=head1 NAME collectd.conf - Configuration for the system statistics collection daemon B =head1 SYNOPSIS BaseDir "/path/to/data/" PIDFile "/path/to/pidfile/collectd.pid" Server "123.123.123.123" 12345 LoadPlugin cpu LoadPlugin load LoadPlugin ping Host "example.org" Host "provider.net" =head1 DESCRIPTION This config file controls how the system statistics collection daemon B behaves. The most significant option is B, which controls which plugins to load. These plugins ultimately define collectd's behavior. The syntax of this config file is similar to the config file of the famous B. Each line contains either a key-value-pair or a section-start or -end. Empty lines and everything after the hash-symbol `#' is ignored. Values are either string, enclosed in double-quotes, (floating-point-)numbers or a boolean expression, i.Ee. either B or B. String containing of only alphanumeric characters and underscores do not need to be quoted. Lines may be wrapped by using `\' as the last character before the newline. This allows long lines to be split into multiple lines. Quoted strings may be wrapped as well. However, those are treated special in that whitespace at the beginning of the following lines will be ignored, which allows for nicely indenting the wrapped lines. The configuration is read and processed in order, i.Ee. from top to bottom. So the plugins are loaded in the order listed in this config file. It is a good idea to load any logging plugins first in order to catch messages from plugins during configuration. Also, the C option B occur B the CPlugin ...E> block. =head1 GLOBAL OPTIONS =over 4 =item B I Sets the base directory. This is the directory beneath all RRD-files are created. Possibly more subdirectories are created. This is also the working directory for the daemon. =item B I Loads the plugin I. There must be at least one such line or B will be mostly useless. =item B I If I points to a file, includes that file. If I points to a directory, recursively includes all files within that directory and its subdirectories. If the C function is available on your system, shell-like wildcards are expanded before files are included. This means you can use statements like the following: Include "/etc/collectd.d/*.conf" If more than one files are included by a single B option, the files will be included in lexicographical order (as defined by the C function). Thus, you can e.Eg. use numbered prefixes to specify the order in which the files are loaded. To prevent loops and shooting yourself in the foot in interesting ways the nesting is limited to a depth of 8Elevels, which should be sufficient for most uses. Since symlinks are followed it is still possible to crash the daemon by looping symlinks. In our opinion significant stupidity should result in an appropriate amount of pain. It is no problem to have a block like CPlugin fooE> in more than one file, but you cannot include files from within blocks. =item B I Sets where to write the PID file to. This file is overwritten when it exists and deleted when the program is stopped. Some init-scripts might override this setting using the B<-P> command-line option. =item B I Path to the plugins (shared objects) of collectd. =item B I [I ...] Set one or more files that contain the data-set descriptions. See L for a description of the format of this file. =item B I Configures the interval in which to query the read plugins. Obviously smaller values lead to a higher system load produced by collectd, while higher values lead to more coarse statistics. =item B I Number of threads to start for reading plugins. The default value is B<5>, but you may want to increase this if you have more than five plugins that take a long time to read. Mostly those are plugin that do network-IO. Setting this to a value higher than the number of plugins you've loaded is totally useless. =item B I Sets the hostname that identifies a host. If you omit this setting, the hostname will be determinded using the L system call. =item B B If B is determined automatically this setting controls whether or not the daemon should try to figure out the "fully qualified domain name", FQDN. This is done using a lookup of the name returned by C. Using this feature (i.Ee. setting this option to B) is recommended. However, to preserve backwards compatibility the default is set to B. The sample config file that is installed with Cinstall> includes a line which sets this option, though, so that default installations will have this setting enabled. =back =head1 PLUGIN OPTIONS Some plugins may register own options. These options must be enclosed in a C-Section. Which options exist depends on the plugin used. Some plugins require external configuration, too. The C, for example, required C to be configured in the webserver you're going to collect data from. These plugins are listed below as well, even if they don't require any configuration within collectd's configfile. A list of all plugins and a short summary for each plugin can be found in the F file shipped with the sourcecode and hopefully binary packets as well. =head2 Plugin C To configure the C-plugin you first need to configure the Apache webserver correctly. The Apache-plugin C needs to be loaded and working and the C directive needs to be B. You can use the following snipped to base your Apache config upon: ExtendedStatus on SetHandler server-status Since its C module is very similar to Apache's, B is also supported. It introduces a new field, called C, to count the number of currently connected clients. This field is also supported. The following options are accepted by the C-plugin: =over 4 =item B I Sets the URL of the C output. This needs to be the output