3 collectd.conf - Configuration for the system statistics collection daemon B<collectd>
7 BaseDir "/path/to/data/"
8 PIDFile "/path/to/pidfile/collectd.pid"
9 Server "123.123.123.123" 12345
22 This config file controls how the system statistics collection daemon
23 B<collectd> behaves. The most significant option is B<LoadPlugin>, which
24 controls which plugins to load. These plugins ultimately define collectd's
27 The syntax of this config file is similar to the config file of the famous
28 B<Apache Webserver>. Each line contains either a key-value-pair or a
29 section-start or -end. Empty lines and everything after the hash-symbol `#' is
30 ignored. Values are either string, enclosed in double-quotes,
31 (floating-point-)numbers or a boolean expression, i.E<nbsp>e. either B<true> or
32 B<false>. String containing of only alphanumeric characters and underscores do
33 not need to be quoted. Lines may be wrapped by using `\' as the last character
34 before the newline. This allows long lines to be split into multiple lines.
35 Quoted strings may be wrapped as well. However, those are treated special in
36 that whitespace at the beginning of the following lines will be ignored, which
37 allows for nicely indenting the wrapped lines.
39 The configuration is read and processed in order, i.E<nbsp>e. from top to
40 bottom. So the plugins are loaded in the order listed in this config file. It
41 is a good idea to load any logging plugins first in order to catch messages
42 from plugins during configuration. Also, the C<LoadPlugin> option B<must> occur
43 B<before> the C<E<lt>Plugin ...E<gt>> block.
49 =item B<BaseDir> I<Directory>
51 Sets the base directory. This is the directory beneath all RRD-files are
52 created. Possibly more subdirectories are created. This is also the working
53 directory for the daemon.
55 =item B<LoadPlugin> I<Plugin>
57 Loads the plugin I<Plugin>. There must be at least one such line or B<collectd>
58 will be mostly useless.
60 =item B<Include> I<Path>
62 If I<Path> points to a file, includes that file. If I<Path> points to a
63 directory, recursively includes all files within that directory and its
64 subdirectories. If the C<wordexp> function is available on your system,
65 shell-like wildcards are expanded before files are included. This means you can
66 use statements like the following:
68 Include "/etc/collectd.d/*.conf"
70 If more than one files are included by a single B<Include> option, the files
71 will be included in lexicographical order (as defined by the C<strcmp>
72 function). Thus, you can e.E<nbsp>g. use numbered prefixes to specify the
73 order in which the files are loaded.
75 To prevent loops and shooting yourself in the foot in interesting ways the
76 nesting is limited to a depth of 8E<nbsp>levels, which should be sufficient for
77 most uses. Since symlinks are followed it is still possible to crash the daemon
78 by looping symlinks. In our opinion significant stupidity should result in an
79 appropriate amount of pain.
81 It is no problem to have a block like C<E<lt>Plugin fooE<gt>> in more than one
82 file, but you cannot include files from within blocks.
84 =item B<PIDFile> I<File>
86 Sets where to write the PID file to. This file is overwritten when it exists
87 and deleted when the program is stopped. Some init-scripts might override this
88 setting using the B<-P> command-line option.
90 =item B<PluginDir> I<Directory>
92 Path to the plugins (shared objects) of collectd.
94 =item B<TypesDB> I<File> [I<File> ...]
96 Set one or more files that contain the data-set descriptions. See
97 L<types.db(5)> for a description of the format of this file.
99 =item B<Interval> I<Seconds>
101 Configures the interval in which to query the read plugins. Obviously smaller
102 values lead to a higher system load produced by collectd, while higher values
103 lead to more coarse statistics.
105 =item B<ReadThreads> I<Num>
107 Number of threads to start for reading plugins. The default value is B<5>, but
108 you may want to increase this if you have more than five plugins that take a
109 long time to read. Mostly those are plugin that do network-IO. Setting this to
110 a value higher than the number of plugins you've loaded is totally useless.
112 =item B<Hostname> I<Name>
114 Sets the hostname that identifies a host. If you omit this setting, the
115 hostname will be determinded using the L<gethostname(2)> system call.
117 =item B<FQDNLookup> B<true|false>
119 If B<Hostname> is determined automatically this setting controls whether or not
120 the daemon should try to figure out the "fully qualified domain name", FQDN.
121 This is done using a lookup of the name returned by C<gethostname>.
123 Using this feature (i.E<nbsp>e. setting this option to B<true>) is recommended.
124 However, to preserve backwards compatibility the default is set to B<false>.
125 The sample config file that is installed with C<makeE<nbsp>install> includes a
126 line which sets this option, though, so that default installations will have
127 this setting enabled.
129 =item B<PreCacheChain> I<ChainName>
131 =item B<PostCacheChain> I<ChainName>
133 Configure the name of the "pre-cache chain" and the "post-cache chain". Please
134 see L<FILTER CONFIGURATION> below on information on chains and how these
135 setting change the daemon's behavior.
139 =head1 PLUGIN OPTIONS
141 Some plugins may register own options. These options must be enclosed in a
142 C<Plugin>-Section. Which options exist depends on the plugin used. Some plugins
143 require external configuration, too. The C<apache plugin>, for example,
144 required C<mod_status> to be configured in the webserver you're going to
145 collect data from. These plugins are listed below as well, even if they don't
146 require any configuration within collectd's configfile.
148 A list of all plugins and a short summary for each plugin can be found in the
149 F<README> file shipped with the sourcecode and hopefully binary packets as
152 =head2 Plugin C<apache>
154 To configure the C<apache>-plugin you first need to configure the Apache
155 webserver correctly. The Apache-plugin C<mod_status> needs to be loaded and
156 working and the C<ExtendedStatus> directive needs to be B<enabled>. You can use
157 the following snipped to base your Apache config upon:
160 <IfModule mod_status.c>
161 <Location /mod_status>
162 SetHandler server-status
166 Since its C<mod_status> module is very similar to Apache's, B<lighttpd> is
167 also supported. It introduces a new field, called C<BusyServers>, to count the
168 number of currently connected clients. This field is also supported.
170 The following options are accepted by the C<apache>-plugin:
174 =item B<URL> I<http://host/mod_status?auto>
176 Sets the URL of the C<mod_status> output. This needs to be the output generated
177 by C<ExtendedStatus on> and it needs to be the machine readable output
178 generated by appending the C<?auto> argument.
180 =item B<User> I<Username>
182 Optional user name needed for authentication.
184 =item B<Password> I<Password>
186 Optional password needed for authentication.
188 =item B<VerifyPeer> B<true|false>
190 Enable or disable peer SSL certificate verification. See
191 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
193 =item B<VerifyHost> B<true|false>
195 Enable or disable peer host name verification. If enabled, the plugin checks
196 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
197 certificate matches the host name provided by the B<URL> option. If this
198 identity check fails, the connection is aborted. Obviously, only works when
199 connecting to a SSL enabled server. Enabled by default.
201 =item B<CACert> I<File>
203 File that holds one or more SSL certificates. If you want to use HTTPS you will
204 possibly need this option. What CA certificates come bundled with C<libcurl>
205 and are checked by default depends on the distribution you use.
209 =head2 Plugin C<apcups>
213 =item B<Host> I<Hostname>
215 Hostname of the host running B<apcupsd>. Defaults to B<localhost>. Please note
216 that IPv6 support has been disabled unless someone can confirm or decline that
217 B<apcupsd> can handle it.
219 =item B<Port> I<Port>
221 TCP-Port to connect to. Defaults to B<3551>.
225 =head2 Plugin C<ascent>
227 This plugin collects information about an Ascent server, a free server for the
228 "World of Warcraft" game. This plugin gathers the information by fetching the
229 XML status page using C<libcurl> and parses it using C<libxml2>.
231 The configuration options are the same as for the C<apache> plugin above:
235 =item B<URL> I<http://localhost/ascent/status/>
237 Sets the URL of the XML status output.
239 =item B<User> I<Username>
241 Optional user name needed for authentication.
243 =item B<Password> I<Password>
245 Optional password needed for authentication.
247 =item B<VerifyPeer> B<true|false>
249 Enable or disable peer SSL certificate verification. See
250 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
252 =item B<VerifyHost> B<true|false>
254 Enable or disable peer host name verification. If enabled, the plugin checks
255 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
256 certificate matches the host name provided by the B<URL> option. If this
257 identity check fails, the connection is aborted. Obviously, only works when
258 connecting to a SSL enabled server. Enabled by default.
260 =item B<CACert> I<File>
262 File that holds one or more SSL certificates. If you want to use HTTPS you will
263 possibly need this option. What CA certificates come bundled with C<libcurl>
264 and are checked by default depends on the distribution you use.
268 =head2 Plugin C<bind>
270 Starting with BIND 9.5.0, the most widely used DNS server software provides
271 extensive statistics about queries, responses and lots of other information.
272 The bind plugin retrieves this information that's encoded in XML and provided
273 via HTTP and submits the values to collectd.
275 To use this plugin, you first need to tell BIND to make this information
276 available. This is done with the C<statistics-channels> configuration option:
278 statistics-channels {
279 inet localhost port 8053;
282 The configuration follows the grouping that can be seen when looking at the
283 data with an XSLT compatible viewer, such as a modern web browser. It's
284 probably a good idea to make yourself familiar with the provided values, so you
285 can understand what the collected statistics actually mean.
290 URL "http://localhost:8053/"
304 Zone "127.in-addr.arpa/IN"
308 The bind plugin accepts the following configuration options:
314 URL from which to retrieve the XML data. If not specified,
315 C<http://localhost:8053/> will be used.
317 =item B<OpCodes> I<true>|I<false>
319 When enabled, statistics about the I<"OpCodes">, for example the number of
320 C<QUERY> packets, are collected.
324 =item B<QTypes> I<true>|I<false>
326 When enabled, the number of I<incoming> queries by query types (for example
327 C<A>, C<MX>, C<AAAA>) is collected.
331 =item B<ServerStats> I<true>|I<false>
333 Collect global server statistics, such as requests received over IPv4 and IPv6,
334 successful queries, and failed updates.
338 =item B<ZoneMaintStats> I<true>|I<false>
340 Collect zone maintenance statistics, mostly information about notifications
341 (zone updates) and zone transfers.
345 =item B<ResolverStats> I<true>|I<false>
347 Collect resolver statistics, i.E<nbsp>e. statistics about outgoing requests
348 (e.E<nbsp>g. queries over IPv4, lame servers). Since the global resolver
349 counters apparently were removed in BIND 9.5.1 and 9.6.0, this is disabled by
350 default. Use the B<ResolverStats> option within a B<View "_default"> block
351 instead for the same functionality.
357 Collect global memory statistics.
361 =item B<View> I<Name>
363 Collect statistics about a specific I<"view">. BIND can behave different,
364 mostly depending on the source IP-address of the request. These different
365 configurations are called "views". If you don't use this feature, you most
366 likely are only interested in the C<_default> view.
368 Within a E<lt>B<View>E<nbsp>I<name>E<gt> block, you can specify which
369 information you want to collect about a view. If no B<View> block is
370 configured, no detailed view statistics will be collected.
374 =item B<QTypes> I<true>|I<false>
376 If enabled, the number of I<outgoing> queries by query type (e.E<nbsp>g. C<A>,
381 =item B<ResolverStats> I<true>|I<false>
383 Collect resolver statistics, i.E<nbsp>e. statistics about outgoing requests
384 (e.E<nbsp>g. queries over IPv4, lame servers).
388 =item B<CacheRRSets> I<true>|I<false>
390 If enabled, the number of entries (I<"RR sets">) in the view's cache by query
391 type is collected. Negative entries (queries which resulted in an error, for
392 example names that do not exist) are reported with a leading exclamation mark,
397 =item B<Zone> I<Name>
399 When given, collect detailed information about the given zone in the view. The
400 information collected if very similar to the global B<ServerStats> information
403 You can repeat this option to collect detailed information about multiple
406 By default no detailed zone information is collected.
412 =head2 Plugin C<couchdb>
414 The couchdb plugin uses B<libcurl> (L<http://curl.haxx.se/>) and B<libyajl>
415 (L<http://www.lloydforge.org/projects/yajl/>) to collect values from CouchDB
416 documents (stored JSON notation).
418 The following example will collect several values from the built-in `_stats'
419 runtime statistics module (L<http://wiki.apache.org/couchdb/Runtime_Statistics>).
422 <URL "http://localhost:5984/_stats">
424 <Key "httpd/requests/count">
428 <Key "httpd_request_methods/*/count">
429 Type "http_request_methods"
432 <Key "httpd_status_codes/*/count">
433 Type "http_response_codes"
438 The following example will collect the status values from each database:
440 <URL "http://localhost:5984/_all_dbs">
445 <Key "*/doc_del_count">
453 In the B<Plugin> block, there may be one or more B<URL> blocks, each defining
454 a URL to be fetched via HTTP (libcurl) and one or more B<Key> blocks.
455 The B<Key> string argument must be in a path format, of which is used to collect
456 a value from a JSON map object. If a B<Key> path element is that of a I<*> wildcard,
457 the values for all keys will be collectd.
459 The following options are valid within B<URL> blocks:
463 =item B<Instance> I<Instance>
465 Sets the plugin instance to I<Instance>.
467 =item B<User> I<Name>
469 Username to use if authorization is required to read the page.
471 =item B<Password> I<Password>
473 Password to use if authorization is required to read the page.
475 =item B<VerifyPeer> B<true>|B<false>
477 Enable or disable peer SSL certificate verification. See
478 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
480 =item B<VerifyHost> B<true>|B<false>
482 Enable or disable peer host name verification. If enabled, the plugin checks if
483 the C<Common Name> or a C<Subject Alternate Name> field of the SSL certificate
484 matches the host name provided by the B<URL> option. If this identity check
485 fails, the connection is aborted. Obviously, only works when connecting to a
486 SSL enabled server. Enabled by default.
488 =item B<CACert> I<file>
490 File that holds one or more SSL certificates. If you want to use HTTPS you will
491 possibly need this option. What CA certificates come bundled with C<libcurl>
492 and are checked by default depends on the distribution you use.
496 The following options are valid within B<Key> blocks:
500 =item B<Type> I<Type>
502 Sets the type used to dispatch the values to the daemon. Detailed information
503 about types and their configuration can be found in L<types.db(5)>. This
506 =item B<Instance> I<Instance>
508 Type-instance to use. Defaults to the current map key or current string array element value.
512 =head2 Plugin C<cpufreq>
514 This plugin doesn't have any options. It reads
515 F</sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq> (for the first CPU
516 installed) to get the current CPU frequency. If this file does not exist make
517 sure B<cpufreqd> (L<http://cpufreqd.sourceforge.net/>) or a similar tool is
518 installed and an "cpu governor" (that's a kernel module) is loaded.
524 =item B<DataDir> I<Directory>
526 Set the directory to store CSV-files under. Per default CSV-files are generated
527 beneath the daemon's working directory, i.E<nbsp>e. the B<BaseDir>.
528 The special strings B<stdout> and B<stderr> can be used to write to the standard
529 output and standard error channels, respectively. This, of course, only makes
530 much sense when collectd is running in foreground- or non-daemon-mode.
532 =item B<StoreRates> B<true|false>
534 If set to B<true>, convert counter values to rates. If set to B<false> (the
535 default) counter values are stored as is, i.E<nbsp>e. as an increasing integer
540 =head2 Plugin C<curl>
542 The curl plugin uses the B<libcurl> (L<http://curl.haxx.se/>) to read web pages
543 and the match infrastructure (the same code used by the tail plugin) to use
544 regular expressions with the received data.
546 The following example will read the current value of AMD stock from google's
547 finance page and dispatch the value to collectd.
550 <Page "stock_quotes">
551 URL "http://finance.google.com/finance?q=NYSE%3AAMD"
555 Regex "<span +class=\"pr\"[^>]*> *([0-9]*\\.[0-9]+) *</span>"
556 DSType "GaugeAverage"
557 # Note: `stock_value' is not a standard type.
