrdcached> B<plugin> and the C<rrdcached> B<daemon> is very similar to the
5848 way the C<rrdtool> plugin works (see below). The added abstraction layer
5849 provides a number of benefits, though: Because the cache is not within
5850 C<collectd> anymore, it does not need to be flushed when C<collectd> is to be
5851 restarted. This results in much shorter (if any) gaps in graphs, especially
5852 under heavy load. Also, the C<rrdtool> command line utility is aware of the
5853 daemon so that it can flush values to disk automatically when needed. This
5854 allows to integrate automated flushing of values into graphing solutions much
5857 There are disadvantages, though: The daemon may reside on a different host, so
5858 it may not be possible for C<collectd> to create the appropriate RRD files
5859 anymore. And even if C<rrdcached> runs on the same host, it may run in a
5860 different base directory, so relative paths may do weird stuff if you're not
5863 So the B<recommended configuration> is to let C<collectd> and C<rrdcached> run
5864 on the same host, communicating via a UNIX domain socket. The B<DataDir>
5865 setting should be set to an absolute path, so that a changed base directory
5866 does not result in RRD files being createdE<nbsp>/ expected in the wrong place.
5870 =item B<DaemonAddress> I<Address>
5872 Address of the daemon as understood by the C<rrdc_connect> function of the RRD
5873 library. See L<rrdcached(1)> for details. Example:
5875 <Plugin "rrdcached">
5876 DaemonAddress "unix:/var/run/rrdcached.sock"
5879 =item B<DataDir> I<Directory>
5881 Set the base directory in which the RRD files reside. If this is a relative
5882 path, it is relative to the working base directory of the C<rrdcached> daemon!
5883 Use of an absolute path is recommended.
5885 =item B<CreateFiles> B<true>|B<false>
5887 Enables or disables the creation of RRD files. If the daemon is not running
5888 locally, or B<DataDir> is set to a relative path, this will not work as
5889 expected. Default is B<true>.
5891 =item B<CreateFilesAsync> B<false>|B<true>
5893 When enabled, new RRD files are enabled asynchronously, using a separate thread
5894 that runs in the background. This prevents writes to block, which is a problem
5895 especially when many hundreds of files need to be created at once. However,
5896 since the purpose of creating the files asynchronously is I<not> to block until
5897 the file is available, values before the file is available will be discarded.
5898 When disabled (the default) files are created synchronously, blocking for a
5899 short while, while the file is being written.
5901 =item B<StepSize> I<Seconds>
5903 B<Force> the stepsize of newly created RRD-files. Ideally (and per default)
5904 this setting is unset and the stepsize is set to the interval in which the data
5905 is collected. Do not use this option unless you absolutely have to for some
5906 reason. Setting this option may cause problems with the C<snmp plugin>, the
5907 C<exec plugin> or when the daemon is set up to receive data from other hosts.
5909 =item B<HeartBeat> I<Seconds>
5911 B<Force> the heartbeat of newly created RRD-files. This setting should be unset
5912 in which case the heartbeat is set to twice the B<StepSize> which should equal
5913 the interval in which data is collected. Do not set this option unless you have
5914 a very good reason to do so.
5916 =item B<RRARows> I<NumRows>
5918 The C<rrdtool plugin> calculates the number of PDPs per CDP based on the
5919 B<StepSize>, this setting and a timespan. This plugin creates RRD-files with
5920 three times five RRAs, i. e. five RRAs with the CFs B<MIN>, B<AVERAGE>, and
5921 B<MAX>. The five RRAs are optimized for graphs covering one hour, one day, one
5922 week, one month, and one year.
5924 So for each timespan, it calculates how many PDPs need to be consolidated into
5925 one CDP by calculating:
5926 number of PDPs = timespan / (stepsize * rrarows)
5928 Bottom line is, set this no smaller than the width of you graphs in pixels. The
5931 =item B<RRATimespan> I<Seconds>
5933 Adds an RRA-timespan, given in seconds. Use this option multiple times to have
5934 more then one RRA. If this option is never used, the built-in default of (3600,
5935 86400, 604800, 2678400, 31622400) is used.
5937 For more information on how RRA-sizes are calculated see B<RRARows> above.
5939 =item B<XFF> I<Factor>
5941 Set the "XFiles Factor". The default is 0.1. If unsure, don't set this option.
5942 I<Factor> must be in the range C<[0.0-1.0)>, i.e. between zero (inclusive) and
5945 =item B<CollectStatistics> B<false>|B<true>
5947 When set to B<true>, various statistics about the I<rrdcached> daemon will be
5948 collected, with "rrdcached" as the I<plugin name>. Defaults to B<false>.
5950 Statistics are read via I<rrdcached>s socket using the STATS command.
5951 See L<rrdcached(1)> for details.
5955 =head2 Plugin C<rrdtool>
5957 You can use the settings B<StepSize>, B<HeartBeat>, B<RRARows>, and B<XFF> to
5958 fine-tune your RRD-files. Please read L<rrdcreate(1)> if you encounter problems
5959 using these settings. If you don't want to dive into the depths of RRDtool, you
5960 can safely ignore these settings.
5964 =item B<DataDir> I<Directory>
5966 Set the directory to store RRD files under. By default RRD files are generated
5967 beneath the daemon's working directory, i.e. the B<BaseDir>.
5969 =item B<CreateFilesAsync> B<false>|B<true>
5971 When enabled, new RRD files are enabled asynchronously, using a separate thread
5972 that runs in the background. This prevents writes to block, which is a problem
5973 especially when many hundreds of files need to be created at once. However,
5974 since the purpose of creating the files asynchronously is I<not> to block until
5975 the file is available, values before the file is available will be discarded.
5976 When disabled (the default) files are created synchronously, blocking for a
5977 short while, while the file is being written.
5979 =item B<StepSize> I<Seconds>
5981 B<Force> the stepsize of newly created RRD-files. Ideally (and per default)
5982 this setting is unset and the stepsize is set to the interval in which the data
5983 is collected. Do not use this option unless you absolutely have to for some
5984 reason. Setting this option may cause problems with the C<snmp plugin>, the
5985 C<exec plugin> or when the daemon is set up to receive data from other hosts.
5987 =item B<HeartBeat> I<Seconds>
5989 B<Force> the heartbeat of newly created RRD-files. This setting should be unset
5990 in which case the heartbeat is set to twice the B<StepSize> which should equal
5991 the interval in which data is collected. Do not set this option unless you have
5992 a very good reason to do so.
5994 =item B<RRARows> I<NumRows>
5996 The C<rrdtool plugin> calculates the number of PDPs per CDP based on the
5997 B<StepSize>, this setting and a timespan. This plugin creates RRD-files with
5998 three times five RRAs, i.e. five RRAs with the CFs B<MIN>, B<AVERAGE>, and
5999 B<MAX>. The five RRAs are optimized for graphs covering one hour, one day, one
6000 week, one month, and one year.
6002 So for each timespan, it calculates how many PDPs need to be consolidated into
6003 one CDP by calculating:
6004 number of PDPs = timespan / (stepsize * rrarows)
6006 Bottom line is, set this no smaller than the width of you graphs in pixels. The
6009 =item B<RRATimespan> I<Seconds>
6011 Adds an RRA-timespan, given in seconds. Use this option multiple times to have
6012 more then one RRA. If this option is never used, the built-in default of (3600,
6013 86400, 604800, 2678400, 31622400) is used.
6015 For more information on how RRA-sizes are calculated see B<RRARows> above.
6017 =item B<XFF> I<Factor>
6019 Set the "XFiles Factor". The default is 0.1. If unsure, don't set this option.
6020 I<Factor> must be in the range C<[0.0-1.0)>, i.e. between zero (inclusive) and
6023 =item B<CacheFlush> I<Seconds>
6025 When the C<rrdtool> plugin uses a cache (by setting B<CacheTimeout>, see below)
6026 it writes all values for a certain RRD-file if the oldest value is older than
6027 (or equal to) the number of seconds specified. If some RRD-file is not updated
6028 anymore for some reason (the computer was shut down, the network is broken,
6029 etc.) some values may still be in the cache. If B<CacheFlush> is set, then the
6030 entire cache is searched for entries older than B<CacheTimeout> seconds and
6031 written to disk every I<Seconds> seconds. Since this is kind of expensive and
6032 does nothing under normal circumstances, this value should not be too small.
6033 900 seconds might be a good value, though setting this to 7200 seconds doesn't
6034 normally do much harm either.
6036 =item B<CacheTimeout> I<Seconds>
6038 If this option is set to a value greater than zero, the C<rrdtool plugin> will
6039 save values in a cache, as described above. Writing multiple values at once
6040 reduces IO-operations and thus lessens the load produced by updating the files.
6041 The trade off is that the graphs kind of "drag behind" and that more memory is
6044 =item B<WritesPerSecond> I<Updates>
6046 When collecting many statistics with collectd and the C<rrdtool> plugin, you
6047 will run serious performance problems. The B<CacheFlush> setting and the
6048 internal update queue assert that collectd continues to work just fine even
6049 under heavy load, but the system may become very unresponsive and slow. This is
6050 a problem especially if you create graphs from the RRD files on the same
6051 machine, for example using the C<graph.cgi> script included in the
6052 C<contrib/collection3/> directory.
6054 This setting is designed for very large setups. Setting this option to a value
6055 between 25 and 80 updates per second, depending on your hardware, will leave
6056 the server responsive enough to draw graphs even while all the cached values
6057 are written to disk. Flushed values, i.E<nbsp>e. values that are forced to disk
6058 by the B<FLUSH> command, are B<not> effected by this limit. They are still
6059 written as fast as possible, so that web frontends have up to date data when
6062 For example: If you have 100,000 RRD files and set B<WritesPerSecond> to 30
6063 updates per second, writing all values to disk will take approximately
6064 56E<nbsp>minutes. Together with the flushing ability that's integrated into
6065 "collection3" you'll end up with a responsive and fast system, up to date
6066 graphs and basically a "backup" of your values every hour.
6068 =item B<RandomTimeout> I<Seconds>
6070 When set, the actual timeout for each value is chosen randomly between
6071 I<CacheTimeout>-I<RandomTimeout> and I<CacheTimeout>+I<RandomTimeout>. The
6072 intention is to avoid high load situations that appear when many values timeout
6073 at the same time. This is especially a problem shortly after the daemon starts,
6074 because all values were added to the internal cache at roughly the same time.
6078 =head2 Plugin C<sensors>
6080 The I<Sensors plugin> uses B<lm_sensors> to retrieve sensor-values. This means
6081 that all the needed modules have to be loaded and lm_sensors has to be
6082 configured (most likely by editing F</etc/sensors.conf>. Read
6083 L<sensors.conf(5)> for details.
6085 The B<lm_sensors> homepage can be found at
6086 L<http://secure.netroedge.com/~lm78/>.
6090 =item B<SensorConfigFile> I<File>
6092 Read the I<lm_sensors> configuration from I<File>. When unset (recommended),
6093 the library's default will be used.
6095 =item B<Sensor> I<chip-bus-address/type-feature>
6097 Selects the name of the sensor which you want to collect or ignore, depending
6098 on the B<IgnoreSelected> below. For example, the option "B<Sensor>
6099 I<it8712-isa-0290/voltage-in1>" will cause collectd to gather data for the
6100 voltage sensor I<in1> of the I<it8712> on the isa bus at the address 0290.
6102 =item B<IgnoreSelected> I<true>|I<false>
6104 If no configuration if given, the B<sensors>-plugin will collect data from all
6105 sensors. This may not be practical, especially for uninteresting sensors.
6106 Thus, you can use the B<Sensor>-option to pick the sensors you're interested
6107 in. Sometimes, however, it's easier/preferred to collect all sensors I<except> a
6108 few ones. This option enables you to do that: By setting B<IgnoreSelected> to
6109 I<true> the effect of B<Sensor> is inverted: All selected sensors are ignored
6110 and all other sensors are collected.