generated by C and it needs to be the machine readable output generated by appending the C argument. =item B I Optional user name needed for authentication. =item B I Optional password needed for authentication. =item B B Enable or disable peer SSL certificate verification. See L for details. Enabled by default. =item B B Enable or disable peer host name verification. If enabled, the plugin checks if the C or a C field of the SSL certificate matches the host name provided by the B option. If this identity check fails, the connection is aborted. Obviously, only works when connecting to a SSL enabled server. Enabled by default. =item B I File that holds one or more SSL certificates. If you want to use HTTPS you will possibly need this option. What CA certificates come bundled with C and are checked by default depends on the distribution you use. =back =head2 Plugin C =over 4 =item B I Hostname of the host running B. Defaults to B. Please note that IPv6 support has been disabled unless someone can confirm or decline that B can handle it. =item B I TCP-Port to connect to. Defaults to B<3551>. =back =head2 Plugin C This plugin collects information about an Ascent server, a free server for the "World of Warcraft" game. This plugin gathers the information by fetching the XML status page using C and parses it using C. The configuration options are the same as for the C plugin above: =over 4 =item B I Sets the URL of the XML status output. =item B I Optional user name needed for authentication. =item B I Optional password needed for authentication. =item B B Enable or disable peer SSL certificate verification. See L for details. Enabled by default. =item B B Enable or disable peer host name verification. If enabled, the plugin checks if the C or a C field of the SSL certificate matches the host name provided by the B option. If this identity check fails, the connection is aborted. Obviously, only works when connecting to a SSL enabled server. Enabled by default. =item B I File that holds one or more SSL certificates. If you want to use HTTPS you will possibly need this option. What CA certificates come bundled with C and are checked by default depends on the distribution you use. =back =head2 Plugin C This plugin doesn't have any options. It reads F (for the first CPU installed) to get the current CPU frequency. If this file does not exist make sure B (L) or a similar tool is installed and an "cpu governor" (that's a kernel module) is loaded. =head2 Plugin C =over 4 =item B I Set the directory to store CSV-files under. Per default CSV-files are generated beneath the daemon's working directory, i.Ee. the B. =item B B If set to B, convert counter values to rates. If set to B (the default) counter values are stored as is, i.Ee. as an increasing integer number. =back =head2 Plugin C =over 4 =item B I Select partitions based on the devicename. =item B I Select partitions based on the mountpoint. =item B I Select partitions based on the filesystem type. =item B I|I Invert the selection: If set to true, all partitions B the ones that match any one of the criteria are collected. By default only selected partitions are collected if a selection is made. If no selection is configured at all, B partitions are selected. =back =head2 Plugin C The C plugin collects information about the usage of physical disks and logical disks (partitions). Values collected are the number of octets written to and read from a disk or partition, the number of read/write operations issued to the disk and a rather complex "time" it took for these commands to be issued. Using the following two options you can ignore some disks or configure the collection only of specific disks. =over 4 =item B I Select the disk I. Whether it is collected or ignored depends on the B setting, see below. As with other plugins that use the daemon's ignorelist functionality, a string that starts and ends with a slash is interpreted as a regular expression. Examples: Disk "sdd" Disk "/hda[34]/" =item B B|B Sets whether selected disks, i.Ee. the ones matches by any of the B statements, are ignored or if all other disks are ignored. The behavior (hopefully) is intuitive: If no B option is configured, all disks are collected. If at least one B option is given and no B or set to B, B matching disks will be collected. If B is set to B, all disks are collected B the ones matched. =back =head2 Plugin C =over 4 =item B I The dns plugin uses B to capture dns traffic and analyses it. This option sets the interface that should be used. If this option is not set, or set to "any", the plugin will try to get packets from B interfaces. This may not work on certain platforms, such as MacEOSEX. =item B I Ignore packets that originate from this address. =back =head2 Plugin C =over 4 =item B I Sets the socket-file which is to be created. =item B I If running as root change the group of the UNIX-socket after it has been created. Defaults to B. =item B I Change the file permissions of the UNIX-socket after it has been created. The permissions must be given as a numeric, octal value as you would pass to L. Defaults to B<0770>. =item B I Sets the maximum number of connections that can be handled in parallel. Since this many threads will be started immediately setting this to a very high value will waste valuable resources. Defaults to B<5> and will be forced to be at most B<16384> to prevent typos and dumb mistakes. =back =head2 Plugin C Please make sure to read L before using this plugin. It contains valuable information on when the executable is executed and the output that is expected from it. =over 4 =item B I[:[I]] I [IargE> [IargE> ...]] =item B I[:[I]] I [IargE> [IargE> ...]] Execute the executable