564 In the B<Plugin> block, there may be one or more B<Page> blocks, each defining
565 a web page and one or more "matches" to be performed on the returned data. The
566 string argument to the B<Page> block is used as plugin instance.
568 The following options are valid within B<Page> blocks:
574 URL of the web site to retrieve. Since a regular expression will be used to
575 extract information from this data, non-binary data is a big plus here ;)
577 =item B<User> I<Name>
579 Username to use if authorization is required to read the page.
581 =item B<Password> I<Password>
583 Password to use if authorization is required to read the page.
585 =item B<VerifyPeer> B<true>|B<false>
587 Enable or disable peer SSL certificate verification. See
588 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
590 =item B<VerifyHost> B<true>|B<false>
592 Enable or disable peer host name verification. If enabled, the plugin checks if
593 the C<Common Name> or a C<Subject Alternate Name> field of the SSL certificate
594 matches the host name provided by the B<URL> option. If this identity check
595 fails, the connection is aborted. Obviously, only works when connecting to a
596 SSL enabled server. Enabled by default.
598 =item B<CACert> I<file>
600 File that holds one or more SSL certificates. If you want to use HTTPS you will
601 possibly need this option. What CA certificates come bundled with C<libcurl>
602 and are checked by default depends on the distribution you use.
604 =item B<E<lt>MatchE<gt>>
606 One or more B<Match> blocks that define how to match information in the data
607 returned by C<libcurl>. The C<curl> plugin uses the same infrastructure that's
608 used by the C<tail> plugin, so please see the documentation of the C<tail>
609 plugin below on how matches are defined.
615 This plugin uses the B<dbi> library (L<http://libdbi.sourceforge.net/>) to
616 connect to various databases, execute I<SQL> statements and read back the
617 results. I<dbi> is an acronym for "database interface" in case you were
618 wondering about the name. You can configure how each column is to be
619 interpreted and the plugin will generate one or more data sets from each row
620 returned according to these rules.
622 Because the plugin is very generic, the configuration is a little more complex
623 than those of other plugins. It usually looks something like this:
626 <Query "out_of_stock">
627 Statement "SELECT category, COUNT(*) AS value FROM products WHERE in_stock = 0 GROUP BY category"
628 # Use with MySQL 5.0.0 or later
632 InstancePrefix "out_of_stock"
633 InstancesFrom "category"
637 <Database "product_information">
639 DriverOption "host" "localhost"
640 DriverOption "username" "collectd"
641 DriverOption "password" "aZo6daiw"
642 DriverOption "dbname" "prod_info"
648 The configuration above defines one query with one result and one database. The
649 query is then linked to the database with the B<Query> option I<within> the
650 B<E<lt>DatabaseE<gt>> block. You can have any number of queries and databases
651 and you can also use the B<Include> statement to split up the configuration
652 file in multiple, smaller files. However, the B<E<lt>QueryE<gt>> block I<must>
653 precede the B<E<lt>DatabaseE<gt>> blocks, because the file is interpreted from
656 The following is a complete list of options:
658 =head3 B<Query> blocks
660 Query blocks define I<SQL> statements and how the returned data should be
661 interpreted. They are identified by the name that is given in the opening line
662 of the block. Thus the name needs to be unique. Other than that, the name is
663 not used in collectd.
665 In each B<Query> block, there is one or more B<Result> blocks. B<Result> blocks
666 define which column holds which value or instance information. You can use
667 multiple B<Result> blocks to create multiple values from one returned row. This
668 is especially useful, when queries take a long time and sending almost the same
669 query again and again is not desirable.
673 <Query "environment">
674 Statement "select station, temperature, humidity from environment"
677 # InstancePrefix "foo"
678 InstancesFrom "station"
679 ValuesFrom "temperature"
683 InstancesFrom "station"
684 ValuesFrom "humidity"
688 The following options are accepted:
692 =item B<Statement> I<SQL>
694 Sets the statement that should be executed on the server. This is B<not>
695 interpreted by collectd, but simply passed to the database server. Therefore,
696 the SQL dialect that's used depends on the server collectd is connected to.
698 The query has to return at least two columns, one for the instance and one
699 value. You cannot omit the instance, even if the statement is guaranteed to
700 always return exactly one line. In that case, you can usually specify something
703 Statement "SELECT \"instance\", COUNT(*) AS value FROM table"
705 (That works with MySQL but may not be valid SQL according to the spec. If you
706 use a more strict database server, you may have to select from a dummy table or
709 Please note that some databases, for example B<Oracle>, will fail if you
710 include a semicolon at the end of the statement.
712 =item B<MinVersion> I<Version>
714 =item B<MaxVersion> I<Value>
716 Only use this query for the specified database version. You can use these
717 options to provide multiple queries with the same name but with a slightly
718 different syntax. The plugin will use only those queries, where the specified
719 minimum and maximum versions fit the version of the database in use.
721 The database version is determined by C<dbi_conn_get_engine_version>, see the
722 L<libdbi documentation|http://libdbi.sourceforge.net/docs/programmers-guide/reference-conn.html#DBI-CONN-GET-ENGINE-VERSION>
723 for details. Basically, each part of the version is assumed to be in the range
724 from B<00> to B<99> and all dots are removed. So version "4.1.2" becomes
725 "40102", version "5.0.42" becomes "50042".
727 B<Warning:> The plugin will use B<all> matching queries, so if you specify
728 multiple queries with the same name and B<overlapping> ranges, weird stuff will
729 happen. Don't to it! A valid example would be something along these lines:
740 In the above example, there are three ranges that don't overlap. The last one
741 goes from version "5.1.0" to infinity, meaning "all later versions". Versions
742 before "4.0.0" are not specified.
744 =item B<Type> I<Type>
746 The B<type> that's used for each line returned. See L<types.db(5)> for more
747 details on how types are defined. In short: A type is a predefined layout of
748 data and the number of values and type of values has to match the type
751 If you specify "temperature" here, you need exactly one gauge column. If you
752 specify "if_octets", you will need two counter columns. See the B<ValuesFrom>
755 There must be exactly one B<Type> option inside each B<Result> block.
757 =item B<InstancePrefix> I<prefix>
759 Prepends I<prefix> to the type instance. If B<InstancesFrom> (see below) is not
760 given, the string is simply copied. If B<InstancesFrom> is given, I<prefix> and
761 all strings returned in the appropriate columns are concatenated together,
762 separated by dashes I<("-")>.
764 =item B<InstancesFrom> I<column0> [I<column1> ...]
766 Specifies the columns whose values will be used to create the "type-instance"
767 for each row. If you specify more than one column, the value of all columns
768 will be joined together with dashes I<("-")> as separation characters.
770 The plugin itself does not check whether or not all built instances are
771 different. It's your responsibility to assure that each is unique. This is
772 especially true, if you do not specify B<InstancesFrom>: B<You> have to make
773 sure that only one row is returned in this case.
775 If neither B<InstancePrefix> nor B<InstancesFrom> is given, the type-instance
778 =item B<ValuesFrom> I<column0> [I<column1> ...]
780 Names the columns whose content is used as the actual data for the data sets
781 that are dispatched to the daemon. How many such columns you need is determined
782 by the B<Type> setting above. If you specify too many or not enough columns,
783 the plugin will complain about that and no data will be submitted to the
786 The actual data type in the columns is not that important. The plugin will
787 automatically cast the values to the right type if it know how to do that. So
788 it should be able to handle integer an floating point types, as well as strings
789 (if they include a number at the beginning).
791 There must be at least one B<ValuesFrom> option inside each B<Result> block.
795 =head3 B<Database> blocks
797 Database blocks define a connection to a database and which queries should be
798 sent to that database. Since the used "dbi" library can handle a wide variety
799 of databases, the configuration is very generic. If in doubt, refer to libdbi's
800 documentationE<nbsp>- we stick as close to the terminology used there.
802 Each database needs a "name" as string argument in the starting tag of the
803 block. This name will be used as "PluginInstance" in the values submitted to
804 the daemon. Other than that, that name is not used.
808 =item B<Driver> I<Driver>
810 Specifies the driver to use to connect to the database. In many cases those
811 drivers are named after the database they can connect to, but this is not a
812 technical necessity. These drivers are sometimes referred to as "DBD",
813 B<D>ataB<B>ase B<D>river, and some distributions ship them in separate
814 packages. Drivers for the "dbi" library are developed by the B<libdbi-drivers>
815 project at L<http://libdbi-drivers.sourceforge.net/>.
817 You need to give the driver name as expected by the "dbi" library here. You
818 should be able to find that in the documentation for each driver. If you
819 mistype the driver name, the plugin will dump a list of all known driver names
822 =item B<DriverOption> I<Key> I<Value>
824 Sets driver-specific options. What option a driver supports can be found in the
825 documentation for each driver, somewhere at
826 L<http://libdbi-drivers.sourceforge.net/>. However, the options "host",
827 "username", "password", and "dbname" seem to be deE<nbsp>facto standards.
829 Unfortunately, drivers are not too keen to report errors when an unknown option
830 is passed to them, so invalid settings here may go unnoticed. This is not the
831 plugin's fault, it will report errors if it gets them from the libraryE<nbsp>/
832 the driver. If a driver complains about an option, the plugin will dump a
833 complete list of all options understood by that driver to the log.
835 =item B<SelectDB> I<Database>
837 In some cases, the database name you connect with is not the database name you
838 want to use for querying data. If this option is set, the plugin will "select"
839 (switch to) that database after the connection is established.
841 =item B<Query> I<QueryName>
843 Associates the query named I<QueryName> with this database connection. The
844 query needs to be defined I<before> this statement, i.E<nbsp>e. all query
845 blocks you want to refer to must be placed above the database block you want to
854 =item B<Device> I<Device>
856 Select partitions based on the devicename.
858 =item B<MountPoint> I<Directory>
860 Select partitions based on the mountpoint.
862 =item B<FSType> I<FSType>
864 Select partitions based on the filesystem type.
866 =item B<IgnoreSelected> I<true>|I<false>
868 Invert the selection: If set to true, all partitions B<except> the ones that
869 match any one of the criteria are collected. By default only selected
870 partitions are collected if a selection is made. If no selection is configured
871 at all, B<all> partitions are selected.
873 =item B<ReportByDevice> I<true>|I<false>
875 Report using the device name rather than the mountpoint. i.e. with this I<false>,
876 (the default), it will report a disk as "root", but with it I<true>, it will be
877 "sda1" (or whichever).
881 =head2 Plugin C<disk>
883 The C<disk> plugin collects information about the usage of physical disks and
884 logical disks (partitions). Values collected are the number of octets written
885 to and read from a disk or partition, the number of read/write operations
886 issued to the disk and a rather complex "time" it took for these commands to be
889 Using the following two options you can ignore some disks or configure the
890 collection only of specific disks.
894 =item B<Disk> I<Name>
896 Select the disk I<Name>. Whether it is collected or ignored depends on the
897 B<IgnoreSelected> setting, see below. As with other plugins that use the
898 daemon's ignorelist functionality, a string that starts and ends with a slash
899 is interpreted as a regular expression. Examples:
904 =item B<IgnoreSelected> B<true>|B<false>
906 Sets whether selected disks, i.E<nbsp>e. the ones matches by any of the B<Disk>
907 statements, are ignored or if all other disks are ignored. The behavior
908 (hopefully) is intuitive: If no B<Disk> option is configured, all disks are
909 collected. If at least one B<Disk> option is given and no B<IgnoreSelected> or
910 set to B<false>, B<only> matching disks will be collected. If B<IgnoreSelected>
911 is set to B<true>, all disks are collected B<except> the ones matched.
919 =item B<Interface> I<Interface>
921 The dns plugin uses B<libpcap> to capture dns traffic and analyses it. This
922 option sets the interface that should be used. If this option is not set, or
923 set to "any", the plugin will try to get packets from B<all> interfaces. This
924 may not work on certain platforms, such as MacE<nbsp>OSE<nbsp>X.
926 =item B<IgnoreSource> I<IP-address>
928 Ignore packets that originate from this address.
930 =item B<SelectNumericQueryTypes> B<true>|B<false>
932 Enabled by default, collects unknown (and thus presented as numeric only) query types.
936 =head2 Plugin C<email>
940 =item B<SocketFile> I<Path>
942 Sets the socket-file which is to be created.
944 =item B<SocketGroup> I<Group>
946 If running as root change the group of the UNIX-socket after it has been
947 created. Defaults to B<collectd>.
949 =item B<SocketPerms> I<Permissions>
951 Change the file permissions of the UNIX-socket after it has been created. The
952 permissions must be given as a numeric, octal value as you would pass to
953 L<chmod(1)>. Defaults to B<0770>.
955 =item B<MaxConns> I<Number>
957 Sets the maximum number of connections that can be handled in parallel. Since
958 this many threads will be started immediately setting this to a very high
959 value will waste valuable resources. Defaults to B<5> and will be forced to be
960 at most B<16384> to prevent typos and dumb mistakes.
964 =head2 Plugin C<exec>
966 Please make sure to read L<collectd-exec(5)> before using this plugin. It
967 contains valuable information on when the executable is executed and the
968 output that is expected from it.
972 =item B<Exec> I<User>[:[I<Group>]] I<Executable> [I<E<lt>argE<gt>> [I<E<lt>argE<gt>> ...]]
974 =item B<NotificationExec> I<User>[:[I<Group>]] I<Executable> [I<E<lt>argE<gt>> [I<E<lt>argE<gt>> ...]]
976 Execute the executable I<Executable> as user I<User>. If the user name is
977 followed by a colon and a group name, the effective group is set to that group.
978 The real group and saved-set group will be set to the default group of that
979 user. If no group is given the effective group ID will be the same as the real
982 Please note that in order to change the user and/or group the daemon needs
983 superuser privileges. If the daemon is run as an unprivileged user you must
984 specify the same user/group here. If the daemon is run with superuser
985 privileges, you must supply a non-root user here.
987 The executable may be followed by optional arguments that are passed to the
988 program. Please note that due to the configuration parsing numbers and boolean
989 values may be changed. If you want to be absolutely sure that something is
990 passed as-is please enclose it in quotes.
992 The B<Exec> and B<NotificationExec> statements change the semantics of the
993 programs executed, i.E<nbsp>e. the data passed to them and the response
994 expected from them. This is documented in great detail in L<collectd-exec(5)>.
998 =head2 Plugin C<filecount>
1000 The C<filecount> plugin counts the number of files in a certain directory (and
1001 its subdirectories) and their combined size. The configuration is very straight
1004 <Plugin "filecount">
1005 <Directory "/var/qmail/queue/mess">
1006 Instance "qmail-message"
1008 <Directory "/var/qmail/queue/todo">
1009 Instance "qmail-todo"
1011 <Directory "/var/lib/php5">
1012 Instance "php5-sessions"
1017 The example above counts the number of files in QMail's queue directories and
1018 the number of PHP5 sessions. Jfiy: The "todo" queue holds the messages that
1019 QMail has not yet looked at, the "message" queue holds the messages that were
1020 classified into "local" and "remote".
1022 As you can see, the configuration consists of one or more C<Directory> blocks,
1023 each of which specifies a directory in which to count the files. Within those
1024 blocks, the following options are recognized:
1028 =item B<Instance> I<Instance>
1030 Sets the plugin instance to I<Instance>. That instance name must be unique, but
1031 it's your responsibility, the plugin doesn't check for that. If not given, the
1032 instance is set to the directory name with all slashes replaced by underscores
1033 and all leading underscores removed.
1035 =item B<Name> I<Pattern>
1037 Only count files that match I<Pattern>, where I<Pattern> is a shell-like
1038 wildcard as understood by L<fnmatch(3)>. Only the B<filename> is checked
1039 against the pattern, not the entire path. In case this makes it easier for you:
1040 This option has been named after the B<-name> parameter to L<find(1)>.
1042 =item B<MTime> I<Age>
1044 Count only files of a specific age: If I<Age> is greater than zero, only files
1045 that haven't been touched in the last I<Age> seconds are counted. If I<Age> is
1046 a negative number, this is inversed. For example, if B<-60> is specified, only
1047 files that have been modified in the last minute will be counted.