6114 =head2 Plugin C<sigrok>
6116 The I<sigrok plugin> uses I<libsigrok> to retrieve measurements from any device
6117 supported by the L<sigrok|http://sigrok.org/> project.
6123 <Device "AC Voltage">
6128 <Device "Sound Level">
6129 Driver "cem-dt-885x"
6136 =item B<LogLevel> B<0-5>
6138 The I<sigrok> logging level to pass on to the I<collectd> log, as a number
6139 between B<0> and B<5> (inclusive). These levels correspond to C<None>,
6140 C<Errors>, C<Warnings>, C<Informational>, C<Debug >and C<Spew>, respectively.
6141 The default is B<2> (C<Warnings>). The I<sigrok> log messages, regardless of
6142 their level, are always submitted to I<collectd> at its INFO log level.
6144 =item E<lt>B<Device> I<Name>E<gt>
6146 A sigrok-supported device, uniquely identified by this section's options. The
6147 I<Name> is passed to I<collectd> as the I<plugin instance>.
6149 =item B<Driver> I<DriverName>
6151 The sigrok driver to use for this device.
6153 =item B<Conn> I<ConnectionSpec>
6155 If the device cannot be auto-discovered, or more than one might be discovered
6156 by the driver, I<ConnectionSpec> specifies the connection string to the device.
6157 It can be of the form of a device path (e.g.E<nbsp>C</dev/ttyUSB2>), or, in
6158 case of a non-serial USB-connected device, the USB I<VendorID>B<.>I<ProductID>
6159 separated by a period (e.g.E<nbsp>C<0403.6001>). A USB device can also be
6160 specified as I<Bus>B<.>I<Address> (e.g.E<nbsp>C<1.41>).
6162 =item B<SerialComm> I<SerialSpec>
6164 For serial devices with non-standard port settings, this option can be used
6165 to specify them in a form understood by I<sigrok>, e.g.E<nbsp>C<9600/8n1>.
6166 This should not be necessary; drivers know how to communicate with devices they
6169 =item B<MinimumInterval> I<Seconds>
6171 Specifies the minimum time between measurement dispatches to I<collectd>, in
6172 seconds. Since some I<sigrok> supported devices can acquire measurements many
6173 times per second, it may be necessary to throttle these. For example, the
6174 I<RRD plugin> cannot process writes more than once per second.
6176 The default B<MinimumInterval> is B<0>, meaning measurements received from the
6177 device are always dispatched to I<collectd>. When throttled, unused
6178 measurements are discarded.
6182 =head2 Plugin C<smart>
6184 The C<smart> plugin collects SMART information from physical
6185 disks. Values collectd include temperature, power cycle count, poweron
6186 time and bad sectors. Also, all SMART attributes are collected along
6187 with the normalized current value, the worst value, the threshold and
6188 a human readable value.
6190 Using the following two options you can ignore some disks or configure the
6191 collection only of specific disks.
6195 =item B<Disk> I<Name>
6197 Select the disk I<Name>. Whether it is collected or ignored depends on the
6198 B<IgnoreSelected> setting, see below. As with other plugins that use the
6199 daemon's ignorelist functionality, a string that starts and ends with a slash
6200 is interpreted as a regular expression. Examples:
6205 =item B<IgnoreSelected> B<true>|B<false>
6207 Sets whether selected disks, i.E<nbsp>e. the ones matches by any of the B<Disk>
6208 statements, are ignored or if all other disks are ignored. The behavior
6209 (hopefully) is intuitive: If no B<Disk> option is configured, all disks are
6210 collected. If at least one B<Disk> option is given and no B<IgnoreSelected> or
6211 set to B<false>, B<only> matching disks will be collected. If B<IgnoreSelected>
6212 is set to B<true>, all disks are collected B<except> the ones matched.
6216 =head2 Plugin C<snmp>
6218 Since the configuration of the C<snmp plugin> is a little more complicated than
6219 other plugins, its documentation has been moved to an own manpage,
6220 L<collectd-snmp(5)>. Please see there for details.
6222 =head2 Plugin C<statsd>
6224 The I<statsd plugin> listens to a UDP socket, reads "events" in the statsd
6225 protocol and dispatches rates or other aggregates of these numbers
6228 The plugin implements the I<Counter>, I<Timer>, I<Gauge> and I<Set> types which
6229 are dispatched as the I<collectd> types C<derive>, C<latency>, C<gauge> and
6230 C<objects> respectively.
6232 The following configuration options are valid:
6236 =item B<Host> I<Host>
6238 Bind to the hostname / address I<Host>. By default, the plugin will bind to the
6239 "any" address, i.e. accept packets sent to any of the hosts addresses.
6241 =item B<Port> I<Port>
6243 UDP port to listen to. This can be either a service name or a port number.
6244 Defaults to C<8125>.
6246 =item B<DeleteCounters> B<false>|B<true>
6248 =item B<DeleteTimers> B<false>|B<true>
6250 =item B<DeleteGauges> B<false>|B<true>
6252 =item B<DeleteSets> B<false>|B<true>
6254 These options control what happens if metrics are not updated in an interval.
6255 If set to B<False>, the default, metrics are dispatched unchanged, i.e. the
6256 rate of counters and size of sets will be zero, timers report C<NaN> and gauges
6257 are unchanged. If set to B<True>, the such metrics are not dispatched and
6258 removed from the internal cache.
6260 =item B<TimerPercentile> I<Percent>
6262 Calculate and dispatch the configured percentile, i.e. compute the latency, so
6263 that I<Percent> of all reported timers are smaller than or equal to the
6264 computed latency. This is useful for cutting off the long tail latency, as it's
6265 often done in I<Service Level Agreements> (SLAs).
6267 Different percentiles can be calculated by setting this option several times.
6268 If none are specified, no percentiles are calculated / dispatched.
6270 =item B<TimerLower> B<false>|B<true>
6272 =item B<TimerUpper> B<false>|B<true>
6274 =item B<TimerSum> B<false>|B<true>
6276 =item B<TimerCount> B<false>|B<true>
6278 Calculate and dispatch various values out of I<Timer> metrics received during
6279 an interval. If set to B<False>, the default, these values aren't calculated /
6284 =head2 Plugin C<swap>
6286 The I<Swap plugin> collects information about used and available swap space. On
6287 I<Linux> and I<Solaris>, the following options are available:
6291 =item B<ReportByDevice> B<false>|B<true>
6293 Configures how to report physical swap devices. If set to B<false> (the
6294 default), the summary over all swap devices is reported only, i.e. the globally
6295 used and available space over all devices. If B<true> is configured, the used
6296 and available space of each device will be reported separately.
6298 This option is only available if the I<Swap plugin> can read C</proc/swaps>
6299 (under Linux) or use the L<swapctl(2)> mechanism (under I<Solaris>).
6301 =item B<ReportBytes> B<false>|B<true>
6303 When enabled, the I<swap I/O> is reported in bytes. When disabled, the default,
6304 I<swap I/O> is reported in pages. This option is available under Linux only.
6306 =item B<ValuesAbsolute> B<true>|B<false>
6308 Enables or disables reporting of absolute swap metrics, i.e. number of I<bytes>
6309 available and used. Defaults to B<true>.
6311 =item B<ValuesPercentage> B<false>|B<true>
6313 Enables or disables reporting of relative swap metrics, i.e. I<percent>
6314 available and free. Defaults to B<false>.
6316 This is useful for deploying I<collectd> in a heterogeneous environment, where
6317 swap sizes differ and you want to specify generic thresholds or similar.
6321 =head2 Plugin C<syslog>
6325 =item B<LogLevel> B<debug|info|notice|warning|err>
6327 Sets the log-level. If, for example, set to B<notice>, then all events with
6328 severity B<notice>, B<warning>, or B<err> will be submitted to the
6331 Please note that B<debug> is only available if collectd has been compiled with
6334 =item B<NotifyLevel> B<OKAY>|B<WARNING>|B<FAILURE>
6336 Controls which notifications should be sent to syslog. The default behaviour is
6337 not to send any. Less severe notifications always imply logging more severe
6338 notifications: Setting this to B<OKAY> means all notifications will be sent to
6339 syslog, setting this to B<WARNING> will send B<WARNING> and B<FAILURE>
6340 notifications but will dismiss B<OKAY> notifications. Setting this option to
6341 B<FAILURE> will only send failures to syslog.
6345 =head2 Plugin C<table>
6347 The C<table plugin> provides generic means to parse tabular data and dispatch
6348 user specified values. Values are selected based on column numbers. For
6349 example, this plugin may be used to get values from the Linux L<proc(5)>
6350 filesystem or CSV (comma separated values) files.
6353 <Table "/proc/slabinfo">
6358 InstancePrefix "active_objs"
6364 InstancePrefix "objperslab"
6371 The configuration consists of one or more B<Table> blocks, each of which
6372 configures one file to parse. Within each B<Table> block, there are one or
6373 more B<Result> blocks, which configure which data to select and how to
6376 The following options are available inside a B<Table> block:
6380 =item B<Instance> I<instance>
6382 If specified, I<instance> is used as the plugin instance. So, in the above
6383 example, the plugin name C<table-slabinfo> would be used. If omitted, the
6384 filename of the table is used instead, with all special characters replaced
6385 with an underscore (C<_>).
6387 =item B<Separator> I<string>
6389 Any character of I<string> is interpreted as a delimiter between the different
6390 columns of the table. A sequence of two or more contiguous delimiters in the
6391 table is considered to be a single delimiter, i.E<nbsp>e. there cannot be any
6392 empty columns. The plugin uses the L<strtok_r(3)> function to parse the lines
6393 of a table - see its documentation for more details. This option is mandatory.
6395 A horizontal tab, newline and carriage return may be specified by C<\\t>,
6396 C<\\n> and C<\\r> respectively. Please note that the double backslashes are
6397 required because of collectd's config parsing.
6401 The following options are available inside a B<Result> block:
6405 =item B<Type> I<type>
6407 Sets the type used to dispatch the values to the daemon. Detailed information
6408 about types and their configuration can be found in L<types.db(5)>. This
6409 option is mandatory.
6411 =item B<InstancePrefix> I<prefix>
6413 If specified, prepend I<prefix> to the type instance. If omitted, only the
6414 B<InstancesFrom> option is considered for the type instance.
6416 =item B<InstancesFrom> I<column0> [I<column1> ...]
6418 If specified, the content of the given columns (identified by the column
6419 number starting at zero) will be used to create the type instance for each
6420 row. Multiple values (and the instance prefix) will be joined together with
6421 dashes (I<->) as separation character. If omitted, only the B<InstancePrefix>
6422 option is considered for the type instance.
6424 The plugin itself does not check whether or not all built instances are
6425 different. It’s your responsibility to assure that each is unique. This is
6426 especially true, if you do not specify B<InstancesFrom>: B<You> have to make
6427 sure that the table only contains one row.
6429 If neither B<InstancePrefix> nor B<InstancesFrom> is given, the type instance
6432 =item B<ValuesFrom> I<column0> [I<column1> ...]
6434 Specifies the columns (identified by the column numbers starting at zero)
6435 whose content is used as the actual data for the data sets that are dispatched
6436 to the daemon. How many such columns you need is determined by the B<Type>
6437 setting above. If you specify too many or not enough columns, the plugin will
6438 complain about that and no data will be submitted to the daemon. The plugin
6439 uses L<strtoll(3)> and L<strtod(3)> to parse counter and gauge values
6440 respectively, so anything supported by those functions is supported by the
6441 plugin as well. This option is mandatory.
6445 =head2 Plugin C<tail>
6447 The C<tail plugin> follows logfiles, just like L<tail(1)> does, parses
6448 each line and dispatches found values. What is matched can be configured by the
6449 user using (extended) regular expressions, as described in L<regex(7)>.
6452 <File "/var/log/exim4/mainlog">
6456 Regex "S=([1-9][0-9]*)"
6462 Regex "\\<R=local_user\\>"
6463 ExcludeRegex "\\<R=local_user\\>.*mail_spool defer"
6466 Instance "local_user"
6471 The config consists of one or more B<File> blocks, each of which configures one
6472 logfile to parse. Within each B<File> block, there are one or more B<Match>
6473 blocks, which configure a regular expression to search for.