I as user I. If the user name is followed by a colon and a group name, the effective group is set to that group. The real group and saved-set group will be set to the default group of that user. If no group is given the effective group ID will be the same as the real group ID. Please note that in order to change the user and/or group the daemon needs superuser privileges. If the daemon is run as an unprivileged user you must specify the same user/group here. If the daemon is run with superuser privileges, you must supply a non-root user here. The executable may be followed by optional arguments that are passed to the program. Please note that due to the configuration parsing numbers and boolean values may be changed. If you want to be absolutely sure that something is passed as-is please enclose it in quotes. The B and B statements change the semantics of the programs executed, i.Ee. the data passed to them and the response expected from them. This is documented in great detail in L. =back =head2 Plugin C The C plugin counts the number of files in a certain directory (and its subdirectories) and their combined size. The configuration is very straight forward: Instance "qmail-message" Instance "qmail-todo" Instance "php5-sessions" Name "sess_*" The example above counts the number of files in QMail's queue directories and the number of PHP5 sessions. Jfiy: The "todo" queue holds the messages that QMail has not yet looked at, the "message" queue holds the messages that were classified into "local" and "remote". As you can see, the configuration consists of one or more C blocks, each of which specifies a directory in which to count the files. Within those blocks, the following options are recognized: =over 4 =item B I Sets the plugin instance to I. That instance name must be unique, but it's your responsibility, the plugin doesn't check for that. If not given, the instance is set to the directory name with all slashes replaced by underscores and all leading underscores removed. =item B I Only count files that match I, where I is a shell-like wildcard as understood by L. Only the B is checked against the pattern, not the entire path. In case this makes it easier for you: This option has been named after the B<-name> parameter to L. =item B I Count only files of a specific age: If I is greater than zero, only files that haven't been touched in the last I seconds are counted. If I is a negative number, this is inversed. For example, if B<-60> is specified, only files that have been modified in the last minute will be counted. The number can also be followed by a "multiplier" to easily specify a larger timespan. When given in this notation, the argument must in quoted, i.Ee. must be passed as string. So the B<-60> could also be written as B<"-1m"> (one minute). Valid multipliers are C (second), C (minute), C (hour), C (day), C (week), and C (year). There is no "month" multiplier. You can also specify fractional numbers, e.Eg. B<"0.5d"> is identical to B<"12h">. =item B I Count only files of a specific size. When I is a positive number, only files that are at least this big are counted. If I is a negative number, this is inversed, i.Ee. only files smaller than the absolute value of I are counted. As with the B option, a "multiplier" may be added. For a detailed description see above. Valid multipliers here are C (byte), C (kilobyte), C (megabyte), C (gigabyte), C (terabyte), and C

(petabyte). Please note that there are 1000 bytes in a kilobyte, not 1024. =back =head2 Plugin C To get values from B collectd connects to B (127.0.0.1), port B<7634/tcp>. The B and B options can be used to change these default values, see below. C has to be running to work correctly. If C is not running timeouts may appear which may interfere with other statistics.. The B homepage can be found at L. =over 4 =item B I Hostname to connect to. Defaults to B<127.0.0.1>. =item B I TCP-Port to connect to. Defaults to B<7634>. =item B I|I If enabled, translate the disk names to major/minor device numbers (e.Eg. "8-0" for /dev/sda). For backwards compatibility this defaults to I but it's recommended to disable it as it will probably be removed in the next major version. =back =head2 Plugin C =over 4 =item B I Select this interface. By default these interfaces will then be collected. For a more detailed description see B below. =item B I|I If no configuration if given, the B-plugin will collect data from all interfaces. This may not be practical, especially for loopback- and similar interfaces. Thus, you can use the B-option to pick the interfaces you're interested in. Sometimes, however, it's easier/preferred to collect all interfaces I a few ones. This option enables you to do that: By setting B to I the effect of B is inverted: All selected interfaces are ignored and all other interfaces are collected. =back =head2 Plugin C =over 4 =item B I Selects sensors to collect or to ignore, depending on B. =item B I|I If no configuration if given, the B plugin will collect data from all sensors found of type "temperature", "voltage", "current" and "fanspeed". This option enables you to do that: By setting B to I the effect of B is inverted: All selected sensors are ignored and all other sensors are collected. =item B I|I If a sensor appears after initialization time of a minute a notification is sent. =item B I|I If a sensor disappears a notification is sent. =item B I|I If you have for example dual power supply and one of them is (un)plugged then a notification is sent. =back =head2 Plugin C =over 4 =item B I I [I [I]] Select the rules to count. If only I