1049 The number can also be followed by a "multiplier" to easily specify a larger
1050 timespan. When given in this notation, the argument must in quoted, i.E<nbsp>e.
1051 must be passed as string. So the B<-60> could also be written as B<"-1m"> (one
1052 minute). Valid multipliers are C<s> (second), C<m> (minute), C<h> (hour), C<d>
1053 (day), C<w> (week), and C<y> (year). There is no "month" multiplier. You can
1054 also specify fractional numbers, e.E<nbsp>g. B<"0.5d"> is identical to
1057 =item B<Size> I<Size>
1059 Count only files of a specific size. When I<Size> is a positive number, only
1060 files that are at least this big are counted. If I<Size> is a negative number,
1061 this is inversed, i.E<nbsp>e. only files smaller than the absolute value of
1062 I<Size> are counted.
1064 As with the B<MTime> option, a "multiplier" may be added. For a detailed
1065 description see above. Valid multipliers here are C<b> (byte), C<k> (kilobyte),
1066 C<m> (megabyte), C<g> (gigabyte), C<t> (terabyte), and C<p> (petabyte). Please
1067 note that there are 1000 bytes in a kilobyte, not 1024.
1069 =item B<Recursive> I<true>|I<false>
1071 Controls whether or not to recurse into subdirectories. Enabled by default.
1075 =head2 Plugin C<gmond>
1077 The I<gmond> plugin received the multicast traffic sent by B<gmond>, the
1078 statistics collection daemon of Ganglia. Mappings for the standard "metrics"
1079 are built-in, custom mappings may be added via B<Metric> blocks, see below.
1084 MCReceiveFrom "239.2.11.71" "8649"
1085 <Metric "swap_total">
1087 TypeInstance "total"
1090 <Metric "swap_free">
1097 The following metrics are built-in:
1103 load_one, load_five, load_fifteen
1107 cpu_user, cpu_system, cpu_idle, cpu_nice, cpu_wio
1111 mem_free, mem_shared, mem_buffers, mem_cached, mem_total
1123 Available configuration options:
1127 =item B<MCReceiveFrom> I<MCGroup> [I<Port>]
1129 Sets sets the multicast group and UDP port to which to subscribe.
1131 Default: B<239.2.11.71>E<nbsp>/E<nbsp>B<8649>
1133 =item E<lt>B<Metric> I<Name>E<gt>
1135 These blocks add a new metric conversion to the internal table. I<Name>, the
1136 string argument to the B<Metric> block, is the metric name as used by Ganglia.
1140 =item B<Type> I<Type>
1142 Type to map this metric to. Required.
1144 =item B<TypeInstance> I<Instance>
1146 Type-instance to use. Optional.
1148 =item B<DataSource> I<Name>
1150 Data source to map this metric to. If the configured type has exactly one data
1151 source, this is optional. Otherwise the option is required.
1157 =head2 Plugin C<hddtemp>
1159 To get values from B<hddtemp> collectd connects to B<localhost> (127.0.0.1),
1160 port B<7634/tcp>. The B<Host> and B<Port> options can be used to change these
1161 default values, see below. C<hddtemp> has to be running to work correctly. If
1162 C<hddtemp> is not running timeouts may appear which may interfere with other
1165 The B<hddtemp> homepage can be found at
1166 L<http://www.guzu.net/linux/hddtemp.php>.
1170 =item B<Host> I<Hostname>
1172 Hostname to connect to. Defaults to B<127.0.0.1>.
1174 =item B<Port> I<Port>
1176 TCP-Port to connect to. Defaults to B<7634>.
1178 =item B<TranslateDevicename> I<true>|I<false>
1180 If enabled, translate the disk names to major/minor device numbers
1181 (e.E<nbsp>g. "8-0" for /dev/sda). For backwards compatibility this defaults to
1182 I<true> but it's recommended to disable it as it will probably be removed in
1183 the next major version.
1187 =head2 Plugin C<http>
1189 This output plugin submits values to an http server by POST them using the
1190 PUTVAL plain-text protocol.
1192 The following options are accepted by the C<http>-plugin:
1196 =item B<Location> I<http://example.com/collectd-import>
1198 Set the URL location where values will be sent.
1200 =item B<User> I<Username>
1202 Optional user name needed for authentication.
1204 =item B<Password> I<Password>
1206 Optional password needed for authentication.
1210 =head2 Plugin C<interface>
1214 =item B<Interface> I<Interface>
1216 Select this interface. By default these interfaces will then be collected. For
1217 a more detailed description see B<IgnoreSelected> below.
1219 =item B<IgnoreSelected> I<true>|I<false>
1221 If no configuration if given, the B<traffic>-plugin will collect data from
1222 all interfaces. This may not be practical, especially for loopback- and
1223 similar interfaces. Thus, you can use the B<Interface>-option to pick the
1224 interfaces you're interested in. Sometimes, however, it's easier/preferred
1225 to collect all interfaces I<except> a few ones. This option enables you to
1226 do that: By setting B<IgnoreSelected> to I<true> the effect of
1227 B<Interface> is inverted: All selected interfaces are ignored and all
1228 other interfaces are collected.
1232 =head2 Plugin C<ipmi>
1236 =item B<Sensor> I<Sensor>
1238 Selects sensors to collect or to ignore, depending on B<IgnoreSelected>.
1240 =item B<IgnoreSelected> I<true>|I<false>
1242 If no configuration if given, the B<ipmi> plugin will collect data from all
1243 sensors found of type "temperature", "voltage", "current" and "fanspeed".
1244 This option enables you to do that: By setting B<IgnoreSelected> to I<true>
1245 the effect of B<Sensor> is inverted: All selected sensors are ignored and
1246 all other sensors are collected.
1248 =item B<NotifySensorAdd> I<true>|I<false>
1250 If a sensor appears after initialization time of a minute a notification
1253 =item B<NotifySensorRemove> I<true>|I<false>
1255 If a sensor disappears a notification is sent.
1257 =item B<NotifySensorNotPresent> I<true>|I<false>
1259 If you have for example dual power supply and one of them is (un)plugged then
1260 a notification is sent.
1264 =head2 Plugin C<iptables>
1268 =item B<Chain> I<Table> I<Chain> [I<Comment|Number> [I<Name>]]
1270 Select the rules to count. If only I<Table> and I<Chain> are given, this plugin
1271 will collect the counters of all rules which have a comment-match. The comment
1272 is then used as type-instance.
1274 If I<Comment> or I<Number> is given, only the rule with the matching comment or
1275 the I<n>th rule will be collected. Again, the comment (or the number) will be
1276 used as the type-instance.
1278 If I<Name> is supplied, it will be used as the type-instance instead of the
1279 comment or the number.
1283 =head2 Plugin C<irq>
1289 Select this irq. By default these irqs will then be collected. For a more
1290 detailed description see B<IgnoreSelected> below.
1292 =item B<IgnoreSelected> I<true>|I<false>
1294 If no configuration if given, the B<irq>-plugin will collect data from all
1295 irqs. This may not be practical, especially if no interrupts happen. Thus, you
1296 can use the B<Irq>-option to pick the interrupt you're interested in.
1297 Sometimes, however, it's easier/preferred to collect all interrupts I<except> a
1298 few ones. This option enables you to do that: By setting B<IgnoreSelected> to
1299 I<true> the effect of B<Irq> is inverted: All selected interrupts are ignored
1300 and all other interrupts are collected.
1304 =head2 Plugin C<java>
1306 The I<Java> plugin makes it possible to write extensions for collectd in Java.
1307 This section only discusses the syntax and semantic of the configuration
1308 options. For more in-depth information on the I<Java> plugin, please read
1309 L<collectd-java(5)>.
1314 JVMArg "-verbose:jni"
1315 JVMArg "-Djava.class.path=/opt/collectd/lib/collectd/bindings/java"
1316 LoadPlugin "org.collectd.java.Foobar"
1317 <Plugin "org.collectd.java.Foobar">
1318 # To be parsed by the plugin
1322 Available configuration options:
1326 =item B<JVMArg> I<Argument>
1328 Argument that is to be passed to the I<Java Virtual Machine> (JVM). This works
1329 exactly the way the arguments to the I<java> binary on the command line work.
1330 Execute C<javaE<nbsp>--help> for details.
1332 Please note that B<all> these options must appear B<before> (i.E<nbsp>e. above)
1333 any other options! When another option is found, the JVM will be started and
1334 later options will have to be ignored!
1336 =item B<LoadPlugin> I<JavaClass>
1338 Instantiates a new I<JavaClass> object. The constructor of this object very
1339 likely then registers one or more callback methods with the server.
1341 See L<collectd-java(5)> for details.
1343 When the first such option is found, the virtual machine (JVM) is created. This
1344 means that all B<JVMArg> options must appear before (i.E<nbsp>e. above) all
1345 B<LoadPlugin> options!
1347 =item B<Plugin> I<Name>
1349 The entire block is passed to the Java plugin as an
1350 I<org.collectd.api.OConfigItem> object.
1352 For this to work, the plugin has to register a configuration callback first,
1353 see L<collectd-java(5)/"config callback">. This means, that the B<Plugin> block
1354 must appear after the appropriate B<LoadPlugin> block. Also note, that I<Name>
1355 depends on the (Java) plugin registering the callback and is completely
1356 independent from the I<JavaClass> argument passed to B<LoadPlugin>.
1360 =head2 Plugin C<libvirt>
1362 This plugin allows CPU, disk and network load to be collected for virtualized
1363 guests on the machine. This means that these characteristics can be collected
1364 for guest systems without installing any software on them - collectd only runs
1365 on the hosting system. The statistics are collected through libvirt
1366 (L<http://libvirt.org/>).
1368 Only I<Connection> is required.
1372 =item B<Connection> I<uri>
1374 Connect to the hypervisor given by I<uri>. For example if using Xen use:
1376 Connection "xen:///"
1378 Details which URIs allowed are given at L<http://libvirt.org/uri.html>.
1380 =item B<RefreshInterval> I<seconds>
1382 Refresh the list of domains and devices every I<seconds>. The default is 60
1383 seconds. Setting this to be the same or smaller than the I<Interval> will cause
1384 the list of domains and devices to be refreshed on every iteration.
1386 Refreshing the devices in particular is quite a costly operation, so if your
1387 virtualization setup is static you might consider increasing this. If this
1388 option is set to 0, refreshing is disabled completely.
1390 =item B<Domain> I<name>
1392 =item B<BlockDevice> I<name:dev>
1394 =item B<InterfaceDevice> I<name:dev>
1396 =item B<IgnoreSelected> I<true>|I<false>
1398 Select which domains and devices are collected.
1400 If I<IgnoreSelected> is not given or I<false> then only the listed domains and
1401 disk/network devices are collected.
1403 If I<IgnoreSelected> is I<true> then the test is reversed and the listed
1404 domains and disk/network devices are ignored, while the rest are collected.
1406 The domain name and device names may use a regular expression, if the name is
1407 surrounded by I</.../> and collectd was compiled with support for regexps.
1409 The default is to collect statistics for all domains and all their devices.
1413 BlockDevice "/:hdb/"
1414 IgnoreSelected "true"
1416 Ignore all I<hdb> devices on any domain, but other block devices (eg. I<hda>)
1419 =item B<HostnameFormat> B<name|uuid|hostname|...>
1421 When the libvirt plugin logs data, it sets the hostname of the collected data
1422 according to this setting. The default is to use the guest name as provided by
1423 the hypervisor, which is equal to setting B<name>.
1425 B<uuid> means use the guest's UUID. This is useful if you want to track the
1426 same guest across migrations.
1428 B<hostname> means to use the global B<Hostname> setting, which is probably not
1429 useful on its own because all guests will appear to have the same name.
1431 You can also specify combinations of these fields. For example B<name uuid>
1432 means to concatenate the guest name and UUID (with a literal colon character
1433 between, thus I<"foo:1234-1234-1234-1234">).
1437 =head2 Plugin C<logfile>
1441 =item B<LogLevel> B<debug|info|notice|warning|err>
1443 Sets the log-level. If, for example, set to B<notice>, then all events with
1444 severity B<notice>, B<warning>, or B<err> will be written to the logfile.
1446 Please note that B<debug> is only available if collectd has been compiled with
1449 =item B<File> I<File>
1451 Sets the file to write log messages to. The special strings B<stdout> and
1452 B<stderr> can be used to write to the standard output and standard error
1453 channels, respectively. This, of course, only makes much sense when collectd is
1454 running in foreground- or non-daemon-mode.
1456 =item B<Timestamp> B<true>|B<false>
1458 Prefix all lines printed by the current time. Defaults to B<true>.
1462 B<Note>: There is no need to notify the daemon after moving or removing the
1463 log file (e.E<nbsp>g. when rotating the logs). The plugin reopens the file
1464 for each line it writes.
1466 =head2 Plugin C<mbmon>
1468 The C<mbmon plugin> uses mbmon to retrieve temperature, voltage, etc.
1470 Be default collectd connects to B<localhost> (127.0.0.1), port B<411/tcp>. The
1471 B<Host> and B<Port> options can be used to change these values, see below.
1472 C<mbmon> has to be running to work correctly. If C<mbmon> is not running
1473 timeouts may appear which may interfere with other statistics..
1475 C<mbmon> must be run with the -r option ("print TAG and Value format");
1476 Debian's F</etc/init.d/mbmon> script already does this, other people
1477 will need to ensure that this is the case.
1481 =item B<Host> I<Hostname>
1483 Hostname to connect to. Defaults to B<127.0.0.1>.
1485 =item B<Port> I<Port>
1487 TCP-Port to connect to. Defaults to B<411>.
1491 =head2 Plugin C<memcachec>
1493 The C<memcachec plugin> connects to a memcached server, queries one or more
1494 given I<pages> and parses the returned data according to user specification.
1495 The I<matches> used are the same as the matches used in the C<curl> and C<tail>
1498 In order to talk to the memcached server, this plugin uses the I<libmemcached>
1499 library. Please note that there is another library with a very similar name,
1500 libmemcache (notice the missing `d'), which is not applicable.
1502 Synopsis of the configuration:
1504 <Plugin "memcachec">
1505 <Page "plugin_instance">
1509 Regex "(\\d+) bytes sent"
1512 Instance "type_instance"
1517 The configuration options are:
1521 =item E<lt>B<Page> I<Name>E<gt>
1523 Each B<Page> block defines one I<page> to be queried from the memcached server.
1524 The block requires one string argument which is used as I<plugin instance>.
1526 =item B<Server> I<Address>
1528 Sets the server address to connect to when querying the page. Must be inside a
1533 When connected to the memcached server, asks for the page I<Key>.
1535 =item E<lt>B<Match>E<gt>
1537 Match blocks define which strings to look for and how matches substrings are
1538 interpreted. For a description of match blocks, please see L<"Plugin tail">.
1542 =head2 Plugin C<memcached>
1544 The C<memcached plugin> connects to a memcached server and queries statistics
1545 about cache utilization, memory and bandwidth used.
1546 L<http://www.danga.com/memcached/>
1550 =item B<Host> I<Hostname>
1552 Hostname to connect to. Defaults to B<127.0.0.1>.
1554 =item B<Port> I<Port>
1556 TCP-Port to connect to. Defaults to B<11211>.
1560 =head2 Plugin C<mysql>
1562 The C<mysql plugin> requires B<mysqlclient> to be installed. It connects to
1563 one or more databases when started and keeps the connection up as long as
1564 possible. When the connection is interrupted for whatever reason it will try
1565 to re-connect. The plugin will complaint loudly in case anything goes wrong.