6475 The B<Instance> option in the B<File> block may be used to set the plugin
6476 instance. So in the above example the plugin name C<tail-foo> would be used.
6477 This plugin instance is for all B<Match> blocks that B<follow> it, until the
6478 next B<Instance> option. This way you can extract several plugin instances from
6479 one logfile, handy when parsing syslog and the like.
6481 The B<Interval> option allows you to define the length of time between reads. If
6482 this is not set, the default Interval will be used.
6484 Each B<Match> block has the following options to describe how the match should
6489 =item B<Regex> I<regex>
6491 Sets the regular expression to use for matching against a line. The first
6492 subexpression has to match something that can be turned into a number by
6493 L<strtoll(3)> or L<strtod(3)>, depending on the value of C<CounterAdd>, see
6494 below. Because B<extended> regular expressions are used, you do not need to use
6495 backslashes for subexpressions! If in doubt, please consult L<regex(7)>. Due to
6496 collectd's config parsing you need to escape backslashes, though. So if you
6497 want to match literal parentheses you need to do the following:
6499 Regex "SPAM \\(Score: (-?[0-9]+\\.[0-9]+)\\)"
6501 =item B<ExcludeRegex> I<regex>
6503 Sets an optional regular expression to use for excluding lines from the match.
6504 An example which excludes all connections from localhost from the match:
6506 ExcludeRegex "127\\.0\\.0\\.1"
6508 =item B<DSType> I<Type>
6510 Sets how the values are cumulated. I<Type> is one of:
6514 =item B<GaugeAverage>
6516 Calculate the average.
6520 Use the smallest number only.
6524 Use the greatest number only.
6528 Use the last number found.
6534 =item B<AbsoluteSet>
6536 The matched number is a counter. Simply I<sets> the internal counter to this
6537 value. Variants exist for C<COUNTER>, C<DERIVE>, and C<ABSOLUTE> data sources.
6545 Add the matched value to the internal counter. In case of B<DeriveAdd>, the
6546 matched number may be negative, which will effectively subtract from the
6555 Increase the internal counter by one. These B<DSType> are the only ones that do
6556 not use the matched subexpression, but simply count the number of matched
6557 lines. Thus, you may use a regular expression without submatch in this case.
6561 As you'd expect the B<Gauge*> types interpret the submatch as a floating point
6562 number, using L<strtod(3)>. The B<Counter*> and B<AbsoluteSet> types interpret
6563 the submatch as an unsigned integer using L<strtoull(3)>. The B<Derive*> types
6564 interpret the submatch as a signed integer using L<strtoll(3)>. B<CounterInc>
6565 and B<DeriveInc> do not use the submatch at all and it may be omitted in this
6568 =item B<Type> I<Type>
6570 Sets the type used to dispatch this value. Detailed information about types and
6571 their configuration can be found in L<types.db(5)>.
6573 =item B<Instance> I<TypeInstance>
6575 This optional setting sets the type instance to use.
6579 =head2 Plugin C<tail_csv>
6581 The I<tail_csv plugin> reads files in the CSV format, e.g. the statistics file
6582 written by I<Snort>.
6587 <Metric "snort-dropped">
6592 <File "/var/log/snort/snort.stats">
6593 Instance "snort-eth0"
6595 Collect "snort-dropped"
6599 The configuration consists of one or more B<Metric> blocks that define an index
6600 into the line of the CSV file and how this value is mapped to I<collectd's>
6601 internal representation. These are followed by one or more B<Instance> blocks
6602 which configure which file to read, in which interval and which metrics to
6607 =item E<lt>B<Metric> I<Name>E<gt>
6609 The B<Metric> block configures a new metric to be extracted from the statistics
6610 file and how it is mapped on I<collectd's> data model. The string I<Name> is
6611 only used inside the B<Instance> blocks to refer to this block, so you can use
6612 one B<Metric> block for multiple CSV files.
6616 =item B<Type> I<Type>
6618 Configures which I<Type> to use when dispatching this metric. Types are defined
6619 in the L<types.db(5)> file, see the appropriate manual page for more
6620 information on specifying types. Only types with a single I<data source> are
6621 supported by the I<tail_csv plugin>. The information whether the value is an
6622 absolute value (i.e. a C<GAUGE>) or a rate (i.e. a C<DERIVE>) is taken from the
6623 I<Type's> definition.
6625 =item B<Instance> I<TypeInstance>
6627 If set, I<TypeInstance> is used to populate the type instance field of the
6628 created value lists. Otherwise, no type instance is used.
6630 =item B<ValueFrom> I<Index>
6632 Configure to read the value from the field with the zero-based index I<Index>.
6633 If the value is parsed as signed integer, unsigned integer or double depends on
6634 the B<Type> setting, see above.
6638 =item E<lt>B<File> I<Path>E<gt>
6640 Each B<File> block represents one CSV file to read. There must be at least one
6641 I<File> block but there can be multiple if you have multiple CSV files.
6645 =item B<Instance> I<PluginInstance>
6647 Sets the I<plugin instance> used when dispatching the values.
6649 =item B<Collect> I<Metric>
6651 Specifies which I<Metric> to collect. This option must be specified at least
6652 once, and you can use this option multiple times to specify more than one
6653 metric to be extracted from this statistic file.
6655 =item B<Interval> I<Seconds>
6657 Configures the interval in which to read values from this instance / file.
6658 Defaults to the plugin's default interval.
6660 =item B<TimeFrom> I<Index>
6662 Rather than using the local time when dispatching a value, read the timestamp
6663 from the field with the zero-based index I<Index>. The value is interpreted as
6664 seconds since epoch. The value is parsed as a double and may be factional.
6670 =head2 Plugin C<teamspeak2>
6672 The C<teamspeak2 plugin> connects to the query port of a teamspeak2 server and
6673 polls interesting global and virtual server data. The plugin can query only one
6674 physical server but unlimited virtual servers. You can use the following
6675 options to configure it:
6679 =item B<Host> I<hostname/ip>
6681 The hostname or ip which identifies the physical server.
6684 =item B<Port> I<port>
6686 The query port of the physical server. This needs to be a string.
6689 =item B<Server> I<port>
6691 This option has to be added once for every virtual server the plugin should
6692 query. If you want to query the virtual server on port 8767 this is what the
6693 option would look like:
6697 This option, although numeric, needs to be a string, i.E<nbsp>e. you B<must>
6698 use quotes around it! If no such statement is given only global information
6703 =head2 Plugin C<ted>
6705 The I<TED> plugin connects to a device of "The Energy Detective", a device to
6706 measure power consumption. These devices are usually connected to a serial
6707 (RS232) or USB port. The plugin opens a configured device and tries to read the
6708 current energy readings. For more information on TED, visit
6709 L<http://www.theenergydetective.com/>.
6711 Available configuration options:
6715 =item B<Device> I<Path>
6717 Path to the device on which TED is connected. collectd will need read and write
6718 permissions on that file.
6720 Default: B</dev/ttyUSB0>
6722 =item B<Retries> I<Num>
6724 Apparently reading from TED is not that reliable. You can therefore configure a
6725 number of retries here. You only configure the I<retries> here, to if you
6726 specify zero, one reading will be performed (but no retries if that fails); if
6727 you specify three, a maximum of four readings are performed. Negative values
6734 =head2 Plugin C<tcpconns>
6736 The C<tcpconns plugin> counts the number of currently established TCP
6737 connections based on the local port and/or the remote port. Since there may be
6738 a lot of connections the default if to count all connections with a local port,
6739 for which a listening socket is opened. You can use the following options to
6740 fine-tune the ports you are interested in:
6744 =item B<ListeningPorts> I<true>|I<false>
6746 If this option is set to I<true>, statistics for all local ports for which a
6747 listening socket exists are collected. The default depends on B<LocalPort> and
6748 B<RemotePort> (see below): If no port at all is specifically selected, the
6749 default is to collect listening ports. If specific ports (no matter if local or
6750 remote ports) are selected, this option defaults to I<false>, i.E<nbsp>e. only
6751 the selected ports will be collected unless this option is set to I<true>
6754 =item B<LocalPort> I<Port>
6756 Count the connections to a specific local port. This can be used to see how
6757 many connections are handled by a specific daemon, e.E<nbsp>g. the mailserver.
6758 You have to specify the port in numeric form, so for the mailserver example
6759 you'd need to set B<25>.
6761 =item B<RemotePort> I<Port>
6763 Count the connections to a specific remote port. This is useful to see how
6764 much a remote service is used. This is most useful if you want to know how many
6765 connections a local service has opened to remote services, e.E<nbsp>g. how many
6766 connections a mail server or news server has to other mail or news servers, or
6767 how many connections a web proxy holds to web servers. You have to give the
6768 port in numeric form.
6770 =item B<AllPortsSummary> I<true>|I<false>
6772 If this option is set to I<true> a summary of statistics from all connections
6773 are collectd. This option defaults to I<false>.
6777 =head2 Plugin C<thermal>
6781 =item B<ForceUseProcfs> I<true>|I<false>
6783 By default, the I<Thermal plugin> tries to read the statistics from the Linux
6784 C<sysfs> interface. If that is not available, the plugin falls back to the
6785 C<procfs> interface. By setting this option to I<true>, you can force the
6786 plugin to use the latter. This option defaults to I<false>.
6788 =item B<Device> I<Device>
6790 Selects the name of the thermal device that you want to collect or ignore,
6791 depending on the value of the B<IgnoreSelected> option. This option may be
6792 used multiple times to specify a list of devices.
6794 =item B<IgnoreSelected> I<true>|I<false>
6796 Invert the selection: If set to true, all devices B<except> the ones that
6797 match the device names specified by the B<Device> option are collected. By
6798 default only selected devices are collected if a selection is made. If no
6799 selection is configured at all, B<all> devices are selected.
6803 =head2 Plugin C<threshold>
6805 The I<Threshold plugin> checks values collected or received by I<collectd>
6806 against a configurable I<threshold> and issues I<notifications> if values are
6809 Documentation for this plugin is available in the L<collectd-threshold(5)>
6812 =head2 Plugin C<tokyotyrant>
6814 The I<TokyoTyrant plugin> connects to a TokyoTyrant server and collects a
6815 couple metrics: number of records, and database size on disk.
6819 =item B<Host> I<Hostname/IP>
6821 The hostname or ip which identifies the server.
6822 Default: B<127.0.0.1>
6824 =item B<Port> I<Service/Port>
6826 The query port of the server. This needs to be a string, even if the port is
6827 given in its numeric form.
6832 =head2 Plugin C<turbostat>
6834 The I<Turbostat plugin> reads CPU frequency and C-state residency on modern
6835 Intel processors by using the new Model Specific Registers.
6839 =item B<CoreCstates> I<Bitmask(Integer)>
6841 Bitmask of the list of core C states supported by the processor.
6842 This option should only be used if the automated detection fails.
6843 Default value extracted from the cpu model and family.
6845 Currently supported C-states (by this plugin): 3, 6, 7
6847 Example: (1<<3)+(1<<6)+(1<<7) = 392 for all states
6849 =item B<PackageCstates> I<Bitmask(Integer)>
6851 Bitmask of the list of pacages C states supported by the processor.
6852 This option should only be used if the automated detection fails.
6853 Default value extracted from the cpu model and family.
6855 Currently supported C-states (by this plugin): 2, 3, 6, 7, 8, 9, 10
6857 Example: (1<<2)+(1<<3)+(1<<6)+(1<<7) = 396 for states 2, 3, 6 and 7
6859 =item B<SystemManagementInterrupt> I<true>|I<false>
6861 Boolean enabling the collection of the I/O System-Management Interrupt
6862 counter'. This option should only be used if the automated detection
6863 fails or if you want to disable this feature.
6865 =item B<DigitalTemperatureSensor> I<true>|I<false>
6867 Boolean enabling the collection of the temperature of each core.
6868 This option should only be used if the automated detectionfails or
6869 if you want to disable this feature.