and I are given, this plugin will collect the counters of all rules which have a comment-match. The comment is then used as type-instance. If I or I is given, only the rule with the matching comment or the Ith rule will be collected. Again, the comment (or the number) will be used as the type-instance. If I is supplied, it will be used as the type-instance instead of the comment or the number. =back =head2 Plugin C =over 4 =item B I Select this irq. By default these irqs will then be collected. For a more detailed description see B below. =item B I|I If no configuration if given, the B-plugin will collect data from all irqs. This may not be practical, especially if no interrupts happen. Thus, you can use the B-option to pick the interrupt you're interested in. Sometimes, however, it's easier/preferred to collect all interrupts I a few ones. This option enables you to do that: By setting B to I the effect of B is inverted: All selected interrupts are ignored and all other interrupts are collected. =back =head2 Plugin C This plugin allows CPU, disk and network load to be collected for virtualized guests on the machine. This means that these characteristics can be collected for guest systems without installing any software on them - collectd only runs on the hosting system. The statistics are collected through libvirt (L). Only I is required. =over 4 =item B I Connect to the hypervisor given by I. For example if using Xen use: Connection "xen:///" Details which URIs allowed are given at L. =item B I Refresh the list of domains and devices every I. The default is 60 seconds. Setting this to be the same or smaller than the I will cause the list of domains and devices to be refreshed on every iteration. Refreshing the devices in particular is quite a costly operation, so if your virtualization setup is static you might consider increasing this. If this option is set to 0, refreshing is disabled completely. =item B I =item B I =item B I =item B I|I Select which domains and devices are collected. If I is not given or I then only the listed domains and disk/network devices are collected. If I is I then the test is reversed and the listed domains and disk/network devices are ignored, while the rest are collected. The domain name and device names may use a regular expression, if the name is surrounded by I and collectd was compiled with support for regexps. The default is to collect statistics for all domains and all their devices. Example: BlockDevice "/:hdb/" IgnoreSelected "true" Ignore all I devices on any domain, but other block devices (eg. I) will be collected. =item B B When the libvirt plugin logs data, it sets the hostname of the collected data according to this setting. The default is to use the guest name as provided by the hypervisor, which is equal to setting B. B means use the guest's UUID. This is useful if you want to track the same guest across migrations. B means to use the global B setting, which is probably not useful on its own because all guests will appear to have the same name. You can also specify combinations of these fields. For example B means to concatenate the guest name and UUID (with a literal colon character between, thus I<"foo:1234-1234-1234-1234">). =back =head2 Plugin C =over 4 =item B B Sets the log-level. If, for example, set to B, then all events with severity B, B, or B will be written to the logfile. Please note that B is only available if collectd has been compiled with debugging support. =item B I Sets the file to write log messages to. The special strings B and B can be used to write to the standard output and standard error channels, respectively. This, of course, only makes much sense when collectd is running in foreground- or non-daemon-mode. =item B B|B Prefix all lines printed by the current time. Defaults to B. =back =head2 Plugin C The C uses mbmon to retrieve temperature, voltage, etc. Be default collectd connects to B (127.0.0.1), port B<411/tcp>. The B and B options can be used to change these values, see below. C has to be running to work correctly. If C is not running timeouts may appear which may interfere with other statistics.. C must be run with the -r option ("print TAG and Value format"); Debian's F script already does this, other people will need to ensure that this is the case. =over 4 =item B I Hostname to connect to. Defaults to B<127.0.0.1>. =item B I TCP-Port to connect to. Defaults to B<411>. =back =head2 Plugin C The C connects to a memcached server and queries statistics about cache utilization, memory and bandwidth used. L =over 4 =item B I Hostname to connect to. Defaults to B<127.0.0.1>. =item B I TCP-Port to connect to. Defaults to B<11211>. =back =head2 Plugin C The C requires B to be installed. It connects to the database when started and keeps the connection up as long as possible. When the connection is interrupted for whatever reason it will try to re-connect. The plugin will complaint loudly in case anything goes wrong. This plugin issues the MySQL C command and collects information about MySQL network traffic, executed statements, requests, the query cache and threads by evaluating the C, C, C, C and C return values. Please refer to the B, I<5.1.6. Server Status Variables> for an explanation of these values. Use the following options to configure the plugin: =over 4 =item B I Hostname of the database server. Defaults to B. =item B I Username to use when connecting to the database. The user does not have to be granted any privileges (which is synonym to granting the C privilege). Any existing MySQL user will do. =item B I Password needed to log into the database. =item B I Select this database. Defaults to I which is a perfectly reasonable option for what this plugin does. =back =head2 Plugin C The C plugin uses a netlink socket