1567 This plugin issues the MySQL C<SHOW STATUS> / C<SHOW GLOBAL STATUS> command
1568 and collects information about MySQL network traffic, executed statements,
1569 requests, the query cache and threads by evaluating the
1570 C<Bytes_{received,sent}>, C<Com_*>, C<Handler_*>, C<Qcache_*> and C<Threads_*>
1571 return values. Please refer to the B<MySQL reference manual>, I<5.1.6. Server
1572 Status Variables> for an explanation of these values.
1574 Optionally, master and slave statistics may be collected in a MySQL
1575 replication setup. In that case, information about the synchronization state
1576 of the nodes are collected by evaluating the C<Position> return value of the
1577 C<SHOW MASTER STATUS> command and the C<Seconds_Behind_Master>,
1578 C<Read_Master_Log_Pos> and C<Exec_Master_Log_Pos> return values of the
1579 C<SHOW SLAVE STATUS> command. See the B<MySQL reference manual>,
1580 I<12.5.5.21 SHOW MASTER STATUS Syntax> and
1581 I<12.5.5.31 SHOW SLAVE STATUS Syntax> for details.
1596 Socket "/var/run/mysql/mysqld.sock"
1598 SlaveNotifications true
1602 A B<Database> block defines one connection to a MySQL database. It accepts a
1603 single argument which specifies the name of the database. None of the other
1604 options are required. MySQL will use default values as documented in the
1605 section "mysql_real_connect()" in the B<MySQL reference manual>.
1609 =item B<Host> I<Hostname>
1611 Hostname of the database server. Defaults to B<localhost>.
1613 =item B<User> I<Username>
1615 Username to use when connecting to the database. The user does not have to be
1616 granted any privileges (which is synonym to granting the C<USAGE> privilege).
1617 Any existing MySQL user will do.
1619 =item B<Password> I<Password>
1621 Password needed to log into the database.
1623 =item B<Database> I<Database>
1625 Select this database. Defaults to I<no database> which is a perfectly reasonable
1626 option for what this plugin does.
1628 =item B<Port> I<Port>
1630 TCP-port to connect to. The port must be specified in its numeric form, but it
1631 must be passed as a string nonetheless. For example:
1635 If B<Host> is set to B<localhost> (the default), this setting has no effect.
1636 See the documentation for the C<mysql_real_connect> function for details.
1638 =item B<Socket> I<Socket>
1640 Specifies the path to the UNIX domain socket of the MySQL server. This option
1641 only has any effect, if B<Host> is set to B<localhost> (the default).
1642 Otherwise, use the B<Port> option above. See the documentation for the
1643 C<mysql_real_connect> function for details.
1645 =item B<MasterStats> I<true|false>
1647 =item B<SlaveStats> I<true|false>
1649 Enable the collection of master / slave statistics in a replication setup.
1651 =item B<SlaveNotifications> I<true|false>
1653 If enabled, the plugin sends a notification if the replication slave I/O and /
1654 or SQL threads are not running.
1658 =head2 Plugin C<netlink>
1660 The C<netlink> plugin uses a netlink socket to query the Linux kernel about
1661 statistics of various interface and routing aspects.
1665 =item B<Interface> I<Interface>
1667 =item B<VerboseInterface> I<Interface>
1669 Instruct the plugin to collect interface statistics. This is basically the same
1670 as the statistics provided by the C<interface> plugin (see above) but
1671 potentially much more detailed.
1673 When configuring with B<Interface> only the basic statistics will be collected,
1674 namely octets, packets, and errors. These statistics are collected by
1675 the C<interface> plugin, too, so using both at the same time is no benefit.
1677 When configured with B<VerboseInterface> all counters B<except> the basic ones,
1678 so that no data needs to be collected twice if you use the C<interface> plugin.
1679 This includes dropped packets, received multicast packets, collisions and a
1680 whole zoo of differentiated RX and TX errors. You can try the following command
1681 to get an idea of what awaits you:
1685 If I<Interface> is B<All>, all interfaces will be selected.
1687 =item B<QDisc> I<Interface> [I<QDisc>]
1689 =item B<Class> I<Interface> [I<Class>]
1691 =item B<Filter> I<Interface> [I<Filter>]
1693 Collect the octets and packets that pass a certain qdisc, class or filter.
1695 QDiscs and classes are identified by their type and handle (or classid).
1696 Filters don't necessarily have a handle, therefore the parent's handle is used.
1697 The notation used in collectd differs from that used in tc(1) in that it
1698 doesn't skip the major or minor number if it's zero and doesn't print special
1699 ids by their name. So, for example, a qdisc may be identified by
1700 C<pfifo_fast-1:0> even though the minor number of B<all> qdiscs is zero and
1701 thus not displayed by tc(1).
1703 If B<QDisc>, B<Class>, or B<Filter> is given without the second argument,
1704 i.E<nbsp>.e. without an identifier, all qdiscs, classes, or filters that are
1705 associated with that interface will be collected.
1707 Since a filter itself doesn't necessarily have a handle, the parent's handle is
1708 used. This may lead to problems when more than one filter is attached to a
1709 qdisc or class. This isn't nice, but we don't know how this could be done any
1710 better. If you have a idea, please don't hesitate to tell us.
1712 As with the B<Interface> option you can specify B<All> as the interface,
1713 meaning all interfaces.
1715 Here are some examples to help you understand the above text more easily:
1718 VerboseInterface "All"
1719 QDisc "eth0" "pfifo_fast-1:0"
1721 Class "ppp0" "htb-1:10"
1722 Filter "ppp0" "u32-1:0"
1725 =item B<IgnoreSelected>
1727 The behaviour is the same as with all other similar plugins: If nothing is
1728 selected at all, everything is collected. If some things are selected using the
1729 options described above, only these statistics are collected. If you set
1730 B<IgnoreSelected> to B<true>, this behavior is inverted, i.E<nbsp>e. the
1731 specified statistics will not be collected.
1735 =head2 Plugin C<network>
1737 The Network plugin sends data to a remote instance of collectd, receives data
1738 from a remote instance, or both at the same time. Data which has been received
1739 from the network is usually not transmitted again, but this can be actived, see
1740 the B<Forward> option below.
1742 The default IPv6 multicast group is C<ff18::efc0:4a42>. The default IPv4
1743 multicast group is C<239.192.74.66>. The default I<UDP> port is B<25826>.
1745 Both, B<Server> and B<Listen> can be used as single option or as block. When
1746 used as block, given options are valid for this socket only. For example:
1749 Server "collectd.internal.tld"
1750 <Server "collectd.external.tld">
1751 SecurityLevel "sign"
1752 Username "myhostname"
1759 =item B<E<lt>Server> I<Host> [I<Port>]B<E<gt>>
1761 The B<Server> statement/block sets the server to send datagrams to. The
1762 statement may occur multiple times to send each datagram to multiple
1765 The argument I<Host> may be a hostname, an IPv4 address or an IPv6 address. The
1766 optional second argument specifies a port number or a service name. If not
1767 given, the default, B<25826>, is used.
1769 The following options are recognized within B<Server> blocks:
1773 =item B<SecurityLevel> B<Encrypt>|B<Sign>|B<None>
1775 Set the security you require for network communication. When the security level
1776 has been set to B<Encrypt>, data sent over the network will be encrypted using
1777 I<AES-256>. The integrity of encrypted packets is ensured using I<SHA-1>. When
1778 set to B<Sign>, transmitted data is signed using the I<HMAC-SHA-256> message
1779 authentication code. When set to B<None>, data is sent without any security.
1781 This feature is only available if the I<network> plugin was linked with
1784 =item B<Username> I<Username>
1786 Sets the username to transmit. This is used by the server to lookup the
1787 password. See B<AuthFile> below. All security levels except B<None> require
1790 This feature is only available if the I<network> plugin was linked with
1793 =item B<Password> I<Password>
1795 Sets a password (shared secret) for this socket. All security levels except
1796 B<None> require this setting.
1798 This feature is only available if the I<network> plugin was linked with
1803 =item B<E<lt>Listen> I<Host> [I<Port>]B<E<gt>>
1805 The B<Listen> statement sets the interfaces to bind to. When multiple
1806 statements are found the daemon will bind to multiple interfaces.
1808 The argument I<Host> may be a hostname, an IPv4 address or an IPv6 address. If
1809 the argument is a multicast address the daemon will join that multicast group.
1810 The optional second argument specifies a port number or a service name. If not
1811 given, the default, B<25826>, is used.
1813 The following options are recognized within C<E<lt>ListenE<gt>> blocks:
1817 =item B<SecurityLevel> B<Encrypt>|B<Sign>|B<None>
1819 Set the security you require for network communication. When the security level
1820 has been set to B<Encrypt>, only encrypted data will be accepted. The integrity
1821 of encrypted packets is ensured using I<SHA-1>. When set to B<Sign>, only
1822 signed and encrypted data is accepted. When set to B<None>, all data will be
1823 accepted. If an B<AuthFile> option was given (see below), encrypted data is
1824 decrypted if possible.
1826 This feature is only available if the I<network> plugin was linked with
1829 =item B<AuthFile> I<Filename>
1831 Sets a file in which usernames are mapped to passwords. These passwords are
1832 used to verify signatures and to decrypt encrypted network packets. If
1833 B<SecurityLevel> is set to B<None>, this is optional. If given, signed data is
1834 verified and encrypted packets are decrypted. Otherwise, signed data is
1835 accepted without checking the signature and encrypted data cannot be decrypted.
1836 For the other security levels this option is mandatory.
1838 The file format is very simple: Each line consists of a username followed by a
1839 colon and any number of spaces followed by the password. To demonstrate, an
1840 example file could look like this:
1845 Each time a packet is received, the modification time of the file is checked
1846 using L<stat(2)>. If the file has been changed, the contents is re-read. While
1847 the file is being read, it is locked using L<fcntl(2)>.
1851 =item B<TimeToLive> I<1-255>
1853 Set the time-to-live of sent packets. This applies to all, unicast and
1854 multicast, and IPv4 and IPv6 packets. The default is to not change this value.
1855 That means that multicast packets will be sent with a TTL of C<1> (one) on most
1858 =item B<MaxPacketSize> I<1024-65535>
1860 Set the maximum size for datagrams received over the network. Packets larger
1861 than this will be truncated.
1863 =item B<Forward> I<true|false>
1865 If set to I<true>, write packets that were received via the network plugin to
1866 the sending sockets. This should only be activated when the B<Listen>- and
1867 B<Server>-statements differ. Otherwise packets may be send multiple times to
1868 the same multicast group. While this results in more network traffic than
1869 necessary it's not a huge problem since the plugin has a duplicate detection,
1870 so the values will not loop.
1872 =item B<CacheFlush> I<Seconds>
1874 For each host/plugin/type combination the C<network plugin> caches the time of
1875 the last value being sent or received. Every I<Seconds> seconds the plugin
1876 searches and removes all entries that are older than I<Seconds> seconds, thus
1877 freeing the unused memory again. Since this process is somewhat expensive and
1878 normally doesn't do much, this value should not be too small. The default is
1879 1800 seconds, but setting this to 86400 seconds (one day) will not do much harm
1884 =head2 Plugin C<nginx>
1886 This plugin collects the number of connections and requests handled by the
1887 C<nginx daemon> (speak: engineE<nbsp>X), a HTTP and mail server/proxy. It
1888 queries the page provided by the C<ngx_http_stub_status_module> module, which
1889 isn't compiled by default. Please refer to
1890 L<http://wiki.codemongers.com/NginxStubStatusModule> for more information on
1891 how to compile and configure nginx and this module.
1893 The following options are accepted by the C<nginx plugin>:
1897 =item B<URL> I<http://host/nginx_status>
1899 Sets the URL of the C<ngx_http_stub_status_module> output.
1901 =item B<User> I<Username>
1903 Optional user name needed for authentication.
1905 =item B<Password> I<Password>
1907 Optional password needed for authentication.
1909 =item B<VerifyPeer> B<true|false>
1911 Enable or disable peer SSL certificate verification. See
1912 L<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by default.
1914 =item B<VerifyHost> B<true|false>
1916 Enable or disable peer host name verification. If enabled, the plugin checks
1917 if the C<Common Name> or a C<Subject Alternate Name> field of the SSL
1918 certificate matches the host name provided by the B<URL> option. If this
1919 identity check fails, the connection is aborted. Obviously, only works when
1920 connecting to a SSL enabled server. Enabled by default.
1922 =item B<CACert> I<File>
1924 File that holds one or more SSL certificates. If you want to use HTTPS you will
1925 possibly need this option. What CA certificates come bundled with C<libcurl>
1926 and are checked by default depends on the distribution you use.
1930 =head2 Plugin C<notify_desktop>
1932 This plugin sends a desktop notification to a notification daemon, as defined
1933 in the Desktop Notification Specification. To actually display the
1934 notifications, B<notification-daemon> is required and B<collectd> has to be
1935 able to access the X server.
1937 The Desktop Notification Specification can be found at
1938 L<http://www.galago-project.org/specs/notification/>.
1942 =item B<OkayTimeout> I<timeout>
1944 =item B<WarningTimeout> I<timeout>
1946 =item B<FailureTimeout> I<timeout>
1948 Set the I<timeout>, in milliseconds, after which to expire the notification
1949 for C<OKAY>, C<WARNING> and C<FAILURE> severities respectively. If zero has
1950 been specified, the displayed notification will not be closed at all - the
1951 user has to do so herself. These options default to 5000. If a negative number
1952 has been specified, the default is used as well.
1956 =head2 Plugin C<notify_email>
1958 The I<notify_email> plugin uses the I<ESMTP> library to send notifications to a
1959 configured email address.
1961 I<libESMTP> is available from L<http://www.stafford.uklinux.net/libesmtp/>.
1963 Available configuration options:
1967 =item B<From> I<Address>
1969 Email address from which the emails should appear to come from.
1971 Default: C<root@localhost>
1973 =item B<Recipient> I<Address>
1975 Configures the email address(es) to which the notifications should be mailed.
1976 May be repeated to send notifications to multiple addresses.
1978 At least one B<Recipient> must be present for the plugin to work correctly.
1980 =item B<SMTPServer> I<Hostname>
1982 Hostname of the SMTP server to connect to.
1984 Default: C<localhost>
1986 =item B<SMTPPort> I<Port>
1988 TCP port to connect to.
1992 =item B<SMTPUser> I<Username>
1994 Username for ASMTP authentication. Optional.
1996 =item B<SMTPPassword> I<Password>
1998 Password for ASMTP authentication. Optional.
2000 =item B<Subject> I<Subject>
2002 Subject-template to use when sending emails. There must be exactly two
2003 string-placeholders in the subject, given in the standard I<printf(3)> syntax,
2004 i.E<nbsp>e. C<%s>. The first will be replaced with the severity, the second
2007 Default: C<Collectd notify: %s@%s>
2011 =head2 Plugin C<ntpd>
2015 =item B<Host> I<Hostname>
2017 Hostname of the host running B<ntpd>. Defaults to B<localhost>.
2019 =item B<Port> I<Port>
2021 UDP-Port to connect to. Defaults to B<123>.
2023 =item B<ReverseLookups> B<true>|B<false>
2025 Sets wether or not to perform reverse lookups on peers. Since the name or
2026 IP-address may be used in a filename it is recommended to disable reverse
2027 lookups. The default is to do reverse lookups to preserve backwards
2028 compatibility, though.
2032 =head2 Plugin C<nut>
2036 =item B<UPS> I<upsname>B<@>I<hostname>[B<:>I<port>]
2038 Add a UPS to collect data from. The format is identical to the one accepted by
2043 =head2 Plugin C<olsrd>
2045 The I<olsrd> plugin connects to the TCP port opened by the I<txtinfo> plugin of
2046 the Optimized Link State Routing daemon and reads information about the current
2047 state of the meshed network.
2049 The following configuration options are understood:
2053 =item B<Host> I<Host>
2055 Connect to I<Host>. Defaults to B<"localhost">.
2057 =item B<Port> I<Port>
2059 Specifies the port to connect to. This must be a string, even if you give the
2060 port as a number rather than a service name. Defaults to B<"2006">.