6871 =item B<DigitalTemperatureSensor> I<true>|I<false>
6873 Boolean enabling the collection of the temperature of each package.
6874 This option should only be used if the automated detectionfails or
6875 if you want to disable this feature.
6877 =item B<TCCActivationTemp> I<Temperature>
6879 Thermal Control Circuit Activation Temperature of the installed
6880 CPU. This temperature is used when collecting the temperature of
6881 cores or packages. This option should only be used if the automated
6882 detection fails. Default value extracted from B<MSR_IA32_TEMPERATURE_TARGET>
6884 =item B<RunningAveragePowerLimit> I<Bitmask(Integer)>
6886 Bitmask of the list of elements to be thermally monitored. This option
6887 should only be used if the automated detection fails or if you want to
6888 disable some collections. The different bits of this bitmask accepted
6893 =item 0 ('1'): Package
6897 =item 2 ('4'): Cores
6899 =item 3 ('8'): Embedded graphic device
6905 =head2 Plugin C<unixsock>
6909 =item B<SocketFile> I<Path>
6911 Sets the socket-file which is to be created.
6913 =item B<SocketGroup> I<Group>
6915 If running as root change the group of the UNIX-socket after it has been
6916 created. Defaults to B<collectd>.
6918 =item B<SocketPerms> I<Permissions>
6920 Change the file permissions of the UNIX-socket after it has been created. The
6921 permissions must be given as a numeric, octal value as you would pass to
6922 L<chmod(1)>. Defaults to B<0770>.
6924 =item B<DeleteSocket> B<false>|B<true>
6926 If set to B<true>, delete the socket file before calling L<bind(2)>, if a file
6927 with the given name already exists. If I<collectd> crashes a socket file may be
6928 left over, preventing the daemon from opening a new socket when restarted.
6929 Since this is potentially dangerous, this defaults to B<false>.
6933 =head2 Plugin C<uuid>
6935 This plugin, if loaded, causes the Hostname to be taken from the machine's
6936 UUID. The UUID is a universally unique designation for the machine, usually
6937 taken from the machine's BIOS. This is most useful if the machine is running in
6938 a virtual environment such as Xen, in which case the UUID is preserved across
6939 shutdowns and migration.
6941 The following methods are used to find the machine's UUID, in order:
6947 Check I</etc/uuid> (or I<UUIDFile>).
6951 Check for UUID from HAL (L<http://www.freedesktop.org/wiki/Software/hal>) if
6956 Check for UUID from C<dmidecode> / SMBIOS.
6960 Check for UUID from Xen hypervisor.
6964 If no UUID can be found then the hostname is not modified.
6968 =item B<UUIDFile> I<Path>
6970 Take the UUID from the given file (default I</etc/uuid>).
6974 =head2 Plugin C<varnish>
6976 The I<varnish plugin> collects information about Varnish, an HTTP accelerator.
6977 It collects a subset of the values displayed by L<varnishstat(1)>, and
6978 organizes them in categories which can be enabled or disabled. Currently only
6979 metrics shown in L<varnishstat(1)>'s I<MAIN> section are collected. The exact
6980 meaning of each metric can be found in L<varnish-counters(7)>.
6985 <Instance "example">
6989 CollectConnections true
6990 CollectDirectorDNS false
6994 CollectObjects false
6996 CollectSession false
7006 CollectWorkers false
7010 The configuration consists of one or more E<lt>B<Instance>E<nbsp>I<Name>E<gt>
7011 blocks. I<Name> is the parameter passed to "varnishd -n". If left empty, it
7012 will collectd statistics from the default "varnishd" instance (this should work
7013 fine in most cases).
7015 Inside each E<lt>B<Instance>E<gt> blocks, the following options are recognized:
7019 =item B<CollectBackend> B<true>|B<false>
7021 Back-end connection statistics, such as successful, reused,
7022 and closed connections. True by default.
7024 =item B<CollectBan> B<true>|B<false>
7026 Statistics about ban operations, such as number of bans added, retired, and
7027 number of objects tested against ban operations. Only available with Varnish
7028 3.x and above. False by default.
7030 =item B<CollectCache> B<true>|B<false>
7032 Cache hits and misses. True by default.
7034 =item B<CollectConnections> B<true>|B<false>
7036 Number of client connections received, accepted and dropped. True by default.
7038 =item B<CollectDirectorDNS> B<true>|B<false>
7040 DNS director lookup cache statistics. Only available with Varnish 3.x. False by
7043 =item B<CollectESI> B<true>|B<false>
7045 Edge Side Includes (ESI) parse statistics. False by default.
7047 =item B<CollectFetch> B<true>|B<false>
7049 Statistics about fetches (HTTP requests sent to the backend). False by default.
7051 =item B<CollectHCB> B<true>|B<false>
7053 Inserts and look-ups in the crit bit tree based hash. Look-ups are
7054 divided into locked and unlocked look-ups. False by default.
7056 =item B<CollectObjects> B<true>|B<false>
7058 Statistics on cached objects: number of objects expired, nuked (prematurely
7059 expired), saved, moved, etc. False by default.
7061 =item B<CollectPurge> B<true>|B<false>
7063 Statistics about purge operations, such as number of purges added, retired, and
7064 number of objects tested against purge operations. Only available with Varnish
7065 2.x. False by default.
7067 =item B<CollectSession> B<true>|B<false>
7069 Client session statistics. Number of past and current sessions, session herd and
7070 linger counters, etc. False by default. Note that if using Varnish 4.x, some
7071 metrics found in the Connections and Threads sections with previous versions of
7072 Varnish have been moved here.
7074 =item B<CollectSHM> B<true>|B<false>
7076 Statistics about the shared memory log, a memory region to store
7077 log messages which is flushed to disk when full. True by default.
7079 =item B<CollectSMA> B<true>|B<false>
7081 malloc or umem (umem_alloc(3MALLOC) based) storage statistics. The umem storage
7082 component is Solaris specific. Only available with Varnish 2.x. False by
7085 =item B<CollectSMS> B<true>|B<false>
7087 synth (synthetic content) storage statistics. This storage
7088 component is used internally only. False by default.
7090 =item B<CollectSM> B<true>|B<false>
7092 file (memory mapped file) storage statistics. Only available with Varnish 2.x.
7095 =item B<CollectStruct> B<true>|B<false>
7097 Current varnish internal state statistics. Number of current sessions, objects
7098 in cache store, open connections to backends (with Varnish 2.x), etc. False by
7101 =item B<CollectTotals> B<true>|B<false>
7103 Collects overview counters, such as the number of sessions created,
7104 the number of requests and bytes transferred. False by default.
7106 =item B<CollectUptime> B<true>|B<false>
7108 Varnish uptime. Only available with Varnish 3.x and above. False by default.
7110 =item B<CollectVCL> B<true>|B<false>
7112 Number of total (available + discarded) VCL (config files). False by default.
7114 =item B<CollectVSM> B<true>|B<false>
7116 Collect statistics about Varnish's shared memory usage (used by the logging and
7117 statistics subsystems). Only available with Varnish 4.x. False by default.
7119 =item B<CollectWorkers> B<true>|B<false>
7121 Collect statistics about worker threads. False by default.
7125 =head2 Plugin C<virt>
7127 This plugin allows CPU, disk and network load to be collected for virtualized
7128 guests on the machine. This means that these metrics can be collected for guest
7129 systems without installing any software on them - I<collectd> only runs on the
7130 host system. The statistics are collected through libvirt
7131 (L<http://libvirt.org/>).
7133 Only I<Connection> is required.
7137 =item B<Connection> I<uri>
7139 Connect to the hypervisor given by I<uri>. For example if using Xen use:
7141 Connection "xen:///"
7143 Details which URIs allowed are given at L<http://libvirt.org/uri.html>.
7145 =item B<RefreshInterval> I<seconds>
7147 Refresh the list of domains and devices every I<seconds>. The default is 60
7148 seconds. Setting this to be the same or smaller than the I<Interval> will cause
7149 the list of domains and devices to be refreshed on every iteration.
7151 Refreshing the devices in particular is quite a costly operation, so if your
7152 virtualization setup is static you might consider increasing this. If this
7153 option is set to 0, refreshing is disabled completely.
7155 =item B<Domain> I<name>
7157 =item B<BlockDevice> I<name:dev>
7159 =item B<InterfaceDevice> I<name:dev>
7161 =item B<IgnoreSelected> B<true>|B<false>
7163 Select which domains and devices are collected.
7165 If I<IgnoreSelected> is not given or B<false> then only the listed domains and
7166 disk/network devices are collected.
7168 If I<IgnoreSelected> is B<true> then the test is reversed and the listed
7169 domains and disk/network devices are ignored, while the rest are collected.
7171 The domain name and device names may use a regular expression, if the name is
7172 surrounded by I</.../> and collectd was compiled with support for regexps.
7174 The default is to collect statistics for all domains and all their devices.
7178 BlockDevice "/:hdb/"
7179 IgnoreSelected "true"
7181 Ignore all I<hdb> devices on any domain, but other block devices (eg. I<hda>)
7184 =item B<HostnameFormat> B<name|uuid|hostname|...>
7186 When the virt plugin logs data, it sets the hostname of the collected data
7187 according to this setting. The default is to use the guest name as provided by
7188 the hypervisor, which is equal to setting B<name>.
7190 B<uuid> means use the guest's UUID. This is useful if you want to track the
7191 same guest across migrations.
7193 B<hostname> means to use the global B<Hostname> setting, which is probably not
7194 useful on its own because all guests will appear to have the same name.
7196 You can also specify combinations of these fields. For example B<name uuid>
7197 means to concatenate the guest name and UUID (with a literal colon character
7198 between, thus I<"foo:1234-1234-1234-1234">).
7200 At the moment of writing (collectd-5.5), hostname string is limited to 62
7201 characters. In case when combination of fields exceeds 62 characters,
7202 hostname will be truncated without a warning.
7204 =item B<InterfaceFormat> B<name>|B<address>
7206 When the virt plugin logs interface data, it sets the name of the collected
7207 data according to this setting. The default is to use the path as provided by
7208 the hypervisor (the "dev" property of the target node), which is equal to
7211 B<address> means use the interface's mac address. This is useful since the
7212 interface path might change between reboots of a guest or across migrations.
7214 =item B<PluginInstanceFormat> B<name|uuid|none>
7216 When the virt plugin logs data, it sets the plugin_instance of the collected
7217 data according to this setting. The default is to not set the plugin_instance.
7219 B<name> means use the guest's name as provided by the hypervisor.
7220 B<uuid> means use the guest's UUID.
7222 You can also specify combinations of the B<name> and B<uuid> fields.
7223 For example B<name uuid> means to concatenate the guest name and UUID
7224 (with a literal colon character between, thus I<"foo:1234-1234-1234-1234">).
7228 =head2 Plugin C<vmem>
7230 The C<vmem> plugin collects information about the usage of virtual memory.
7231 Since the statistics provided by the Linux kernel are very detailed, they are
7232 collected very detailed. However, to get all the details, you have to switch
7233 them on manually. Most people just want an overview over, such as the number of
7234 pages read from swap space.
7238 =item B<Verbose> B<true>|B<false>
7240 Enables verbose collection of information. This will start collecting page
7241 "actions", e.E<nbsp>g. page allocations, (de)activations, steals and so on.
7242 Part of these statistics are collected on a "per zone" basis.
7246 =head2 Plugin C<vserver>
7248 This plugin doesn't have any options. B<VServer> support is only available for
7249 Linux. It cannot yet be found in a vanilla kernel, though. To make use of this
7250 plugin you need a kernel that has B<VServer> support built in, i.E<nbsp>e. you
7251 need to apply the patches and compile your own kernel, which will then provide
7252 the F</proc/virtual> filesystem that is required by this plugin.
7254 The B<VServer> homepage can be found at L<http://linux-vserver.org/>.
7256 B<Note>: The traffic collected by this plugin accounts for the amount of
7257 traffic passing a socket which might be a lot less than the actual on-wire
7258 traffic (e.E<nbsp>g. due to headers and retransmission). If you want to
7259 collect on-wire traffic you could, for example, use the logging facilities of
7260 iptables to feed data for the guest IPs into the iptables plugin.
7262 =head2 Plugin C<write_graphite>
7264 The C<write_graphite> plugin writes data to I<Graphite>, an open-source metrics
7265 storage and graphing project. The plugin connects to I<Carbon>, the data layer
7266 of I<Graphite>, via I<TCP> or I<UDP> and sends data via the "line based"
7267 protocol (per default using portE<nbsp>2003). The data will be sent in blocks
7268 of at most 1428 bytes to minimize the number of network packets.
7272 <Plugin write_graphite>
7282 The configuration consists of one or more E<lt>B<Node>E<nbsp>I<Name>E<gt>
7283 blocks. Inside the B<Node> blocks, the following options are recognized:
7287 =item B<Host> I<Address>
7289 Hostname or address to connect to. Defaults to C<localhost>.
7291 =item B<Port> I<Service>
7293 Service name or port number to connect to. Defaults to C<2003>.
7295 =item B<Protocol> I<String>
7297 Protocol to use when connecting to I<Graphite>. Defaults to C<tcp>.
7299 =item B<LogSendErrors> B<false>|B<true>
7301 If set to B<true> (the default), logs errors when sending data to I<Graphite>.
7302 If set to B<false>, it will not log the errors. This is especially useful when
7303 using Protocol UDP since many times we want to use the "fire-and-forget"
7304 approach and logging errors fills syslog with unneeded messages.
7306 =item B<Prefix> I<String>
7308 When set, I<String> is added in front of the host name. Dots and whitespace are
7309 I<not> escaped in this string (see B<EscapeCharacter> below).
7311 =item B<Postfix> I<String>
7313 When set, I<String> is appended to the host name. Dots and whitespace are
7314 I<not> escaped in this string (see B<EscapeCharacter> below).
7316 =item B<EscapeCharacter> I<Char>
7318 I<Carbon> uses the dot (C<.>) as escape character and doesn't allow whitespace
7319 in the identifier. The B<EscapeCharacter> option determines which character
7320 dots, whitespace and control characters are replaced with. Defaults to
7323 =item B<StoreRates> B<false>|B<true>
7325 If set to B<true> (the default), convert counter values to rates. If set to
7326 B<false> counter values are stored as is, i.E<nbsp>e. as an increasing integer
7329 =item B<SeparateInstances> B<false>|B<true>
7331 If set to B<true>, the plugin instance and type instance will be in their own
7332 path component, for example C<host.cpu.0.cpu.idle>. If set to B<false> (the
7333 default), the plugin and plugin instance (and likewise the type and type
7334 instance) are put into one component, for example C<host.cpu-0.cpu-idle>.
7336 =item B<AlwaysAppendDS> B<false>|B<true>
7338 If set to B<true>, append the name of the I<Data Source> (DS) to the "metric"
7339 identifier. If set to B<false> (the default), this is only done when there is
7344 =head2 Plugin C<write_tsdb>
7346 The C<write_tsdb> plugin writes data to I<OpenTSDB>, a scalable open-source
7347 time series database. The plugin connects to a I<TSD>, a masterless, no shared
7348 state daemon that ingests metrics and stores them in HBase. The plugin uses
7349 I<TCP> over the "line based" protocol with a default port 4242. The data will
7350 be sent in blocks of at most 1428 bytes to minimize the number of network
7357 Host "tsd-1.my.domain"
7359 HostTags "status=production"
7363 The configuration consists of one or more E<lt>B<Node>E<nbsp>I<Name>E<gt>
7364 blocks. Inside the B<Node> blocks, the following options are recognized:
7368 =item B<Host> I<Address>
7370 Hostname or address to connect to. Defaults to C<localhost>.
7372 =item B<Port> I<Service>
7374 Service name or port number to connect to. Defaults to C<4242>.
7377 =item B<HostTags> I<String>
7379 When set, I<HostTags> is added to the end of the metric. It is intended to be
7380 used for name=value pairs that the TSD will tag the metric with. Dots and
7381 whitespace are I<not> escaped in this string.
7383 =item B<StoreRates> B<false>|B<true>
7385 If set to B<true>, convert counter values to rates. If set to B<false>
7386 (the default) counter values are stored as is, as an increasing
7389 =item B<AlwaysAppendDS> B<false>|B<true>
7391 If set the B<true>, append the name of the I<Data Source> (DS) to the "metric"
7392 identifier. If set to B<false> (the default), this is only done when there is
7397 =head2 Plugin C<write_mongodb>
7399 The I<write_mongodb plugin> will send values to I<MongoDB>, a schema-less
7404 <Plugin "write_mongodb">
7413 The plugin can send values to multiple instances of I<MongoDB> by specifying
7414 one B<Node> block for each instance. Within the B<Node> blocks, the following
7415 options are available:
7419 =item B<Host> I<Address>
7421 Hostname or address to connect to. Defaults to C<localhost>.
7423 =item B<Port> I<Service>
7425 Service name or port number to connect to. Defaults to C<27017>.
7427 =item B<Timeout> I<Milliseconds>
7429 Set the timeout for each operation on I<MongoDB> to I<Timeout> milliseconds.
7430 Setting this option to zero means no timeout, which is the default.
7432 =item B<StoreRates> B<false>|B<true>
7434 If set to B<true> (the default), convert counter values to rates. If set to
7435 B<false> counter values are stored as is, i.e. as an increasing integer
7438 =item B<Database> I<Database>
7440 =item B<User> I<User>
7442 =item B<Password> I<Password>
7444 Sets the information used when authenticating to a I<MongoDB> database. The
7445 fields are optional (in which case no authentication is attempted), but if you
7446 want to use authentication all three fields must be set.
7450 =head2 Plugin C<write_http>
7452 This output plugin submits values to an HTTP server using POST requests and
7453 encoding metrics with JSON or using the C<PUTVAL> command described in
7454 L<collectd-unixsock(5)>.
7458 <Plugin "write_http">
7460 URL "http://example.com/post-collectd"
7467 The plugin can send values to multiple HTTP servers by specifying one
7468 E<lt>B<Node>E<nbsp>I<Name>E<gt> block for each server. Within each B<Node>
7469 block, the following options are available:
7475 URL to which the values are submitted to. Mandatory.
7477 =item B<User> I<Username>
7479 Optional user name needed for authentication.
7481 =item B<Password> I<Password>
7483 Optional password needed for authentication.
7485 =item B<VerifyPeer> B<true>|B<false>
7487 Enable or disable peer SSL certificate verification. See
7488 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
7490 =item B<VerifyHost> B<true|false>
7492 Enable or disable peer host name verification. If enabled, the plugin checks if
7493 the C<Common Name> or a C<Subject Alternate Name> field of the SSL certificate
7494 matches the host name provided by the B<URL> option. If this identity check
7495 fails, the connection is aborted. Obviously, only works when connecting to a
7496 SSL enabled server. Enabled by default.
7498 =item B<CACert> I<File>
7500 File that holds one or more SSL certificates. If you want to use HTTPS you will
7501 possibly need this option. What CA certificates come bundled with C<libcurl>
7502 and are checked by default depends on the distribution you use.
7504 =item B<CAPath> I<Directory>
7506 Directory holding one or more CA certificate files. You can use this if for
7507 some reason all the needed CA certificates aren't in the same file and can't be
7508 pointed to using the B<CACert> option. Requires C<libcurl> to be built against
7511 =item B<ClientKey> I<File>
7513 File that holds the private key in PEM format to be used for certificate-based
7516 =item B<ClientCert> I<File>
7518 File that holds the SSL certificate to be used for certificate-based
7521 =item B<ClientKeyPass> I<Password>
7523 Password required to load the private key in B<ClientKey>.
7525 =item B<SSLVersion> B<SSLv2>|B<SSLv3>|B<TLSv1>|B<TLSv1_0>|B<TLSv1_1>|B<TLSv1_2>
7527 Define which SSL protocol version must be used. By default C<libcurl> will
7528 attempt to figure out the remote SSL protocol version. See
7529 L<curl_easy_setopt(3)> for more details.
7531 =item B<Format> B<Command>|B<JSON>
7533 Format of the output to generate. If set to B<Command>, will create output that
7534 is understood by the I<Exec> and I<UnixSock> plugins. When set to B<JSON>, will
7535 create output in the I<JavaScript Object Notation> (JSON).
7537 Defaults to B<Command>.
7539 =item B<StoreRates> B<true|false>
7541 If set to B<true>, convert counter values to rates. If set to B<false> (the
7542 default) counter values are stored as is, i.e. as an increasing integer number.
7544 =item B<BufferSize> I<Bytes>
7546 Sets the send buffer size to I<Bytes>. By increasing this buffer, less HTTP
7547 requests will be generated, but more metrics will be batched / metrics are
7548 cached for longer before being sent, introducing additional delay until they
7549 are available on the server side. I<Bytes> must be at least 1024 and cannot
7550 exceed the size of an C<int>, i.e. 2E<nbsp>GByte.
7551 Defaults to C<4096>.
7553 =item B<LowSpeedLimit> I<Bytes per Second>
7555 Sets the minimal transfer rate in I<Bytes per Second> below which the
7556 connection with the HTTP server will be considered too slow and aborted. All
7557 the data submitted over this connection will probably be lost. Defaults to 0,
7558 which means no minimum transfer rate is enforced.
7560 =item B<Timeout> I<Timeout>
7562 Sets the maximum time in milliseconds given for HTTP POST operations to
7563 complete. When this limit is reached, the POST operation will be aborted, and
7564 all the data in the current send buffer will probably be lost. Defaults to 0,
7565 which means the connection never times out.
7567 =item B<LogHttpError> B<false>|B<true>
7569 Enables printing of HTTP error code to log. Turned off by default.
7571 The C<write_http> plugin regularly submits the collected values to the HTTP
7572 server. How frequently this happens depends on how much data you are collecting
7573 and the size of B<BufferSize>. The optimal value to set B<Timeout> to is
7574 slightly below this interval, which you can estimate by monitoring the network
7575 traffic between collectd and the HTTP server.
7579 =head2 Plugin C<write_kafka>
7581 The I<write_kafka plugin> will send values to a I<Kafka> topic, a distributed
7585 <Plugin "write_kafka">
7586 Property "metadata.broker.list" "broker1:9092,broker2:9092"
7592 The following options are understood by the I<write_kafka plugin>:
7596 =item E<lt>B<Topic> I<Name>E<gt>
7598 The plugin's configuration consists of one or more B<Topic> blocks. Each block
7599 is given a unique I<Name> and specifies one kafka producer.
7600 Inside the B<Topic> block, the following per-topic options are
7605 =item B<Property> I<String> I<String>
7607 Configure the named property for the current topic. Properties are
7608 forwarded to the kafka producer library B<librdkafka>.
7610 =item B<Key> I<String>
7612 Use the specified string as a partioning key for the topic. Kafka breaks
7613 topic into partitions and guarantees that for a given topology, the same
7614 consumer will be used for a specific key. The special (case insensitive)
7615 string B<Random> can be used to specify that an arbitrary partition should
7618 =item B<Format> B<Command>|B<JSON>|B<Graphite>
7620 Selects the format in which messages are sent to the broker. If set to
7621 B<Command> (the default), values are sent as C<PUTVAL> commands which are
7622 identical to the syntax used by the I<Exec> and I<UnixSock plugins>.
7624 If set to B<JSON>, the values are encoded in the I<JavaScript Object Notation>,
7625 an easy and straight forward exchange format.
7627 If set to B<Graphite>, values are encoded in the I<Graphite> format, which is
7628 C<E<lt>metricE<gt> E<lt>valueE<gt> E<lt>timestampE<gt>\n>.
7630 =item B<StoreRates> B<true>|B<false>
7632 Determines whether or not C<COUNTER>, C<DERIVE> and C<ABSOLUTE> data sources
7633 are converted to a I<rate> (i.e. a C<GAUGE> value). If set to B<false> (the
7634 default), no conversion is performed. Otherwise the conversion is performed
7635 using the internal value cache.