2062 =item B<CollectLinks> B<No>|B<Summary>|B<Detail>
2064 Specifies what information to collect about links, i.E<nbsp>e. direct
2065 connections of the daemon queried. If set to B<No>, no information is
2066 collected. If set to B<Summary>, the number of links and the average of all
2067 I<link quality> (LQ) and I<neighbor link quality> (NLQ) values is calculated.
2068 If set to B<Detail> LQ and NLQ are collected per link.
2070 Defaults to B<Detail>.
2072 =item B<CollectRoutes> B<No>|B<Summary>|B<Detail>
2074 Specifies what information to collect about routes of the daemon queried. If
2075 set to B<No>, no information is collected. If set to B<Summary>, the number of
2076 routes and the average I<metric> and I<ETX> is calculated. If set to B<Detail>
2077 metric and ETX are collected per route.
2079 Defaults to B<Summary>.
2081 =item B<CollectTopology> B<No>|B<Summary>|B<Detail>
2083 Specifies what information to collect about the global topology. If set to
2084 B<No>, no information is collected. If set to B<Summary>, the number of links
2085 in the entire topology and the average I<link quality> (LQ) is calculated.
2086 If set to B<Detail> LQ and NLQ are collected for each link in the entire topology.
2088 Defaults to B<Summary>.
2092 =head2 Plugin C<onewire>
2094 B<EXPERIMENTAL!> See notes below.
2096 The C<onewire> plugin uses the B<owcapi> library from the B<owfs> project
2097 L<http://owfs.org/> to read sensors connected via the onewire bus.
2099 Currently only temperature sensors (sensors with the family code C<10>,
2100 e.E<nbsp>g. DS1820, DS18S20, DS1920) can be read. If you have other sensors you
2101 would like to have included, please send a sort request to the mailing list.
2103 Hubs (the DS2409 chips) are working, but read the note, why this plugin is
2104 experimental, below.
2108 =item B<Device> I<Device>
2110 Sets the device to read the values from. This can either be a "real" hardware
2111 device, such as a serial port or an USB port, or the address of the
2112 L<owserver(1)> socket, usually B<localhost:4304>.
2114 Though the documentation claims to automatically recognize the given address
2115 format, with versionE<nbsp>2.7p4 we had to specify the type explicitly. So
2116 with that version, the following configuration worked for us:
2119 Device "-s localhost:4304"
2122 This directive is B<required> and does not have a default value.
2124 =item B<Sensor> I<Sensor>
2126 Selects sensors to collect or to ignore, depending on B<IgnoreSelected>, see
2127 below. Sensors are specified without the family byte at the beginning, to you'd
2128 use C<F10FCA000800>, and B<not> include the leading C<10.> family byte and
2131 =item B<IgnoreSelected> I<true>|I<false>
2133 If no configuration if given, the B<onewire> plugin will collect data from all
2134 sensors found. This may not be practical, especially if sensors are added and
2135 removed regularly. Sometimes, however, it's easier/preferred to collect only
2136 specific sensors or all sensors I<except> a few specified ones. This option
2137 enables you to do that: By setting B<IgnoreSelected> to I<true> the effect of
2138 B<Sensor> is inverted: All selected interfaces are ignored and all other
2139 interfaces are collected.
2141 =item B<Interval> I<Seconds>
2143 Sets the interval in which all sensors should be read. If not specified, the
2144 global B<Interval> setting is used.
2148 B<EXPERIMENTAL!> The C<onewire> plugin is experimental, because it doesn't yet
2149 work with big setups. It works with one sensor being attached to one
2150 controller, but as soon as you throw in a couple more senors and maybe a hub
2151 or two, reading all values will take more than ten seconds (the default
2152 interval). We will probably add some separate thread for reading the sensors
2153 and some cache or something like that, but it's not done yet. We will try to
2154 maintain backwards compatibility in the future, but we can't promise. So in
2155 short: If it works for you: Great! But keep in mind that the config I<might>
2156 change, though this is unlikely. Oh, and if you want to help improving this
2157 plugin, just send a short notice to the mailing list. ThanksE<nbsp>:)
2159 =head2 Plugin C<openvpn>
2161 The OpenVPN plugin reads a status file maintained by OpenVPN and gathers
2162 traffic statistics about connected clients.
2164 To set up OpenVPN to write to the status file periodically, use the
2165 B<--status> option of OpenVPN. Since OpenVPN can write two different formats,
2166 you need to set the required format, too. This is done by setting
2167 B<--status-version> to B<2>.
2169 So, in a nutshell you need:
2171 openvpn $OTHER_OPTIONS \
2172 --status "/var/run/openvpn-status" 10 \
2179 =item B<StatusFile> I<File>
2181 Specifies the location of the status file.
2185 =head2 Plugin C<oracle>
2187 The "oracle" plugin uses the Oracle® Call Interface I<(OCI)> to connect to an
2188 Oracle® Database and lets you execute SQL statements there. It is very similar
2189 to the "dbi" plugin, because it was written around the same time. See the "dbi"
2190 plugin's documentation above for details.
2193 <Query "out_of_stock">
2194 Statement "SELECT category, COUNT(*) AS value FROM products WHERE in_stock = 0 GROUP BY category"
2197 # InstancePrefix "foo"
2198 InstancesFrom "category"
2202 <Database "product_information">
2206 Query "out_of_stock"
2210 =head3 B<Query> blocks
2212 The Query blocks are handled identically to the Query blocks of the "dbi"
2213 plugin. Please see its documentation above for details on how to specify
2216 =head3 B<Database> blocks
2218 Database blocks define a connection to a database and which queries should be
2219 sent to that database. Each database needs a "name" as string argument in the
2220 starting tag of the block. This name will be used as "PluginInstance" in the
2221 values submitted to the daemon. Other than that, that name is not used.
2225 =item B<ConnectID> I<ID>
2227 Defines the "database alias" or "service name" to connect to. Usually, these
2228 names are defined in the file named C<$ORACLE_HOME/network/admin/tnsnames.ora>.
2230 =item B<Username> I<Username>
2232 Username used for authentication.
2234 =item B<Password> I<Password>
2236 Password used for authentication.
2238 =item B<Query> I<QueryName>
2240 Associates the query named I<QueryName> with this database connection. The
2241 query needs to be defined I<before> this statement, i.E<nbsp>e. all query
2242 blocks you want to refer to must be placed above the database block you want to
2247 =head2 Plugin C<perl>
2249 This plugin embeds a Perl-interpreter into collectd and provides an interface
2250 to collectd's plugin system. See L<collectd-perl(5)> for its documentation.
2252 =head2 Plugin C<ping>
2254 The I<Ping> plugin starts a new thread which sends ICMP "ping" packets to the
2255 configured hosts periodically and measures the network latency. Whenever the
2256 C<read> function of the plugin is called, it submits the average latency, the
2257 standard deviation and the drop rate for each host.
2259 Available configuration options:
2263 =item B<Host> I<IP-address>
2265 Host to ping periodically. This option may be repeated several times to ping
2268 =item B<Interval> I<Seconds>
2270 Sets the interval in which to send ICMP echo packets to the configured hosts.
2271 This is B<not> the interval in which statistics are queries from the plugin but
2272 the interval in which the hosts are "pinged". Therefore, the setting here
2273 should be smaller than or equal to the global B<Interval> setting. Fractional
2274 times, such as "1.24" are allowed.
2278 =item B<Timeout> I<Seconds>
2280 Time to wait for a response from the host to which an ICMP packet had been
2281 sent. If a reply was not received after I<Seconds> seconds, the host is assumed
2282 to be down or the packet to be dropped. This setting must be smaller than the
2283 B<Interval> setting above for the plugin to work correctly. Fractional
2284 arguments are accepted.
2288 =item B<TTL> I<0-255>
2290 Sets the Time-To-Live of generated ICMP packets.
2294 =head2 Plugin C<postgresql>
2296 The C<postgresql> plugin queries statistics from PostgreSQL databases. It
2297 keeps a persistent connection to all configured databases and tries to
2298 reconnect if the connection has been interrupted. A database is configured by
2299 specifying a B<Database> block as described below. The default statistics are
2300 collected from PostgreSQL's B<statistics collector> which thus has to be
2301 enabled for this plugin to work correctly. This should usually be the case by
2302 default. See the section "The Statistics Collector" of the B<PostgreSQL
2303 Documentation> for details.
2305 By specifying custom database queries using a B<Query> block as described
2306 below, you may collect any data that is available from some PostgreSQL
2307 database. This way, you are able to access statistics of external daemons
2308 which are available in a PostgreSQL database or use future or special
2309 statistics provided by PostgreSQL without the need to upgrade your collectd
2312 The B<PostgreSQL Documentation> manual can be found at
2313 L<http://www.postgresql.org/docs/manuals/>.
2317 Statement "SELECT magic FROM wizard WHERE host = $1;"
2321 InstancePrefix "magic"
2326 <Query rt36_tickets>
2327 Statement "SELECT COUNT(type) AS count, type \
2329 WHEN resolved = 'epoch' THEN 'open' \
2330 ELSE 'resolved' END AS type \
2331 FROM tickets) type \
2335 InstancePrefix "rt36_tickets"
2336 InstancesFrom "type"
2347 KRBSrvName "kerberos_service_name"
2352 Service "service_name"
2353 Query backend # predefined
2358 The B<Query> block defines one database query which may later be used by a
2359 database definition. It accepts a single mandatory argument which specifies
2360 the name of the query. The names of all queries have to be unique (see the
2361 B<MinVersion> and B<MaxVersion> options below for an exception to this
2362 rule). The following configuration options are available to define the query:
2364 In each B<Query> block, there is one or more B<Result> blocks. B<Result>
2365 blocks define how to handle the values returned from the query. They define
2366 which column holds which value and how to dispatch that value to the daemon.
2367 Multiple B<Result> blocks may be used to extract multiple values from a single
2372 =item B<Statement> I<sql query statement>
2374 Specify the I<sql query statement> which the plugin should execute. The string
2375 may contain the tokens B<$1>, B<$2>, etc. which are used to reference the
2376 first, second, etc. parameter. The value of the parameters is specified by the
2377 B<Param> configuration option - see below for details. To include a literal
2378 B<$> character followed by a number, surround it with single quotes (B<'>).
2380 Any SQL command which may return data (such as C<SELECT> or C<SHOW>) is
2381 allowed. Note, however, that only a single command may be used. Semicolons are
2382 allowed as long as a single non-empty command has been specified only.
2384 The returned lines will be handled separately one after another.
2386 =item B<Query> I<sql query statement>
2388 This is a deprecated synonym for B<Statement>. It will be removed in version 5
2391 =item B<Param> I<hostname>|I<database>|I<username>|I<interval>
2393 Specify the parameters which should be passed to the SQL query. The parameters
2394 are referred to in the SQL query as B<$1>, B<$2>, etc. in the same order as
2395 they appear in the configuration file. The value of the parameter is
2396 determined depending on the value of the B<Param> option as follows:
2402 The configured hostname of the database connection. If a UNIX domain socket is
2403 used, the parameter expands to "localhost".
2407 The name of the database of the current connection.
2411 The username used to connect to the database.
2415 The interval collectd is using (as specified by the B<Interval> option).
2419 Please note that parameters are only supported by PostgreSQL's protocol
2420 version 3 and above which was introduced in version 7.4 of PostgreSQL.
2422 =item B<Type> I<type>
2424 The I<type> name to be used when dispatching the values. The type describes
2425 how to handle the data and where to store it. See L<types.db(5)> for more
2426 details on types and their configuration. The number and type of values (as
2427 selected by the B<ValuesFrom> option) has to match the type of the given name.
2429 This option is required inside a B<Result> block.
2431 =item B<InstancePrefix> I<prefix>
2433 =item B<InstancesFrom> I<column0> [I<column1> ...]
2435 Specify how to create the "TypeInstance" for each data set (i.E<nbsp>e. line).
2436 B<InstancePrefix> defines a static prefix that will be prepended to all type
2437 instances. B<InstancesFrom> defines the column names whose values will be used
2438 to create the type instance. Multiple values will be joined together using the
2439 hyphen (C<->) as separation character.
2441 The plugin itself does not check whether or not all built instances are
2442 different. It is your responsibility to assure that each is unique.
2444 Both options are optional. If none is specified, the type instance will be
2447 =item B<ValuesFrom> I<column0> [I<column1> ...]
2449 Names the columns whose content is used as the actual data for the data sets
2450 that are dispatched to the daemon. How many such columns you need is
2451 determined by the B<Type> setting as explained above. If you specify too many
2452 or not enough columns, the plugin will complain about that and no data will be
2453 submitted to the daemon.
2455 The actual data type, as seen by PostgreSQL, is not that important as long as
2456 it represents numbers. The plugin will automatically cast the values to the
2457 right type if it know how to do that. For that, it uses the L<strtoll(3)> and
2458 L<strtod(3)> functions, so anything supported by those functions is supported
2459 by the plugin as well.
2461 This option is required inside a B<Result> block and may be specified multiple
2462 times. If multiple B<ValuesFrom> options are specified, the columns are read
2465 =item B<Column> I<type> [I<type instance>]
2467 This is a deprecated alternative to a B<Result> block. It will be removed in
2468 version 5 of collectd. It is equivalent to the following B<Result> block:
2472 InstancePrefix I<type instance>
2473 ValuesFrom I<name of the x. column>
2476 The order of the B<Column> options defines which columns of the query result
2477 should be used. The first option specifies the data found in the first column,
2478 the second option that of the second column, and so on.
2480 =item B<MinVersion> I<version>
2482 =item B<MaxVersion> I<version>
2484 Specify the minimum or maximum version of PostgreSQL that this query should be
2485 used with. Some statistics might only be available with certain versions of
2486 PostgreSQL. This allows you to specify multiple queries with the same name but
2487 which apply to different versions, thus allowing you to use the same
2488 configuration in a heterogeneous environment.
2490 The I<version> has to be specified as the concatenation of the major, minor
2491 and patch-level versions, each represented as two-decimal-digit numbers. For
2492 example, version 8.2.3 will become 80203.
2494 =item B<MinPGVersion> I<version>
2496 =item B<MaxPGVersion> I<version>
2498 These are deprecated synonyms for B<MinVersion> and B<MaxVersion>
2499 respectively. They will be removed in version 5 of collectd.
2503 The following predefined queries are available (the definitions can be found
2504 in the F<postgresql_default.conf> file which, by default, is available at
2505 C<I<prefix>/share/collectd/>):
2511 This query collects the number of backends, i.E<nbsp>e. the number of
2514 =item B<transactions>
2516 This query collects the numbers of committed and rolled-back transactions of
2521 This query collects the numbers of various table modifications (i.E<nbsp>e.
2522 insertions, updates, deletions) of the user tables.
2524 =item B<query_plans>
2526 This query collects the numbers of various table scans and returned tuples of
2529 =item B<table_states>
2531 This query collects the numbers of live and dead rows in the user tables.
2535 This query collects disk block access counts for user tables.
2539 This query collects the on-disk size of the database in bytes.
2543 The B<Database> block defines one PostgreSQL database for which to collect
2544 statistics. It accepts a single mandatory argument which specifies the
2545 database name. None of the other options are required. PostgreSQL will use
2546 default values as documented in the section "CONNECTING TO A DATABASE" in the
2547 L<psql(1)> manpage. However, be aware that those defaults may be influenced by
2548 the user collectd is run as and special environment variables. See the manpage
2553 =item B<Host> I<hostname>
2555 Specify the hostname or IP of the PostgreSQL server to connect to. If the
2556 value begins with a slash, it is interpreted as the directory name in which to
2557 look for the UNIX domain socket.
2559 This option is also used to determine the hostname that is associated with a
2560 collected data set. If it has been omitted or either begins with with a slash
2561 or equals B<localhost> it will be replaced with the global hostname definition
2562 of collectd. Any other value will be passed literally to collectd when
2563 dispatching values. Also see the global B<Hostname> and B<FQDNLookup> options.
2565 =item B<Port> I<port>
2567 Specify the TCP port or the local UNIX domain socket file extension of the
2570 =item B<User> I<username>
2572 Specify the username to be used when connecting to the server.
2574 =item B<Password> I<password>
2576 Specify the password to be used when connecting to the server.
2578 =item B<SSLMode> I<disable>|I<allow>|I<prefer>|I<require>
2580 Specify whether to use an SSL connection when contacting the server. The
2581 following modes are supported:
2587 Do not use SSL at all.
2591 First, try to connect without using SSL. If that fails, try using SSL.
2593 =item I<prefer> (default)
2595 First, try to connect using SSL. If that fails, try without using SSL.
2603 =item B<KRBSrvName> I<kerberos_service_name>
2605 Specify the Kerberos service name to use when authenticating with Kerberos 5
2606 or GSSAPI. See the sections "Kerberos authentication" and "GSSAPI" of the
2607 B<PostgreSQL Documentation> for details.
2609 =item B<Service> I<service_name>
2611 Specify the PostgreSQL service name to use for additional parameters. That
2612 service has to be defined in F<pg_service.conf> and holds additional
2613 connection parameters. See the section "The Connection Service File" in the
2614 B<PostgreSQL Documentation> for details.
2616 =item B<Query> I<query>
2618 Specify a I<query> which should be executed for the database connection. This
2619 may be any of the predefined or user-defined queries. If no such option is
2620 given, it defaults to "backends", "transactions", "queries", "query_plans",
2621 "table_states", "disk_io" and "disk_usage". Else, the specified queries are
2626 =head2 Plugin C<powerdns>
2628 The C<powerdns> plugin queries statistics from an authoritative PowerDNS
2629 nameserver and/or a PowerDNS recursor. Since both offer a wide variety of
2630 values, many of which are probably meaningless to most users, but may be useful
2631 for some. So you may chose which values to collect, but if you don't, some
2632 reasonable defaults will be collected.
2635 <Server "server_name">
2637 Collect "udp-answers" "udp-queries"
2638 Socket "/var/run/pdns.controlsocket"
2640 <Recursor "recursor_name">
2642 Collect "cache-hits" "cache-misses"
2643 Socket "/var/run/pdns_recursor.controlsocket"
2645 LocalSocket "/opt/collectd/var/run/collectd-powerdns"
2650 =item B<Server> and B<Recursor> block
2652 The B<Server> block defines one authoritative server to query, the B<Recursor>
2653 does the same for an recursing server. The possible options in both blocks are
2654 the same, though. The argument defines a name for the serverE<nbsp>/ recursor
2659 =item B<Collect> I<Field>
2661 Using the B<Collect> statement you can select which values to collect. Here,
2662 you specify the name of the values as used by the PowerDNS servers, e.E<nbsp>g.
2663 C<dlg-only-drops>, C<answers10-100>.
2665 The method of getting the values differs for B<Server> and B<Recursor> blocks:
2666 When querying the server a C<SHOW *> command is issued in any case, because
2667 that's the only way of getting multiple values out of the server at once.
2668 collectd then picks out the values you have selected. When querying the
2669 recursor, a command is generated to query exactly these values. So if you
2670 specify invalid fields when querying the recursor, a syntax error may be
2671 returned by the daemon and collectd may not collect any values at all.
2673 If no B<Collect> statement is given, the following B<Server> values will be
2680 =item packetcache-hit
2682 =item packetcache-miss
2684 =item packetcache-size
2686 =item query-cache-hit
2688 =item query-cache-miss
2690 =item recursing-answers
2692 =item recursing-questions
2704 The following B<Recursor> values will be collected by default:
2708 =item noerror-answers
2710 =item nxdomain-answers
2712 =item servfail-answers
2730 Please note that up to that point collectd doesn't know what values are
2731 available on the server and values that are added do not need a change of the
2732 mechanism so far. However, the values must be mapped to collectd's naming
2733 scheme, which is done using a lookup table that lists all known values. If
2734 values are added in the future and collectd does not know about them, you will
2735 get an error much like this:
2737 powerdns plugin: submit: Not found in lookup table: foobar = 42
2739 In this case please file a bug report with the collectd team.
2741 =item B<Socket> I<Path>
2743 Configures the path to the UNIX domain socket to be used when connecting to the
2744 daemon. By default C<${localstatedir}/run/pdns.controlsocket> will be used for
2745 an authoritative server and C<${localstatedir}/run/pdns_recursor.controlsocket>
2746 will be used for the recursor.
2750 =item B<LocalSocket> I<Path>
2752 Querying the recursor is done using UDP. When using UDP over UNIX domain
2753 sockets, the client socket needs a name in the file system, too. You can set
2754 this local name to I<Path> using the B<LocalSocket> option. The default is
2755 C<I<prefix>/var/run/collectd-powerdns>.
2759 =head2 Plugin C<processes>
2763 =item B<Process> I<Name>
2765 Select more detailed statistics of processes matching this name. The statistics
2766 collected for these selected processes are size of the resident segment size
2767 (RSS), user- and system-time used, number of processes and number of threads,
2768 and minor and major pagefaults.
2770 =item B<ProcessMatch> I<name> I<regex>
2772 Similar to the B<Process> option this allows to select more detailed
2773 statistics of processes matching the specified I<regex> (see L<regex(7)> for
2774 details). The statistics of all matching processes are summed up and
2775 dispatched to the daemon using the specified I<name> as an identifier. This
2776 allows to "group" several processes together. I<name> must not contain
2781 =head2 Plugin C<protocols>
2783 Collects a lot of information about various network protocols, such as I<IP>,
2784 I<TCP>, I<UDP>, etc.
2786 Available configuration options:
2790 =item B<Value> I<Selector>
2792 Selects whether or not to select a specific value. The string being matched is
2793 of the form "I<Protocol>:I<ValueName>", where I<Protocol> will be used as the
2794 plugin instance and I<ValueName> will be used as type instance. An example of
2795 the string being used would be C<Tcp:RetransSegs>.
2797 You can use regular expressions to match a large number of values with just one
2798 configuration option. To select all "extended" I<TCP> values, you could use the
2799 following statement:
2803 Whether only matched values are selected or all matched values are ignored
2804 depends on the B<IgnoreSelected>. By default, only matched values are selected.
2805 If no value is configured at all, all values will be selected.
2807 =item B<IgnoreSelected> B<true>|B<false>
2809 If set to B<true>, inverts the selection made by B<Value>, i.E<nbsp>e. all
2810 matching values will be ignored.
2814 =head2 Plugin C<rrdcached>
2816 The C<rrdcached> plugin uses the RRDtool accelerator daemon, L<rrdcached(1)>,
2817 to store values to RRD files in an efficient manner. The combination of the
2818 C<rrdcached> B<plugin> and the C<rrdcached> B<daemon> is very similar to the
2819 way the C<rrdtool> plugin works (see below). The added abstraction layer
2820 provides a number of benefits, though: Because the cache is not within
2821 C<collectd> anymore, it does not need to be flushed when C<collectd> is to be
2822 restarted. This results in much shorter (if any) gaps in graphs, especially
2823 under heavy load. Also, the C<rrdtool> command line utility is aware of the
2824 daemon so that it can flush values to disk automatically when needed. This
2825 allows to integrate automated flushing of values into graphing solutions much
2828 There are disadvantages, though: The daemon may reside on a different host, so
2829 it may not be possible for C<collectd> to create the appropriate RRD files
2830 anymore. And even if C<rrdcached> runs on the same host, it may run in a
2831 different base directory, so relative paths may do weird stuff if you're not
2834 So the B<recommended configuration> is to let C<collectd> and C<rrdcached> run
2835 on the same host, communicating via a UNIX domain socket. The B<DataDir>
2836 setting should be set to an absolute path, so that a changed base directory
2837 does not result in RRD files being createdE<nbsp>/ expected in the wrong place.
2841 =item B<DaemonAddress> I<Address>
2843 Address of the daemon as understood by the C<rrdc_connect> function of the RRD
2844 library. See L<rrdcached(1)> for details. Example:
2846 <Plugin "rrdcached">
2847 DaemonAddress "unix:/var/run/rrdcached.sock"
2850 =item B<DataDir> I<Directory>
2852 Set the base directory in which the RRD files reside. If this is a relative
2853 path, it is relative to the working base directory of the C<rrdcached> daemon!
2854 Use of an absolute path is recommended.
2856 =item B<CreateFiles> B<true>|B<false>
2858 Enables or disables the creation of RRD files. If the daemon is not running
2859 locally, or B<DataDir> is set to a relative path, this will not work as
2860 expected. Default is B<true>.
2864 =head2 Plugin C<rrdtool>
2866 You can use the settings B<StepSize>, B<HeartBeat>, B<RRARows>, and B<XFF> to
2867 fine-tune your RRD-files. Please read L<rrdcreate(1)> if you encounter problems
2868 using these settings. If you don't want to dive into the depths of RRDtool, you
2869 can safely ignore these settings.
2873 =item B<DataDir> I<Directory>
2875 Set the directory to store RRD-files under. Per default RRD-files are generated
2876 beneath the daemon's working directory, i.E<nbsp>e. the B<BaseDir>.
2878 =item B<StepSize> I<Seconds>
2880 B<Force> the stepsize of newly created RRD-files. Ideally (and per default)
2881 this setting is unset and the stepsize is set to the interval in which the data
2882 is collected. Do not use this option unless you absolutely have to for some
2883 reason. Setting this option may cause problems with the C<snmp plugin>, the
2884 C<exec plugin> or when the daemon is set up to receive data from other hosts.
2886 =item B<HeartBeat> I<Seconds>
2888 B<Force> the heartbeat of newly created RRD-files. This setting should be unset
2889 in which case the heartbeat is set to twice the B<StepSize> which should equal
2890 the interval in which data is collected. Do not set this option unless you have
2891 a very good reason to do so.
2893 =item B<RRARows> I<NumRows>
2895 The C<rrdtool plugin> calculates the number of PDPs per CDP based on the
2896 B<StepSize>, this setting and a timespan. This plugin creates RRD-files with
2897 three times five RRAs, i. e. five RRAs with the CFs B<MIN>, B<AVERAGE>, and
2898 B<MAX>. The five RRAs are optimized for graphs covering one hour, one day, one
2899 week, one month, and one year.
2901 So for each timespan, it calculates how many PDPs need to be consolidated into
2902 one CDP by calculating:
2903 number of PDPs = timespan / (stepsize * rrarows)
2905 Bottom line is, set this no smaller than the width of you graphs in pixels. The
2908 =item B<RRATimespan> I<Seconds>
2910 Adds an RRA-timespan, given in seconds. Use this option multiple times to have
2911 more then one RRA. If this option is never used, the built-in default of (3600,
2912 86400, 604800, 2678400, 31622400) is used.
2914 For more information on how RRA-sizes are calculated see B<RRARows> above.
2916 =item B<XFF> I<Factor>
2918 Set the "XFiles Factor". The default is 0.1. If unsure, don't set this option.
2920 =item B<CacheFlush> I<Seconds>
2922 When the C<rrdtool> plugin uses a cache (by setting B<CacheTimeout>, see below)
2923 it writes all values for a certain RRD-file if the oldest value is older than
2924 (or equal to) the number of seconds specified. If some RRD-file is not updated
2925 anymore for some reason (the computer was shut down, the network is broken,
2926 etc.) some values may still be in the cache. If B<CacheFlush> is set, then the
2927 entire cache is searched for entries older than B<CacheTimeout> seconds and
2928 written to disk every I<Seconds> seconds. Since this is kind of expensive and
2929 does nothing under normal circumstances, this value should not be too small.
2930 900 seconds might be a good value, though setting this to 7200 seconds doesn't
2931 normally do much harm either.
2933 =item B<CacheTimeout> I<Seconds>
2935 If this option is set to a value greater than zero, the C<rrdtool plugin> will
2936 save values in a cache, as described above. Writing multiple values at once
2937 reduces IO-operations and thus lessens the load produced by updating the files.
2938 The trade off is that the graphs kind of "drag behind" and that more memory is
2941 =item B<WritesPerSecond> I<Updates>
2943 When collecting many statistics with collectd and the C<rrdtool> plugin, you
2944 will run serious performance problems. The B<CacheFlush> setting and the
2945 internal update queue assert that collectd continues to work just fine even
2946 under heavy load, but the system may become very unresponsive and slow. This is
2947 a problem especially if you create graphs from the RRD files on the same
2948 machine, for example using the C<graph.cgi> script included in the
2949 C<contrib/collection3/> directory.
2951 This setting is designed for very large setups. Setting this option to a value
2952 between 25 and 80 updates per second, depending on your hardware, will leave
2953 the server responsive enough to draw graphs even while all the cached values
2954 are written to disk. Flushed values, i.E<nbsp>e. values that are forced to disk
2955 by the B<FLUSH> command, are B<not> effected by this limit. They are still
2956 written as fast as possible, so that web frontends have up to date data when
2959 For example: If you have 100,000 RRD files and set B<WritesPerSecond> to 30
2960 updates per second, writing all values to disk will take approximately
2961 56E<nbsp>minutes. Together with the flushing ability that's integrated into
2962 "collection3" you'll end up with a responsive and fast system, up to date
2963 graphs and basically a "backup" of your values every hour.
2965 =item B<RandomTimeout> I<Seconds>
2967 When set, the actual timeout for each value is chosen randomly between
2968 I<CacheTimeout>-I<RandomTimeout> and I<CacheTimeout>+I<RandomTimeout>. The
2969 intention is to avoid high load situations that appear when many values timeout
2970 at the same time. This is especially a problem shortly after the daemon starts,
2971 because all values were added to the internal cache at roughly the same time.
2975 =head2 Plugin C<sensors>
2977 The C<sensors plugin> uses B<lm_sensors> to retrieve sensor-values. This means
2978 that all the needed modules have to be loaded and lm_sensors has to be
2979 configured (most likely by editing F</etc/sensors.conf>. Read
2980 L<sensors.conf(5)> for details.
2982 The B<lm_sensors> homepage can be found at
2983 L<http://secure.netroedge.com/~lm78/>.
2987 =item B<Sensor> I<chip-bus-address/type-feature>
2989 Selects the name of the sensor which you want to collect or ignore, depending
2990 on the B<IgnoreSelected> below. For example, the option "B<Sensor>
2991 I<it8712-isa-0290/voltage-in1>" will cause collectd to gather data for the
2992 voltage sensor I<in1> of the I<it8712> on the isa bus at the address 0290.
2994 =item B<IgnoreSelected> I<true>|I<false>
2996 If no configuration if given, the B<sensors>-plugin will collect data from all
2997 sensors. This may not be practical, especially for uninteresting sensors.
2998 Thus, you can use the B<Sensor>-option to pick the sensors you're interested
2999 in. Sometimes, however, it's easier/preferred to collect all sensors I<except> a
3000 few ones. This option enables you to do that: By setting B<IgnoreSelected> to
3001 I<true> the effect of B<Sensor> is inverted: All selected sensors are ignored
3002 and all other sensors are collected.
3006 =head2 Plugin C<snmp>
3008 Since the configuration of the C<snmp plugin> is a little more complicated than
3009 other plugins, its documentation has been moved to an own manpage,
3010 L<collectd-snmp(5)>. Please see there for details.
3012 =head2 Plugin C<syslog>
3016 =item B<LogLevel> B<debug|info|notice|warning|err>
3018 Sets the log-level. If, for example, set to B<notice>, then all events with
3019 severity B<notice>, B<warning>, or B<err> will be submitted to the
3022 Please note that B<debug> is only available if collectd has been compiled with
3027 =head2 Plugin C<table>
3029 The C<table plugin> provides generic means to parse tabular data and dispatch
3030 user specified values. Values are selected based on column numbers. For
3031 example, this plugin may be used to get values from the Linux L<proc(5)>
3032 filesystem or CSV (comma separated values) files.
3035 <Table "/proc/slabinfo">
3040 InstancePrefix "active_objs"
3046 InstancePrefix "objperslab"
3053 The configuration consists of one or more B<Table> blocks, each of which
3054 configures one file to parse. Within each B<Table> block, there are one or
3055 more B<Result> blocks, which configure which data to select and how to
3058 The following options are available inside a B<Table> block:
3062 =item B<Instance> I<instance>
3064 If specified, I<instance> is used as the plugin instance. So, in the above
3065 example, the plugin name C<table-slabinfo> would be used. If omitted, the
3066 filename of the table is used instead, with all special characters replaced
3067 with an underscore (C<_>).