7637 Please note that currently this option is only used if the B<Format> option has
7638 been set to B<JSON>.
7640 =item B<GraphitePrefix> (B<Format>=I<Graphite> only)
7642 A prefix can be added in the metric name when outputting in the I<Graphite>
7643 format. It's added before the I<Host> name.
7645 C<E<lt>prefixE<gt>E<lt>hostE<gt>E<lt>postfixE<gt>E<lt>pluginE<gt>E<lt>typeE<gt>E<lt>nameE<gt>>
7647 =item B<GraphitePostfix> (B<Format>=I<Graphite> only)
7649 A postfix can be added in the metric name when outputting in the I<Graphite>
7650 format. It's added after the I<Host> name.
7652 C<E<lt>prefixE<gt>E<lt>hostE<gt>E<lt>postfixE<gt>E<lt>pluginE<gt>E<lt>typeE<gt>E<lt>nameE<gt>>
7654 =item B<GraphiteEscapeChar> (B<Format>=I<Graphite> only)
7656 Specify a character to replace dots (.) in the host part of the metric name.
7657 In I<Graphite> metric name, dots are used as separators between different
7658 metric parts (host, plugin, type).
7659 Default is C<_> (I<Underscore>).
7661 =item B<GraphiteSeparateInstances> B<false>|B<true>
7663 If set to B<true>, the plugin instance and type instance will be in their own
7664 path component, for example C<host.cpu.0.cpu.idle>. If set to B<false> (the
7665 default), the plugin and plugin instance (and likewise the type and type
7666 instance) are put into one component, for example C<host.cpu-0.cpu-idle>.
7668 =item B<StoreRates> B<true>|B<false>
7670 If set to B<true> (the default), convert counter values to rates. If set to
7671 B<false> counter values are stored as is, i.e. as an increasing integer number.
7673 This will be reflected in the C<ds_type> tag: If B<StoreRates> is enabled,
7674 converted values will have "rate" appended to the data source type, e.g.
7675 C<ds_type:derive:rate>.
7679 =item B<Property> I<String> I<String>
7681 Configure the kafka producer through properties, you almost always will
7682 want to set B<metadata.broker.list> to your Kafka broker list.
7686 =head2 Plugin C<write_redis>
7688 The I<write_redis plugin> submits values to I<Redis>, a data structure server.
7692 <Plugin "write_redis">
7704 Values are submitted to I<Sorted Sets>, using the metric name as the key, and
7705 the timestamp as the score. Retrieving a date range can then be done using the
7706 C<ZRANGEBYSCORE> I<Redis> command. Additionally, all the identifiers of these
7707 I<Sorted Sets> are kept in a I<Set> called C<collectd/values> (or
7708 C<${prefix}/values> if the B<Prefix> option was specified) and can be retrieved
7709 using the C<SMEMBERS> I<Redis> command. You can specify the database to use
7710 with the B<Database> parameter (default is C<0>). See
7711 L<http://redis.io/commands#sorted_set> and L<http://redis.io/commands#set> for
7714 The information shown in the synopsis above is the I<default configuration>
7715 which is used by the plugin if no configuration is present.
7717 The plugin can send values to multiple instances of I<Redis> by specifying
7718 one B<Node> block for each instance. Within the B<Node> blocks, the following
7719 options are available:
7723 =item B<Node> I<Nodename>
7725 The B<Node> block identifies a new I<Redis> node, that is a new I<Redis>
7726 instance running on a specified host and port. The node name is a
7727 canonical identifier which is used as I<plugin instance>. It is limited to
7728 51E<nbsp>characters in length.
7730 =item B<Host> I<Hostname>
7732 The B<Host> option is the hostname or IP-address where the I<Redis> instance is
7735 =item B<Port> I<Port>
7737 The B<Port> option is the TCP port on which the Redis instance accepts
7738 connections. Either a service name of a port number may be given. Please note
7739 that numerical port numbers must be given as a string, too.
7741 =item B<Timeout> I<Milliseconds>
7743 The B<Timeout> option sets the socket connection timeout, in milliseconds.
7745 =item B<Prefix> I<Prefix>
7747 Prefix used when constructing the name of the I<Sorted Sets> and the I<Set>
7748 containing all metrics. Defaults to C<collectd/>, so metrics will have names
7749 like C<collectd/cpu-0/cpu-user>. When setting this to something different, it
7750 is recommended but not required to include a trailing slash in I<Prefix>.
7752 =item B<Database> I<Index>
7754 This index selects the redis database to use for writing operations. Defaults
7757 =item B<MaxSetSize> I<Items>
7759 The B<MaxSetSize> option limits the number of items that the I<Sorted Sets> can
7760 hold. Negative values for I<Items> sets no limit, which is the default behavior.
7762 =item B<StoreRates> B<true>|B<false>
7764 If set to B<true> (the default), convert counter values to rates. If set to
7765 B<false> counter values are stored as is, i.e. as an increasing integer number.
7769 =head2 Plugin C<write_riemann>
7771 The I<write_riemann plugin> will send values to I<Riemann>, a powerful stream
7772 aggregation and monitoring system. The plugin sends I<Protobuf> encoded data to
7773 I<Riemann> using UDP packets.
7777 <Plugin "write_riemann">
7783 AlwaysAppendDS false
7787 Attribute "foo" "bar"
7790 The following options are understood by the I<write_riemann plugin>:
7794 =item E<lt>B<Node> I<Name>E<gt>
7796 The plugin's configuration consists of one or more B<Node> blocks. Each block
7797 is given a unique I<Name> and specifies one connection to an instance of
7798 I<Riemann>. Indise the B<Node> block, the following per-connection options are
7803 =item B<Host> I<Address>
7805 Hostname or address to connect to. Defaults to C<localhost>.
7807 =item B<Port> I<Service>
7809 Service name or port number to connect to. Defaults to C<5555>.
7811 =item B<Protocol> B<UDP>|B<TCP>
7813 Specify the protocol to use when communicating with I<Riemann>. Defaults to
7816 =item B<Batch> B<true>|B<false>
7818 If set to B<true> and B<Protocol> is set to B<TCP>,
7819 events will be batched in memory and flushed at
7820 regular intervals or when B<BatchMaxSize> is exceeded.
7822 Notifications are not batched and sent as soon as possible.
7824 When enabled, it can occur that events get processed by the Riemann server
7825 close to or after their expiration time. Tune the B<TTLFactor> and
7826 B<BatchMaxSize> settings according to the amount of values collected, if this
7831 =item B<BatchMaxSize> I<size>
7833 Maximum payload size for a riemann packet. Defaults to 8192
7835 =item B<StoreRates> B<true>|B<false>
7837 If set to B<true> (the default), convert counter values to rates. If set to
7838 B<false> counter values are stored as is, i.e. as an increasing integer number.
7840 This will be reflected in the C<ds_type> tag: If B<StoreRates> is enabled,
7841 converted values will have "rate" appended to the data source type, e.g.
7842 C<ds_type:derive:rate>.
7844 =item B<AlwaysAppendDS> B<false>|B<true>
7846 If set to B<true>, append the name of the I<Data Source> (DS) to the
7847 "service", i.e. the field that, together with the "host" field, uniquely
7848 identifies a metric in I<Riemann>. If set to B<false> (the default), this is
7849 only done when there is more than one DS.
7851 =item B<TTLFactor> I<Factor>
7853 I<Riemann> events have a I<Time to Live> (TTL) which specifies how long each
7854 event is considered active. I<collectd> populates this field based on the
7855 metrics interval setting. This setting controls the factor with which the
7856 interval is multiplied to set the TTL. The default value is B<2.0>. Unless you
7857 know exactly what you're doing, you should only increase this setting from its
7860 =item B<Notifications> B<false>|B<true>
7862 If set to B<true>, create riemann events for notifications. This is B<true>
7863 by default. When processing thresholds from write_riemann, it might prove
7864 useful to avoid getting notification events.
7866 =item B<CheckThresholds> B<false>|B<true>
7868 If set to B<true>, attach state to events based on thresholds defined
7869 in the B<Threshold> plugin. Defaults to B<false>.
7871 =item B<EventServicePrefix> I<String>
7873 Add the given string as a prefix to the event service name.
7874 If B<EventServicePrefix> not set or set to an empty string (""),
7875 no prefix will be used.
7879 =item B<Tag> I<String>
7881 Add the given string as an additional tag to the metric being sent to
7884 =item B<Attribute> I<String> I<String>
7886 Consider the two given strings to be the key and value of an additional
7887 attribute for each metric being sent out to I<Riemann>.
7891 =head2 Plugin C<write_sensu>
7893 The I<write_sensu plugin> will send values to I<Sensu>, a powerful stream
7894 aggregation and monitoring system. The plugin sends I<JSON> encoded data to
7895 a local I<Sensu> client using a TCP socket.
7897 At the moment, the I<write_sensu plugin> does not send over a collectd_host
7898 parameter so it is not possible to use one collectd instance as a gateway for
7899 others. Each collectd host must pair with one I<Sensu> client.
7903 <Plugin "write_sensu">
7908 AlwaysAppendDS false
7909 MetricHandler "influx"
7910 MetricHandler "default"
7911 NotificationHandler "flapjack"
7912 NotificationHandler "howling_monkey"
7916 Attribute "foo" "bar"
7919 The following options are understood by the I<write_sensu plugin>:
7923 =item E<lt>B<Node> I<Name>E<gt>
7925 The plugin's configuration consists of one or more B<Node> blocks. Each block
7926 is given a unique I<Name> and specifies one connection to an instance of
7927 I<Sensu>. Inside the B<Node> block, the following per-connection options are
7932 =item B<Host> I<Address>
7934 Hostname or address to connect to. Defaults to C<localhost>.
7936 =item B<Port> I<Service>
7938 Service name or port number to connect to. Defaults to C<3030>.
7940 =item B<StoreRates> B<true>|B<false>
7942 If set to B<true> (the default), convert counter values to rates. If set to
7943 B<false> counter values are stored as is, i.e. as an increasing integer number.
7945 This will be reflected in the C<collectd_data_source_type> tag: If
7946 B<StoreRates> is enabled, converted values will have "rate" appended to the
7947 data source type, e.g. C<collectd_data_source_type:derive:rate>.
7949 =item B<AlwaysAppendDS> B<false>|B<true>
7951 If set the B<true>, append the name of the I<Data Source> (DS) to the
7952 "service", i.e. the field that, together with the "host" field, uniquely
7953 identifies a metric in I<Sensu>. If set to B<false> (the default), this is
7954 only done when there is more than one DS.
7956 =item B<Notifications> B<false>|B<true>
7958 If set to B<true>, create I<Sensu> events for notifications. This is B<false>
7959 by default. At least one of B<Notifications> or B<Metrics> should be enabled.
7961 =item B<Metrics> B<false>|B<true>
7963 If set to B<true>, create I<Sensu> events for metrics. This is B<false>
7964 by default. At least one of B<Notifications> or B<Metrics> should be enabled.
7967 =item B<Separator> I<String>
7969 Sets the separator for I<Sensu> metrics name or checks. Defaults to "/".
7971 =item B<MetricHandler> I<String>
7973 Add a handler that will be set when metrics are sent to I<Sensu>. You can add
7974 several of them, one per line. Defaults to no handler.
7976 =item B<NotificationHandler> I<String>
7978 Add a handler that will be set when notifications are sent to I<Sensu>. You can
7979 add several of them, one per line. Defaults to no handler.
7981 =item B<EventServicePrefix> I<String>
7983 Add the given string as a prefix to the event service name.
7984 If B<EventServicePrefix> not set or set to an empty string (""),
7985 no prefix will be used.
7989 =item B<Tag> I<String>
7991 Add the given string as an additional tag to the metric being sent to
7994 =item B<Attribute> I<String> I<String>
7996 Consider the two given strings to be the key and value of an additional
7997 attribute for each metric being sent out to I<Sensu>.