3069 =item B<Separator> I<string>
3071 Any character of I<string> is interpreted as a delimiter between the different
3072 columns of the table. A sequence of two or more contiguous delimiters in the
3073 table is considered to be a single delimiter, i.E<nbsp>e. there cannot be any
3074 empty columns. The plugin uses the L<strtok_r(3)> function to parse the lines
3075 of a table - see its documentation for more details. This option is mandatory.
3077 A horizontal tab, newline and carriage return may be specified by C<\\t>,
3078 C<\\n> and C<\\r> respectively. Please note that the double backslashes are
3079 required because of collectd's config parsing.
3083 The following options are available inside a B<Result> block:
3087 =item B<Type> I<type>
3089 Sets the type used to dispatch the values to the daemon. Detailed information
3090 about types and their configuration can be found in L<types.db(5)>. This
3091 option is mandatory.
3093 =item B<InstancePrefix> I<prefix>
3095 If specified, prepend I<prefix> to the type instance. If omitted, only the
3096 B<InstancesFrom> option is considered for the type instance.
3098 =item B<InstancesFrom> I<column0> [I<column1> ...]
3100 If specified, the content of the given columns (identified by the column
3101 number starting at zero) will be used to create the type instance for each
3102 row. Multiple values (and the instance prefix) will be joined together with
3103 dashes (I<->) as separation character. If omitted, only the B<InstancePrefix>
3104 option is considered for the type instance.
3106 The plugin itself does not check whether or not all built instances are
3107 different. It’s your responsibility to assure that each is unique. This is
3108 especially true, if you do not specify B<InstancesFrom>: B<You> have to make
3109 sure that the table only contains one row.
3111 If neither B<InstancePrefix> nor B<InstancesFrom> is given, the type instance
3114 =item B<ValuesFrom> I<column0> [I<column1> ...]
3116 Specifies the columns (identified by the column numbers starting at zero)
3117 whose content is used as the actual data for the data sets that are dispatched
3118 to the daemon. How many such columns you need is determined by the B<Type>
3119 setting above. If you specify too many or not enough columns, the plugin will
3120 complain about that and no data will be submitted to the daemon. The plugin
3121 uses L<strtoll(3)> and L<strtod(3)> to parse counter and gauge values
3122 respectively, so anything supported by those functions is supported by the
3123 plugin as well. This option is mandatory.
3127 =head2 Plugin C<tail>
3129 The C<tail plugin> follows logfiles, just like L<tail(1)> does, parses
3130 each line and dispatches found values. What is matched can be configured by the
3131 user using (extended) regular expressions, as described in L<regex(7)>.
3134 <File "/var/log/exim4/mainlog">
3137 Regex "S=([1-9][0-9]*)"
3143 Regex "\\<R=local_user\\>"
3146 Instance "local_user"
3151 The config consists of one or more B<File> blocks, each of which configures one
3152 logfile to parse. Within each B<File> block, there are one or more B<Match>
3153 blocks, which configure a regular expression to search for.
3155 The B<Instance> option in the B<File> block may be used to set the plugin
3156 instance. So in the above example the plugin name C<tail-foo> would be used.
3157 This plugin instance is for all B<Match> blocks that B<follow> it, until the
3158 next B<Instance> option. This way you can extract several plugin instances from
3159 one logfile, handy when parsing syslog and the like.
3161 Each B<Match> block has the following options to describe how the match should
3166 =item B<Regex> I<regex>
3168 Sets the regular expression to use for matching against a line. The first
3169 subexpression has to match something that can be turned into a number by
3170 L<strtoll(3)> or L<strtod(3)>, depending on the value of C<CounterAdd>, see
3171 below. Because B<extended> regular expressions are used, you do not need to use
3172 backslashes for subexpressions! If in doubt, please consult L<regex(7)>. Due to
3173 collectd's config parsing you need to escape backslashes, though. So if you
3174 want to match literal parentheses you need to do the following:
3176 Regex "SPAM \\(Score: (-?[0-9]+\\.[0-9]+)\\)"
3178 =item B<DSType> I<Type>
3180 Sets how the values are cumulated. I<Type> is one of:
3184 =item B<GaugeAverage>
3186 Calculate the average.
3190 Use the smallest number only.
3194 Use the greatest number only.
3198 Use the last number found.
3202 The matched number is a counter. Simply sets the internal counter to this
3207 Add the matched value to the internal counter.
3211 Increase the internal counter by one. This B<DSType> is the only one that does
3212 not use the matched subexpression, but simply counts the number of matched
3213 lines. Thus, you may use a regular expression without submatch in this case.
3217 As you'd expect the B<Gauge*> types interpret the submatch as a floating point
3218 number, using L<strtod(3)>. The B<CounterSet> and B<CounterAdd> interpret the
3219 submatch as an integer using L<strtoll(3)>. B<CounterInc> does not use the
3220 submatch at all and it may be omitted in this case.
3222 =item B<Type> I<Type>
3224 Sets the type used to dispatch this value. Detailed information about types and
3225 their configuration can be found in L<types.db(5)>.
3227 =item B<Instance> I<TypeInstance>
3229 This optional setting sets the type instance to use.
3233 =head2 Plugin C<teamspeak2>
3235 The C<teamspeak2 plugin> connects to the query port of a teamspeak2 server and
3236 polls interesting global and virtual server data. The plugin can query only one
3237 physical server but unlimited virtual servers. You can use the following
3238 options to configure it:
3242 =item B<Host> I<hostname/ip>
3244 The hostname or ip which identifies the physical server.
3247 =item B<Port> I<port>
3249 The query port of the physical server. This needs to be a string.
3252 =item B<Server> I<port>
3254 This option has to be added once for every virtual server the plugin should
3255 query. If you want to query the virtual server on port 8767 this is what the
3256 option would look like:
3260 This option, although numeric, needs to be a string, i.E<nbsp>e. you B<must>
3261 use quotes around it! If no such statement is given only global information
3266 =head2 Plugin C<ted>
3268 The I<TED> plugin connects to a device of "The Energy Detective", a device to
3269 measure power consumption. These devices are usually connected to a serial
3270 (RS232) or USB port. The plugin opens a configured device and tries to read the
3271 current energy readings. For more information on TED, visit
3272 L<http://www.theenergydetective.com/>.
3274 Available configuration options:
3278 =item B<Device> I<Path>
3280 Path to the device on which TED is connected. collectd will need read and write
3281 permissions on that file.
3283 Default: B</dev/ttyUSB0>
3285 =item B<Retries> I<Num>
3287 Apparently reading from TED is not that reliable. You can therefore configure a
3288 number of retries here. You only configure the I<retries> here, to if you
3289 specify zero, one reading will be performed (but no retries if that fails); if
3290 you specify three, a maximum of four readings are performed. Negative values
3297 =head2 Plugin C<tcpconns>
3299 The C<tcpconns plugin> counts the number of currently established TCP
3300 connections based on the local port and/or the remote port. Since there may be
3301 a lot of connections the default if to count all connections with a local port,
3302 for which a listening socket is opened. You can use the following options to
3303 fine-tune the ports you are interested in:
3307 =item B<ListeningPorts> I<true>|I<false>
3309 If this option is set to I<true>, statistics for all local ports for which a
3310 listening socket exists are collected. The default depends on B<LocalPort> and
3311 B<RemotePort> (see below): If no port at all is specifically selected, the
3312 default is to collect listening ports. If specific ports (no matter if local or
3313 remote ports) are selected, this option defaults to I<false>, i.E<nbsp>e. only
3314 the selected ports will be collected unless this option is set to I<true>
3317 =item B<LocalPort> I<Port>
3319 Count the connections to a specific local port. This can be used to see how
3320 many connections are handled by a specific daemon, e.E<nbsp>g. the mailserver.
3321 You have to specify the port in numeric form, so for the mailserver example
3322 you'd need to set B<25>.
3324 =item B<RemotePort> I<Port>
3326 Count the connections to a specific remote port. This is useful to see how
3327 much a remote service is used. This is most useful if you want to know how many
3328 connections a local service has opened to remote services, e.E<nbsp>g. how many
3329 connections a mail server or news server has to other mail or news servers, or
3330 how many connections a web proxy holds to web servers. You have to give the
3331 port in numeric form.
3335 =head2 Plugin C<thermal>
3339 =item B<ForceUseProcfs> I<true>|I<false>
3341 By default, the C<thermal> plugin tries to read the statistics from the Linux
3342 C<sysfs> interface. If that is not available, the plugin falls back to the
3343 C<procfs> interface. By setting this option to I<true>, you can force the
3344 plugin to use the latter. This option defaults to I<false>.
3346 =item B<Device> I<Device>
3348 Selects the name of the thermal device that you want to collect or ignore,
3349 depending on the value of the B<IgnoreSelected> option. This option may be
3350 used multiple times to specify a list of devices.
3352 =item B<IgnoreSelected> I<true>|I<false>
3354 Invert the selection: If set to true, all devices B<except> the ones that
3355 match the device names specified by the B<Device> option are collected. By
3356 default only selected devices are collected if a selection is made. If no
3357 selection is configured at all, B<all> devices are selected.
3361 =head2 Plugin C<tokyotyrant>
3363 The C<tokyotyrant plugin> connects to a TokyoTyrant server and collects a
3364 couple metrics: number of records, and database size on disk.
3368 =item B<Host> I<Hostname/IP>
3370 The hostname or ip which identifies the server.
3371 Default: B<127.0.0.1>
3373 =item B<Port> I<Service/Port>
3375 The query port of the server. This needs to be a string, even if the port is
3376 given in its numeric form.
3381 =head2 Plugin C<unixsock>
3385 =item B<SocketFile> I<Path>
3387 Sets the socket-file which is to be created.
3389 =item B<SocketGroup> I<Group>
3391 If running as root change the group of the UNIX-socket after it has been
3392 created. Defaults to B<collectd>.
3394 =item B<SocketPerms> I<Permissions>
3396 Change the file permissions of the UNIX-socket after it has been created. The
3397 permissions must be given as a numeric, octal value as you would pass to
3398 L<chmod(1)>. Defaults to B<0770>.
3402 =head2 Plugin C<uuid>
3404 This plugin, if loaded, causes the Hostname to be taken from the machine's
3405 UUID. The UUID is a universally unique designation for the machine, usually
3406 taken from the machine's BIOS. This is most useful if the machine is running in
3407 a virtual environment such as Xen, in which case the UUID is preserved across
3408 shutdowns and migration.
3410 The following methods are used to find the machine's UUID, in order:
3416 Check I</etc/uuid> (or I<UUIDFile>).
3420 Check for UUID from HAL (L<http://www.freedesktop.org/wiki/Software/hal>) if
3425 Check for UUID from C<dmidecode> / SMBIOS.
3429 Check for UUID from Xen hypervisor.
3433 If no UUID can be found then the hostname is not modified.
3437 =item B<UUIDFile> I<Path>
3439 Take the UUID from the given file (default I</etc/uuid>).
3443 =head2 Plugin C<vmem>
3445 The C<vmem> plugin collects information about the usage of virtual memory.
3446 Since the statistics provided by the Linux kernel are very detailed, they are
3447 collected very detailed. However, to get all the details, you have to switch
3448 them on manually. Most people just want an overview over, such as the number of
3449 pages read from swap space.
3453 =item B<Verbose> B<true>|B<false>
3455 Enables verbose collection of information. This will start collecting page
3456 "actions", e.E<nbsp>g. page allocations, (de)activations, steals and so on.
3457 Part of these statistics are collected on a "per zone" basis.
3461 =head2 Plugin C<vserver>
3463 This plugin doesn't have any options. B<VServer> support is only available for
3464 Linux. It cannot yet be found in a vanilla kernel, though. To make use of this
3465 plugin you need a kernel that has B<VServer> support built in, i.E<nbsp>e. you
3466 need to apply the patches and compile your own kernel, which will then provide
3467 the F</proc/virtual> filesystem that is required by this plugin.
3469 The B<VServer> homepage can be found at L<http://linux-vserver.org/>.
3471 B<Note>: The traffic collected by this plugin accounts for the amount of
3472 traffic passing a socket which might be a lot less than the actual on-wire
3473 traffic (e.E<nbsp>g. due to headers and retransmission). If you want to
3474 collect on-wire traffic you could, for example, use the logging facilities of
3475 iptables to feed data for the guest IPs into the iptables plugin.
3477 =head1 THRESHOLD CONFIGURATION
3479 Starting with version C<4.3.0> collectd has support for B<monitoring>. By that
3480 we mean that the values are not only stored or sent somewhere, but that they
3481 are judged and, if a problem is recognized, acted upon. The only action
3482 collectd takes itself is to generate and dispatch a "notification". Plugins can
3483 register to receive notifications and perform appropriate further actions.
3485 Since systems and what you expect them to do differ a lot, you can configure
3486 B<thresholds> for your values freely. This gives you a lot of flexibility but
3487 also a lot of responsibility.
3489 Every time a value is out of range a notification is dispatched. This means
3490 that the idle percentage of your CPU needs to be less then the configured
3491 threshold only once for a notification to be generated. There's no such thing
3492 as a moving average or similar - at least not now.
3494 Also, all values that match a threshold are considered to be relevant or
3495 "interesting". As a consequence collectd will issue a notification if they are
3496 not received for twice the last timeout of the values. If, for example, some
3497 hosts sends it's CPU statistics to the server every 60 seconds, a notification
3498 will be dispatched after about 120 seconds. It may take a little longer because
3499 the timeout is checked only once each B<Interval> on the server.
3501 When a value comes within range again or is received after it was missing, an
3502 "OKAY-notification" is dispatched.
3504 Here is a configuration example to get you started. Read below for more
3517 <Plugin "interface">
3534 WarningMin 100000000
3540 There are basically two types of configuration statements: The C<Host>,
3541 C<Plugin>, and C<Type> blocks select the value for which a threshold should be
3542 configured. The C<Plugin> and C<Type> blocks may be specified further using the
3543 C<Instance> option. You can combine the block by nesting the blocks, though
3544 they must be nested in the above order, i.E<nbsp>e. C<Host> may contain either
3545 C<Plugin> and C<Type> blocks, C<Plugin> may only contain C<Type> blocks and
3546 C<Type> may not contain other blocks. If multiple blocks apply to the same
3547 value the most specific block is used.
3549 The other statements specify the threshold to configure. They B<must> be
3550 included in a C<Type> block. Currently the following statements are recognized:
3554 =item B<FailureMax> I<Value>
3556 =item B<WarningMax> I<Value>
3558 Sets the upper bound of acceptable values. If unset defaults to positive
3559 infinity. If a value is greater than B<FailureMax> a B<FAILURE> notification
3560 will be created. If the value is greater than B<WarningMax> but less than (or
3561 equal to) B<FailureMax> a B<WARNING> notification will be created.
3563 =item B<FailureMin> I<Value>
3565 =item B<WarningMin> I<Value>
3567 Sets the lower bound of acceptable values. If unset defaults to negative
3568 infinity. If a value is less than B<FailureMin> a B<FAILURE> notification will
3569 be created. If the value is less than B<WarningMin> but greater than (or equal
3570 to) B<FailureMin> a B<WARNING> notification will be created.
3572 =item B<DataSource> I<DSName>
3574 Some data sets have more than one "data source". Interesting examples are the
3575 C<if_octets> data set, which has received (C<rx>) and sent (C<tx>) bytes and
3576 the C<disk_ops> data set, which holds C<read> and C<write> operations. The
3577 system load data set, C<load>, even has three data sources: C<shortterm>,
3578 C<midterm>, and C<longterm>.
3580 Normally, all data sources are checked against a configured threshold. If this
3581 is undesirable, or if you want to specify different limits for each data
3582 source, you can use the B<DataSource> option to have a threshold apply only to
3585 =item B<Invert> B<true>|B<false>
3587 If set to B<true> the range of acceptable values is inverted, i.E<nbsp>e.
3588 values between B<FailureMin> and B<FailureMax> (B<WarningMin> and
3589 B<WarningMax>) are not okay. Defaults to B<false>.
3591 =item B<Persist> B<true>|B<false>
3593 Sets how often notifications are generated. If set to B<true> one notification
3594 will be generated for each value that is out of the acceptable range. If set to
3595 B<false> (the default) then a notification is only generated if a value is out
3596 of range but the previous value was okay.
3598 This applies to missing values, too: If set to B<true> a notification about a
3599 missing value is generated once every B<Interval> seconds. If set to B<false>
3600 only one such notification is generated until the value appears again.
3602 =item B<Percentage> B<true>|B<false>
3604 If set to B<true>, the minimum and maximum values given are interpreted as
3605 percentage value, relative to the other data sources. This is helpful for
3606 example for the "df" type, where you may want to issue a warning when less than
3607 5E<nbsp>% of the total space is available. Defaults to B<false>.
3611 =head1 FILTER CONFIGURATION
3613 Starting with collectd 4.6 there is a powerful filtering infrastructure
3614 implemented in the daemon. The concept has mostly been copied from
3615 I<ip_tables>, the packet filter infrastructure for Linux. We'll use a similar
3616 terminology, so that users that are familiar with iptables feel right at home.
3620 The following are the terms used in the remainder of the filter configuration
3621 documentation. For an ASCII-art schema of the mechanism, see
3622 L<"General structure"> below.
3628 A I<match> is a criteria to select specific values. Examples are, of course, the
3629 name of the value or it's current value.
3631 Matches are implemented in plugins which you have to load prior to using the
3632 match. The name of such plugins starts with the "match_" prefix.
3636 A I<target> is some action that is to be performed with data. Such actions
3637 could, for example, be to change part of the value's identifier or to ignore
3638 the value completely.
3640 Some of these targets are built into the daemon, see L<"Built-in targets">
3641 below. Other targets are implemented in plugins which you have to load prior to
3642 using the target. The name of such plugins starts with the "target_" prefix.
3646 The combination of any number of matches and at least one target is called a
3647 I<rule>. The target actions will be performed for all values for which B<all>
3648 matches apply. If the rule does not have any matches associated with it, the
3649 target action will be performed for all values.
3653 A I<chain> is a list of rules and possibly default targets. The rules are tried
3654 in order and if one matches, the associated target will be called. If a value
3655 is handled by a rule, it depends on the target whether or not any subsequent
3656 rules are considered or if traversal of the chain is aborted, see
3657 L<"Flow control"> below. After all rules have been checked, the default targets
3662 =head2 General structure
3664 The following shows the resulting structure:
3671 +---------+ +---------+ +---------+ +---------+
3672 ! Rule !->! Match !->! Match !->! Target !
3673 +---------+ +---------+ +---------+ +---------+
3676 +---------+ +---------+ +---------+
3677 ! Rule !->! Target !->! Target !
3678 +---------+ +---------+ +---------+
3685 +---------+ +---------+ +---------+
3686 ! Rule !->! Match !->! Target !
3687 +---------+ +---------+ +---------+
3697 There are four ways to control which way a value takes through the filter
3704 The built-in B<jump> target can be used to "call" another chain, i.E<nbsp>e.
3705 process the value with another chain. When the called chain finishes, usually
3706 the next target or rule after the jump is executed.
3710 The stop condition, signaled for example by the built-in target B<stop>, causes
3711 all processing of the value to be stopped immediately.
3715 Causes processing in the current chain to be aborted, but processing of the
3716 value generally will continue. This means that if the chain was called via
3717 B<Jump>, the next target or rule after the jump will be executed. If the chain
3718 was not called by another chain, control will be returned to the daemon and it
3719 may pass the value to another chain.
3723 Most targets will signal the B<continue> condition, meaning that processing
3724 should continue normally. There is no special built-in target for this
3731 The configuration reflects this structure directly:
3733 PostCacheChain "PostCache"
3735 <Rule "ignore_mysql_show">
3738 Type "^mysql_command$"
3739 TypeInstance "^show_"
3749 The above configuration example will ignore all values where the plugin field
3750 is "mysql", the type is "mysql_command" and the type instance begins with
3751 "show_". All other values will be sent to the C<rrdtool> write plugin via the
3752 default target of the chain. Since this chain is run after the value has been
3753 added to the cache, the MySQL C<show_*> command statistics will be available
3754 via the C<unixsock> plugin.
3756 =head2 List of configuration options
3760 =item B<PreCacheChain> I<ChainName>
3762 =item B<PostCacheChain> I<ChainName>
3764 Configure the name of the "pre-cache chain" and the "post-cache chain". The
3765 argument is the name of a I<chain> that should be executed before and/or after
3766 the values have been added to the cache.
3768 To understand the implications, it's important you know what is going on inside
3769 I<collectd>. The following diagram shows how values are passed from the
3770 read-plugins to the write-plugins:
3776 + - - - - V - - - - +
3777 : +---------------+ :
3780 : +-------+-------+ :
3783 : +-------+-------+ : +---------------+
3784 : ! Cache !--->! Value Cache !
3785 : ! insert ! : +---+---+-------+
3786 : +-------+-------+ : ! !
3787 : ! ,------------' !
3789 : +-------+---+---+ : +-------+-------+
3790 : ! Post-Cache +--->! Write-Plugins !
3791 : ! Chain ! : +---------------+
3792 : +---------------+ :
3795 + - - - - - - - - - +
3797 After the values are passed from the "read" plugins to the dispatch functions,
3798 the pre-cache chain is run first. The values are added to the internal cache
3799 afterwards. The post-cache chain is run after the values have been added to the
3800 cache. So why is it such a huge deal if chains are run before or after the
3801 values have been added to this cache?
3803 Targets that change the identifier of a value list should be executed before
3804 the values are added to the cache, so that the name in the cache matches the
3805 name that is used in the "write" plugins. The C<unixsock> plugin, too, uses
3806 this cache to receive a list of all available values. If you change the
3807 identifier after the value list has been added to the cache, this may easily
3808 lead to confusion, but it's not forbidden of course.
3810 The cache is also used to convert counter values to rates. These rates are, for
3811 example, used by the C<value> match (see below). If you use the rate stored in
3812 the cache B<before> the new value is added, you will use the old, B<previous>
3813 rate. Write plugins may use this rate, too, see the C<csv> plugin, for example.
3814 The C<unixsock> plugin uses these rates too, to implement the C<GETVAL>
3817 Last but not last, the B<stop> target makes a difference: If the pre-cache
3818 chain returns the stop condition, the value will not be added to the cache and
3819 the post-cache chain will not be run.
3821 =item B<Chain> I<Name>
3823 Adds a new chain with a certain name. This name can be used to refer to a
3824 specific chain, for example to jump to it.
3826 Within the B<Chain> block, there can be B<Rule> blocks and B<Target> blocks.
3828 =item B<Rule> [I<Name>]
3830 Adds a new rule to the current chain. The name of the rule is optional and
3831 currently has no meaning for the daemon.
3833 Within the B<Rule> block, there may be any number of B<Match> blocks and there
3834 must be at least one B<Target> block.
3836 =item B<Match> I<Name>
3838 Adds a match to a B<Rule> block. The name specifies what kind of match should
3839 be performed. Available matches depend on the plugins that have been loaded.
3841 The arguments inside the B<Match> block are passed to the plugin implementing
3842 the match, so which arguments are valid here depends on the plugin being used.
3843 If you do not need any to pass any arguments to a match, you can use the
3848 Which is equivalent to:
3853 =item B<Target> I<Name>
3855 Add a target to a rule or a default target to a chain. The name specifies what
3856 kind of target is to be added. Which targets are available depends on the
3857 plugins being loaded.
3859 The arguments inside the B<Target> block are passed to the plugin implementing
3860 the target, so which arguments are valid here depends on the plugin being used.
3861 If you do not need any to pass any arguments to a target, you can use the
3866 This is the same as writing:
3873 =head2 Built-in targets
3875 The following targets are built into the core daemon and therefore need no
3876 plugins to be loaded:
3882 Signals the "return" condition, see the L<"Flow control"> section above. This
3883 causes the current chain to stop processing the value and returns control to
3884 the calling chain. The calling chain will continue processing targets and rules
3885 just after the B<jump> target (see below). This is very similar to the
3886 B<RETURN> target of iptables, see L<iptables(8)>.
3888 This target does not have any options.
3896 Signals the "stop" condition, see the L<"Flow control"> section above. This
3897 causes processing of the value to be aborted immediately. This is similar to
3898 the B<DROP> target of iptables, see L<iptables(8)>.
3900 This target does not have any options.
3908 Sends the value to "write" plugins.
3914 =item B<Plugin> I<Name>
3916 Name of the write plugin to which the data should be sent. This option may be
3917 given multiple times to send the data to more than one write plugin.
3921 If no plugin is explicitly specified, the values will be sent to all available
3932 Starts processing the rules of another chain, see L<"Flow control"> above. If
3933 the end of that chain is reached, or a stop condition is encountered,
3934 processing will continue right after the B<jump> target, i.E<nbsp>e. with the
3935 next target or the next rule. This is similar to the B<-j> command line option
3936 of iptables, see L<iptables(8)>.
3942 =item B<Chain> I<Name>
3944 Jumps to the chain I<Name>. This argument is required and may appear only once.
3956 =head2 Available matches
3962 Matches a value using regular expressions.
3968 =item B<Host> I<Regex>
3970 =item B<Plugin> I<Regex>
3972 =item B<PluginInstance> I<Regex>
3974 =item B<Type> I<Regex>
3976 =item B<TypeInstance> I<Regex>
3978 Match values where the given regular expressions match the various fields of
3979 the identifier of a value. If multiple regular expressions are given, B<all>
3980 regexen must match for a value to match.
3987 Host "customer[0-9]+"
3993 Matches values that have a time which differs from the time on the server.
3995 This match is mainly intended for servers that receive values over the
3996 C<network> plugin and write them to disk using the C<rrdtool> plugin. RRDtool
3997 is very sensitive to the timestamp used when updating the RRD files. In
3998 particular, the time must be ever increasing. If a misbehaving client sends one
3999 packet with a timestamp far in the future, all further packets with a correct
4000 time will be ignored because of that one packet. What's worse, such corrupted
4001 RRD files are hard to fix.
4003 This match lets one match all values B<outside> a specified time range
4004 (relative to the server's time), so you can use the B<stop> target (see below)
4005 to ignore the value, for example.
4011 =item B<Future> I<Seconds>
4013 Matches all values that are I<ahead> of the server's time by I<Seconds> or more
4014 seconds. Set to zero for no limit. Either B<Future> or B<Past> must be
4017 =item B<Past> I<Seconds>
4019 Matches all values that are I<behind> of the server's time by I<Seconds> or
4020 more seconds. Set to zero for no limit. Either B<Future> or B<Past> must be
4032 This example matches all values that are five minutes or more ahead of the
4033 server or one hour (or more) lagging behind.
4037 Matches the actual value of data sources against given minimumE<nbsp>/ maximum
4038 values. If a data-set consists of more than one data-source, all data-sources
4039 must match the specified ranges for a positive match.
4045 =item B<Min> I<Value>
4047 Sets the smallest value which still results in a match. If unset, behaves like
4050 =item B<Max> I<Value>
4052 Sets the largest value which still results in a match. If unset, behaves like
4055 =item B<Invert> B<true>|B<false>
4057 Inverts the selection. If the B<Min> and B<Max> settings result in a match,
4058 no-match is returned and vice versa. Please note that the B<Invert> setting
4059 only effects how B<Min> and B<Max> are applied to a specific value. Especially
4060 the B<DataSource> and B<Satisfy> settings (see below) are not inverted.
4062 =item B<DataSource> I<DSName> [I<DSName> ...]
4064 Select one or more of the data sources. If no data source is configured, all
4065 data sources will be checked. If the type handled by the match does not have a
4066 data source of the specified name(s), this will always result in no match
4067 (independent of the B<Invert> setting).
4069 =item B<Satisfy> B<Any>|B<All>
4071 Specifies how checking with several data sources is performed. If set to
4072 B<Any>, the match succeeds if one of the data sources is in the configured
4073 range. If set to B<All> the match only succeeds if all data sources are within
4074 the configured range. Default is B<All>.
4076 Usually B<All> is used for positive matches, B<Any> is used for negative
4077 matches. This means that with B<All> you usually check that all values are in a
4078 "good" range, while with B<Any> you check if any value is within a "bad" range
4079 (or outside the "good" range).
4083 Either B<Min> or B<Max>, but not both, may be unset.
4087 # Match all values smaller than or equal to 100. Matches only if all data
4088 # sources are below 100.
4094 # Match if the value of any data source is outside the range of 0 - 100.
4102 =item B<empty_counter>
4104 Matches all values with one or more data sources of type B<COUNTER> and where
4105 all counter values are zero. These counters usually I<never> increased since
4106 they started existing (and are therefore uninteresting), or got reset recently
4107 or overflowed and you had really, I<really> bad luck.
4109 Please keep in mind that ignoring such counters can result in confusing
4110 behavior: Counters which hardly ever increase will be zero for long periods of
4111 time. If the counter is reset for some reason (machine or service restarted,
4112 usually), the graph will be empty (NAN) for a long time. People may not
4117 =head2 Available targets
4121 =item B<notification>
4123 Creates and dispatches a notification.
4129 =item B<Message> I<String>
4131 This required option sets the message of the notification. The following
4132 placeholders will be replaced by an appropriate value:
4140 =item B<%{plugin_instance}>
4144 =item B<%{type_instance}>
4146 These placeholders are replaced by the identifier field of the same name.
4148 =item B<%{ds:>I<name>B<}>
4150 These placeholders are replaced by a (hopefully) human readable representation
4151 of the current rate of this data source. If you changed the instance name
4152 (using the B<set> or B<replace> targets, see below), it may not be possible to
4153 convert counter values to rates.
4157 Please note that these placeholders are B<case sensitive>!
4159 =item B<Severity> B<"FATAL">|B<"WARNING">|B<"OKAY">
4161 Sets the severity of the message. If omitted, the severity B<"WARNING"> is
4168 <Target "notification">
4169 Message "Oops, the %{type_instance} temperature is currently %{ds:value}!"
4175 Replaces parts of the identifier using regular expressions.
4181 =item B<Host> I<Regex> I<Replacement>
4183 =item B<Plugin> I<Regex> I<Replacement>
4185 =item B<PluginInstance> I<Regex> I<Replacement>
4187 =item B<TypeInstance> I<Regex> I<Replacement>
4189 Match the appropriate field with the given regular expression I<Regex>. If the
4190 regular expression matches, that part that matches is replaced with
4191 I<Replacement>. If multiple places of the input buffer match a given regular
4192 expression, only the first occurrence will be replaced.
4194 You can specify each option multiple times to use multiple regular expressions
4202 # Replace "example.net" with "example.com"
4203 Host "\\<example.net\\>" "example.com"
4205 # Strip "www." from hostnames
4211 Sets part of the identifier of a value to a given string.
4217 =item B<Host> I<String>
4219 =item B<Plugin> I<String>
4221 =item B<PluginInstance> I<String>
4223 =item B<TypeInstance> I<String>
4225 Set the appropriate field to the given string. The strings for plugin instance
4226 and type instance may be empty, the strings for host and plugin may not be
4227 empty. It's currently not possible to set the type of a value this way.
4234 PluginInstance "coretemp"
4235 TypeInstance "core3"
4240 =head2 Backwards compatibility
4242 If you use collectd with an old configuration, i.E<nbsp>e. one without a
4243 B<Chain> block, it will behave as it used to. This is equivalent to the
4244 following configuration:
4250 If you specify a B<PostCacheChain>, the B<write> target will not be added
4251 anywhere and you will have to make sure that it is called where appropriate. We
4252 suggest to add the above snippet as default target to your "PostCache" chain.
4256 Ignore all values, where the hostname does not contain a dot, i.E<nbsp>e. can't
4272 L<collectd-exec(5)>,
4273 L<collectd-perl(5)>,
4274 L<collectd-unixsock(5)>,
4287 Florian Forster E<lt>octo@verplant.orgE<gt>