8001 =head2 Plugin C<zookeeper>
8003 The I<zookeeper plugin> will collect statistics from a I<Zookeeper> server
8004 using the mntr command. It requires Zookeeper 3.4.0+ and access to the
8009 <Plugin "zookeeper">
8016 =item B<Host> I<Address>
8018 Hostname or address to connect to. Defaults to C<localhost>.
8020 =item B<Port> I<Service>
8022 Service name or port number to connect to. Defaults to C<2181>.
8026 =head1 THRESHOLD CONFIGURATION
8028 Starting with version C<4.3.0> collectd has support for B<monitoring>. By that
8029 we mean that the values are not only stored or sent somewhere, but that they
8030 are judged and, if a problem is recognized, acted upon. The only action
8031 collectd takes itself is to generate and dispatch a "notification". Plugins can
8032 register to receive notifications and perform appropriate further actions.
8034 Since systems and what you expect them to do differ a lot, you can configure
8035 B<thresholds> for your values freely. This gives you a lot of flexibility but
8036 also a lot of responsibility.
8038 Every time a value is out of range a notification is dispatched. This means
8039 that the idle percentage of your CPU needs to be less then the configured
8040 threshold only once for a notification to be generated. There's no such thing
8041 as a moving average or similar - at least not now.
8043 Also, all values that match a threshold are considered to be relevant or
8044 "interesting". As a consequence collectd will issue a notification if they are
8045 not received for B<Timeout> iterations. The B<Timeout> configuration option is
8046 explained in section L<"GLOBAL OPTIONS">. If, for example, B<Timeout> is set to
8047 "2" (the default) and some hosts sends it's CPU statistics to the server every
8048 60 seconds, a notification will be dispatched after about 120 seconds. It may
8049 take a little longer because the timeout is checked only once each B<Interval>
8052 When a value comes within range again or is received after it was missing, an
8053 "OKAY-notification" is dispatched.
8055 Here is a configuration example to get you started. Read below for more
8068 <Plugin "interface">
8085 WarningMin 100000000
8091 There are basically two types of configuration statements: The C<Host>,
8092 C<Plugin>, and C<Type> blocks select the value for which a threshold should be
8093 configured. The C<Plugin> and C<Type> blocks may be specified further using the
8094 C<Instance> option. You can combine the block by nesting the blocks, though
8095 they must be nested in the above order, i.E<nbsp>e. C<Host> may contain either
8096 C<Plugin> and C<Type> blocks, C<Plugin> may only contain C<Type> blocks and
8097 C<Type> may not contain other blocks. If multiple blocks apply to the same
8098 value the most specific block is used.
8100 The other statements specify the threshold to configure. They B<must> be
8101 included in a C<Type> block. Currently the following statements are recognized:
8105 =item B<FailureMax> I<Value>
8107 =item B<WarningMax> I<Value>
8109 Sets the upper bound of acceptable values. If unset defaults to positive
8110 infinity. If a value is greater than B<FailureMax> a B<FAILURE> notification
8111 will be created. If the value is greater than B<WarningMax> but less than (or
8112 equal to) B<FailureMax> a B<WARNING> notification will be created.
8114 =item B<FailureMin> I<Value>
8116 =item B<WarningMin> I<Value>
8118 Sets the lower bound of acceptable values. If unset defaults to negative
8119 infinity. If a value is less than B<FailureMin> a B<FAILURE> notification will
8120 be created. If the value is less than B<WarningMin> but greater than (or equal
8121 to) B<FailureMin> a B<WARNING> notification will be created.
8123 =item B<DataSource> I<DSName>
8125 Some data sets have more than one "data source". Interesting examples are the
8126 C<if_octets> data set, which has received (C<rx>) and sent (C<tx>) bytes and
8127 the C<disk_ops> data set, which holds C<read> and C<write> operations. The
8128 system load data set, C<load>, even has three data sources: C<shortterm>,
8129 C<midterm>, and C<longterm>.
8131 Normally, all data sources are checked against a configured threshold. If this
8132 is undesirable, or if you want to specify different limits for each data
8133 source, you can use the B<DataSource> option to have a threshold apply only to
8136 =item B<Invert> B<true>|B<false>
8138 If set to B<true> the range of acceptable values is inverted, i.E<nbsp>e.
8139 values between B<FailureMin> and B<FailureMax> (B<WarningMin> and
8140 B<WarningMax>) are not okay. Defaults to B<false>.
8142 =item B<Persist> B<true>|B<false>
8144 Sets how often notifications are generated. If set to B<true> one notification
8145 will be generated for each value that is out of the acceptable range. If set to
8146 B<false> (the default) then a notification is only generated if a value is out
8147 of range but the previous value was okay.
8149 This applies to missing values, too: If set to B<true> a notification about a
8150 missing value is generated once every B<Interval> seconds. If set to B<false>
8151 only one such notification is generated until the value appears again.
8153 =item B<Percentage> B<true>|B<false>
8155 If set to B<true>, the minimum and maximum values given are interpreted as
8156 percentage value, relative to the other data sources. This is helpful for
8157 example for the "df" type, where you may want to issue a warning when less than
8158 5E<nbsp>% of the total space is available. Defaults to B<false>.
8160 =item B<Hits> I<Number>
8162 Delay creating the notification until the threshold has been passed I<Number>
8163 times. When a notification has been generated, or when a subsequent value is
8164 inside the threshold, the counter is reset. If, for example, a value is
8165 collected once every 10E<nbsp>seconds and B<Hits> is set to 3, a notification
8166 will be dispatched at most once every 30E<nbsp>seconds.
8168 This is useful when short bursts are not a problem. If, for example, 100% CPU
8169 usage for up to a minute is normal (and data is collected every
8170 10E<nbsp>seconds), you could set B<Hits> to B<6> to account for this.
8172 =item B<Hysteresis> I<Number>
8174 When set to non-zero, a hysteresis value is applied when checking minimum and
8175 maximum bounds. This is useful for values that increase slowly and fluctuate a
8176 bit while doing so. When these values come close to the threshold, they may
8177 "flap", i.e. switch between failure / warning case and okay case repeatedly.
8179 If, for example, the threshold is configures as
8184 then a I<Warning> notification is created when the value exceeds I<101> and the
8185 corresponding I<Okay> notification is only created once the value falls below
8186 I<99>, thus avoiding the "flapping".
8190 =head1 FILTER CONFIGURATION
8192 Starting with collectd 4.6 there is a powerful filtering infrastructure
8193 implemented in the daemon. The concept has mostly been copied from
8194 I<ip_tables>, the packet filter infrastructure for Linux. We'll use a similar
8195 terminology, so that users that are familiar with iptables feel right at home.
8199 The following are the terms used in the remainder of the filter configuration
8200 documentation. For an ASCII-art schema of the mechanism, see
8201 L<"General structure"> below.
8207 A I<match> is a criteria to select specific values. Examples are, of course, the
8208 name of the value or it's current value.
8210 Matches are implemented in plugins which you have to load prior to using the
8211 match. The name of such plugins starts with the "match_" prefix.
8215 A I<target> is some action that is to be performed with data. Such actions
8216 could, for example, be to change part of the value's identifier or to ignore
8217 the value completely.
8219 Some of these targets are built into the daemon, see L<"Built-in targets">
8220 below. Other targets are implemented in plugins which you have to load prior to
8221 using the target. The name of such plugins starts with the "target_" prefix.
8225 The combination of any number of matches and at least one target is called a
8226 I<rule>. The target actions will be performed for all values for which B<all>
8227 matches apply. If the rule does not have any matches associated with it, the
8228 target action will be performed for all values.
8232 A I<chain> is a list of rules and possibly default targets. The rules are tried
8233 in order and if one matches, the associated target will be called. If a value
8234 is handled by a rule, it depends on the target whether or not any subsequent
8235 rules are considered or if traversal of the chain is aborted, see
8236 L<"Flow control"> below. After all rules have been checked, the default targets
8241 =head2 General structure
8243 The following shows the resulting structure:
8250 +---------+ +---------+ +---------+ +---------+
8251 ! Rule !->! Match !->! Match !->! Target !
8252 +---------+ +---------+ +---------+ +---------+
8255 +---------+ +---------+ +---------+
8256 ! Rule !->! Target !->! Target !
8257 +---------+ +---------+ +---------+
8264 +---------+ +---------+ +---------+
8265 ! Rule !->! Match !->! Target !
8266 +---------+ +---------+ +---------+
8276 There are four ways to control which way a value takes through the filter
8283 The built-in B<jump> target can be used to "call" another chain, i.E<nbsp>e.
8284 process the value with another chain. When the called chain finishes, usually
8285 the next target or rule after the jump is executed.
8289 The stop condition, signaled for example by the built-in target B<stop>, causes
8290 all processing of the value to be stopped immediately.
8294 Causes processing in the current chain to be aborted, but processing of the
8295 value generally will continue. This means that if the chain was called via
8296 B<Jump>, the next target or rule after the jump will be executed. If the chain
8297 was not called by another chain, control will be returned to the daemon and it
8298 may pass the value to another chain.
8302 Most targets will signal the B<continue> condition, meaning that processing
8303 should continue normally. There is no special built-in target for this
8310 The configuration reflects this structure directly:
8312 PostCacheChain "PostCache"
8314 <Rule "ignore_mysql_show">
8317 Type "^mysql_command$"
8318 TypeInstance "^show_"
8328 The above configuration example will ignore all values where the plugin field
8329 is "mysql", the type is "mysql_command" and the type instance begins with
8330 "show_". All other values will be sent to the C<rrdtool> write plugin via the
8331 default target of the chain. Since this chain is run after the value has been
8332 added to the cache, the MySQL C<show_*> command statistics will be available
8333 via the C<unixsock> plugin.
8335 =head2 List of configuration options
8339 =item B<PreCacheChain> I<ChainName>
8341 =item B<PostCacheChain> I<ChainName>
8343 Configure the name of the "pre-cache chain" and the "post-cache chain". The
8344 argument is the name of a I<chain> that should be executed before and/or after
8345 the values have been added to the cache.
8347 To understand the implications, it's important you know what is going on inside
8348 I<collectd>. The following diagram shows how values are passed from the
8349 read-plugins to the write-plugins:
8355 + - - - - V - - - - +
8356 : +---------------+ :
8359 : +-------+-------+ :
8362 : +-------+-------+ : +---------------+
8363 : ! Cache !--->! Value Cache !
8364 : ! insert ! : +---+---+-------+
8365 : +-------+-------+ : ! !
8366 : ! ,------------' !
8368 : +-------+---+---+ : +-------+-------+
8369 : ! Post-Cache +--->! Write-Plugins !
8370 : ! Chain ! : +---------------+
8371 : +---------------+ :
8374 + - - - - - - - - - +
8376 After the values are passed from the "read" plugins to the dispatch functions,
8377 the pre-cache chain is run first. The values are added to the internal cache
8378 afterwards. The post-cache chain is run after the values have been added to the
8379 cache. So why is it such a huge deal if chains are run before or after the
8380 values have been added to this cache?
8382 Targets that change the identifier of a value list should be executed before
8383 the values are added to the cache, so that the name in the cache matches the
8384 name that is used in the "write" plugins. The C<unixsock> plugin, too, uses
8385 this cache to receive a list of all available values. If you change the
8386 identifier after the value list has been added to the cache, this may easily
8387 lead to confusion, but it's not forbidden of course.
8389 The cache is also used to convert counter values to rates. These rates are, for
8390 example, used by the C<value> match (see below). If you use the rate stored in
8391 the cache B<before> the new value is added, you will use the old, B<previous>
8392 rate. Write plugins may use this rate, too, see the C<csv> plugin, for example.
8393 The C<unixsock> plugin uses these rates too, to implement the C<GETVAL>
8396 Last but not last, the B<stop> target makes a difference: If the pre-cache
8397 chain returns the stop condition, the value will not be added to the cache and
8398 the post-cache chain will not be run.
8400 =item B<Chain> I<Name>
8402 Adds a new chain with a certain name. This name can be used to refer to a
8403 specific chain, for example to jump to it.
8405 Within the B<Chain> block, there can be B<Rule> blocks and B<Target> blocks.
8407 =item B<Rule> [I<Name>]
8409 Adds a new rule to the current chain. The name of the rule is optional and
8410 currently has no meaning for the daemon.
8412 Within the B<Rule> block, there may be any number of B<Match> blocks and there
8413 must be at least one B<Target> block.
8415 =item B<Match> I<Name>
8417 Adds a match to a B<Rule> block. The name specifies what kind of match should
8418 be performed. Available matches depend on the plugins that have been loaded.
8420 The arguments inside the B<Match> block are passed to the plugin implementing
8421 the match, so which arguments are valid here depends on the plugin being used.
8422 If you do not need any to pass any arguments to a match, you can use the
8427 Which is equivalent to:
8432 =item B<Target> I<Name>
8434 Add a target to a rule or a default target to a chain. The name specifies what
8435 kind of target is to be added. Which targets are available depends on the
8436 plugins being loaded.
8438 The arguments inside the B<Target> block are passed to the plugin implementing
8439 the target, so which arguments are valid here depends on the plugin being used.
8440 If you do not need any to pass any arguments to a target, you can use the
8445 This is the same as writing:
8452 =head2 Built-in targets
8454 The following targets are built into the core daemon and therefore need no
8455 plugins to be loaded:
8461 Signals the "return" condition, see the L<"Flow control"> section above. This
8462 causes the current chain to stop processing the value and returns control to
8463 the calling chain. The calling chain will continue processing targets and rules
8464 just after the B<jump> target (see below). This is very similar to the
8465 B<RETURN> target of iptables, see L<iptables(8)>.
8467 This target does not have any options.
8475 Signals the "stop" condition, see the L<"Flow control"> section above. This
8476 causes processing of the value to be aborted immediately. This is similar to
8477 the B<DROP> target of iptables, see L<iptables(8)>.
8479 This target does not have any options.
8487 Sends the value to "write" plugins.
8493 =item B<Plugin> I<Name>
8495 Name of the write plugin to which the data should be sent. This option may be
8496 given multiple times to send the data to more than one write plugin. If the
8497 plugin supports multiple instances, the plugin's instance(s) must also be
8502 If no plugin is explicitly specified, the values will be sent to all available
8505 Single-instance plugin example:
8511 Multi-instance plugin example:
8513 <Plugin "write_graphite">
8523 Plugin "write_graphite/foo"
8528 Starts processing the rules of another chain, see L<"Flow control"> above. If
8529 the end of that chain is reached, or a stop condition is encountered,
8530 processing will continue right after the B<jump> target, i.E<nbsp>e. with the
8531 next target or the next rule. This is similar to the B<-j> command line option
8532 of iptables, see L<iptables(8)>.
8538 =item B<Chain> I<Name>
8540 Jumps to the chain I<Name>. This argument is required and may appear only once.
8552 =head2 Available matches
8558 Matches a value using regular expressions.
8564 =item B<Host> I<Regex>
8566 =item B<Plugin> I<Regex>
8568 =item B<PluginInstance> I<Regex>
8570 =item B<Type> I<Regex>
8572 =item B<TypeInstance> I<Regex>
8574 Match values where the given regular expressions match the various fields of
8575 the identifier of a value. If multiple regular expressions are given, B<all>
8576 regexen must match for a value to match.
8578 =item B<Invert> B<false>|B<true>
8580 When set to B<true>, the result of the match is inverted, i.e. all value lists
8581 where all regular expressions apply are not matched, all other value lists are
8582 matched. Defaults to B<false>.
8589 Host "customer[0-9]+"
8595 Matches values that have a time which differs from the time on the server.
8597 This match is mainly intended for servers that receive values over the
8598 C<network> plugin and write them to disk using the C<rrdtool> plugin. RRDtool
8599 is very sensitive to the timestamp used when updating the RRD files. In
8600 particular, the time must be ever increasing. If a misbehaving client sends one
8601 packet with a timestamp far in the future, all further packets with a correct
8602 time will be ignored because of that one packet. What's worse, such corrupted
8603 RRD files are hard to fix.
8605 This match lets one match all values B<outside> a specified time range
8606 (relative to the server's time), so you can use the B<stop> target (see below)
8607 to ignore the value, for example.
8613 =item B<Future> I<Seconds>
8615 Matches all values that are I<ahead> of the server's time by I<Seconds> or more
8616 seconds. Set to zero for no limit. Either B<Future> or B<Past> must be
8619 =item B<Past> I<Seconds>
8621 Matches all values that are I<behind> of the server's time by I<Seconds> or
8622 more seconds. Set to zero for no limit. Either B<Future> or B<Past> must be
8634 This example matches all values that are five minutes or more ahead of the
8635 server or one hour (or more) lagging behind.
8639 Matches the actual value of data sources against given minimumE<nbsp>/ maximum
8640 values. If a data-set consists of more than one data-source, all data-sources
8641 must match the specified ranges for a positive match.
8647 =item B<Min> I<Value>
8649 Sets the smallest value which still results in a match. If unset, behaves like
8652 =item B<Max> I<Value>
8654 Sets the largest value which still results in a match. If unset, behaves like
8657 =item B<Invert> B<true>|B<false>
8659 Inverts the selection. If the B<Min> and B<Max> settings result in a match,
8660 no-match is returned and vice versa. Please note that the B<Invert> setting
8661 only effects how B<Min> and B<Max> are applied to a specific value. Especially
8662 the B<DataSource> and B<Satisfy> settings (see below) are not inverted.
8664 =item B<DataSource> I<DSName> [I<DSName> ...]
8666 Select one or more of the data sources. If no data source is configured, all
8667 data sources will be checked. If the type handled by the match does not have a
8668 data source of the specified name(s), this will always result in no match
8669 (independent of the B<Invert> setting).
8671 =item B<Satisfy> B<Any>|B<All>
8673 Specifies how checking with several data sources is performed. If set to
8674 B<Any>, the match succeeds if one of the data sources is in the configured
8675 range. If set to B<All> the match only succeeds if all data sources are within
8676 the configured range. Default is B<All>.
8678 Usually B<All> is used for positive matches, B<Any> is used for negative
8679 matches. This means that with B<All> you usually check that all values are in a
8680 "good" range, while with B<Any> you check if any value is within a "bad" range
8681 (or outside the "good" range).
8685 Either B<Min> or B<Max>, but not both, may be unset.
8689 # Match all values smaller than or equal to 100. Matches only if all data
8690 # sources are below 100.
8696 # Match if the value of any data source is outside the range of 0 - 100.
8704 =item B<empty_counter>
8706 Matches all values with one or more data sources of type B<COUNTER> and where
8707 all counter values are zero. These counters usually I<never> increased since
8708 they started existing (and are therefore uninteresting), or got reset recently
8709 or overflowed and you had really, I<really> bad luck.
8711 Please keep in mind that ignoring such counters can result in confusing
8712 behavior: Counters which hardly ever increase will be zero for long periods of
8713 time. If the counter is reset for some reason (machine or service restarted,
8714 usually), the graph will be empty (NAN) for a long time. People may not
8719 Calculates a hash value of the host name and matches values according to that
8720 hash value. This makes it possible to divide all hosts into groups and match
8721 only values that are in a specific group. The intended use is in load
8722 balancing, where you want to handle only part of all data and leave the rest
8725 The hashing function used tries to distribute the hosts evenly. First, it
8726 calculates a 32E<nbsp>bit hash value using the characters of the hostname:
8729 for (i = 0; host[i] != 0; i++)
8730 hash_value = (hash_value * 251) + host[i];
8732 The constant 251 is a prime number which is supposed to make this hash value
8733 more random. The code then checks the group for this host according to the
8734 I<Total> and I<Match> arguments:
8736 if ((hash_value % Total) == Match)
8741 Please note that when you set I<Total> to two (i.E<nbsp>e. you have only two
8742 groups), then the least significant bit of the hash value will be the XOR of
8743 all least significant bits in the host name. One consequence is that when you
8744 have two hosts, "server0.example.com" and "server1.example.com", where the host
8745 name differs in one digit only and the digits differ by one, those hosts will
8746 never end up in the same group.
8752 =item B<Match> I<Match> I<Total>
8754 Divide the data into I<Total> groups and match all hosts in group I<Match> as
8755 described above. The groups are numbered from zero, i.E<nbsp>e. I<Match> must
8756 be smaller than I<Total>. I<Total> must be at least one, although only values
8757 greater than one really do make any sense.
8759 You can repeat this option to match multiple groups, for example:
8764 The above config will divide the data into seven groups and match groups three
8765 and five. One use would be to keep every value on two hosts so that if one
8766 fails the missing data can later be reconstructed from the second host.
8772 # Operate on the pre-cache chain, so that ignored values are not even in the
8777 # Divide all received hosts in seven groups and accept all hosts in
8781 # If matched: Return and continue.
8784 # If not matched: Return and stop.
8790 =head2 Available targets
8794 =item B<notification>
8796 Creates and dispatches a notification.
8802 =item B<Message> I<String>
8804 This required option sets the message of the notification. The following
8805 placeholders will be replaced by an appropriate value:
8813 =item B<%{plugin_instance}>
8817 =item B<%{type_instance}>
8819 These placeholders are replaced by the identifier field of the same name.
8821 =item B<%{ds:>I<name>B<}>
8823 These placeholders are replaced by a (hopefully) human readable representation
8824 of the current rate of this data source. If you changed the instance name
8825 (using the B<set> or B<replace> targets, see below), it may not be possible to
8826 convert counter values to rates.
8830 Please note that these placeholders are B<case sensitive>!
8832 =item B<Severity> B<"FAILURE">|B<"WARNING">|B<"OKAY">
8834 Sets the severity of the message. If omitted, the severity B<"WARNING"> is
8841 <Target "notification">
8842 Message "Oops, the %{type_instance} temperature is currently %{ds:value}!"
8848 Replaces parts of the identifier using regular expressions.
8854 =item B<Host> I<Regex> I<Replacement>
8856 =item B<Plugin> I<Regex> I<Replacement>
8858 =item B<PluginInstance> I<Regex> I<Replacement>
8860 =item B<TypeInstance> I<Regex> I<Replacement>
8862 Match the appropriate field with the given regular expression I<Regex>. If the
8863 regular expression matches, that part that matches is replaced with
8864 I<Replacement>. If multiple places of the input buffer match a given regular
8865 expression, only the first occurrence will be replaced.
8867 You can specify each option multiple times to use multiple regular expressions
8875 # Replace "example.net" with "example.com"
8876 Host "\\<example.net\\>" "example.com"
8878 # Strip "www." from hostnames
8884 Sets part of the identifier of a value to a given string.
8890 =item B<Host> I<String>
8892 =item B<Plugin> I<String>
8894 =item B<PluginInstance> I<String>
8896 =item B<TypeInstance> I<String>
8898 Set the appropriate field to the given string. The strings for plugin instance
8899 and type instance may be empty, the strings for host and plugin may not be
8900 empty. It's currently not possible to set the type of a value this way.
8907 PluginInstance "coretemp"
8908 TypeInstance "core3"
8913 =head2 Backwards compatibility
8915 If you use collectd with an old configuration, i.E<nbsp>e. one without a
8916 B<Chain> block, it will behave as it used to. This is equivalent to the
8917 following configuration:
8923 If you specify a B<PostCacheChain>, the B<write> target will not be added
8924 anywhere and you will have to make sure that it is called where appropriate. We
8925 suggest to add the above snippet as default target to your "PostCache" chain.
8929 Ignore all values, where the hostname does not contain a dot, i.E<nbsp>e. can't
8945 L<collectd-exec(5)>,
8946 L<collectd-perl(5)>,
8947 L<collectd-unixsock(5)>,
8960 Florian Forster E<lt>octo@collectd.orgE<gt>