to query the Linux kernel about statistics of various interface and routing aspects. =over 4 =item B I =item B I Instruct the plugin to collect interface statistics. This is basically the same as the statistics provided by the C plugin (see above) but potentially much more detailed. When configuring with B only the basic statistics will be collected, namely octets, packets, and errors. These statistics are collected by the C plugin, too, so using both at the same time is no benefit. When configured with B all counters B the basic ones, so that no data needs to be collected twice if you use the C plugin. This includes dropped packets, received multicast packets, collisions and a whole zoo of differentiated RX and TX errors. You can try the following command to get an idea of what awaits you: ip -s -s link list If I is B, all interfaces will be selected. =item B I [I] =item B I [I] =item B I [I] Collect the octets and packets that pass a certain qdisc, class or filter. QDiscs and classes are identified by their type and handle (or classid). Filters don't necessarily have a handle, therefore the parent's handle is used. The notation used in collectd differs from that used in tc(1) in that it doesn't skip the major or minor number if it's zero and doesn't print special ids by their name. So, for example, a qdisc may be identified by C even though the minor number of B qdiscs is zero and thus not displayed by tc(1). If B, B, or B is given without the second argument, i.E.e. without an identifier, all qdiscs, classes, or filters that are associated with that interface will be collected. Since a filter itself doesn't necessarily have a handle, the parent's handle is used. This may lead to problems when more than one filter is attached to a qdisc or class. This isn't nice, but we don't know how this could be done any better. If you have a idea, please don't hesitate to tell us. As with the B option you can specify B as the interface, meaning all interfaces. Here are some examples to help you understand the above text more easily: VerboseInterface "All" QDisc "eth0" "pfifo_fast-1:0" QDisc "ppp0" Class "ppp0" "htb-1:10" Filter "ppp0" "u32-1:0" =item B The behaviour is the same as with all other similar plugins: If nothing is selected at all, everything is collected. If some things are selected using the options described above, only these statistics are collected. If you set B to B, this behavior is inverted, i.Ee. the specified statistics will not be collected. =back =head2 Plugin C =over 4 =item B I [I] =item B I [I] The B statement sets the server to send datagrams B. The statement may occur multiple times to send each datagram to multiple destinations. The B statement sets the interfaces to bind to. When multiple statements are found the daemon will bind to multiple interfaces. The argument I may be a hostname, an IPv4 address or an IPv6 address. If the argument is a multicast address the daemon will join that multicast group. If no B statement is found the server tries join both, the default IPv6 multicast group and the default IPv4 multicast group. If no B statement is found the client will try to send data to the IPv6 multicast group first. If that fails the client will try the IPv4 multicast group. The default IPv6 multicast group is C. The default IPv4 multicast group is C<239.192.74.66>. The optional I argument sets the port to use. It can either be given using a numeric port number or a service name. If the argument is omitted the default port B<25826> is assumed. =item B I<1-255> Set the time-to-live of sent packets. This applies to all, unicast and multicast, and IPv4 and IPv6 packets. The default is to not change this value. That means that multicast packets will be sent with a TTL of C<1> (one) on most operating systems. =item B I If set to I, write packets that were received via the network plugin to the sending sockets. This should only be activated when the B- and B-statements differ. Otherwise packets may be send multiple times to the same multicast group. While this results in more network traffic than necessary it's not a huge problem since the plugin has a duplicate detection, so the values will not loop. =item B I For each host/plugin/type combination the C caches the time of the last value being sent or received. Every I seconds the plugin searches and removes all entries that are older than I seconds, thus freeing the unused memory again. Since this process is somewhat expensive and normally doesn't do much, this value should not be too small. The default is 1800 seconds, but setting this to 86400 seconds (one day) will not do much harm either. =back =head2 Plugin C This plugin collects the number of connections and requests handled by the C (speak: engineEX), a HTTP and mail server/proxy. It queries the page provided by the C module, which isn't compiled by default. Please refer to L for more information on how to compile and configure nginx and this module. The following options are accepted by the C: =over 4 =item B I Sets the URL of the C output. =item B I Optional user name needed for authentication. =item B I Optional password needed for authentication. =item B B Enable or disable peer SSL certificate verification. See L for details. Enabled by default. =item B B Enable or disable peer host name verification. If enabled, the plugin checks if the C or a C field of the SSL certificate matches the host name provided by the B option. If this identity check fails, the connection is aborted. Obviously, only works when connecting to a SSL enabled server. Enabled by default. =item B I File that holds one or more SSL certificates. If you want to use HTTPS you will possibly need this option. What CA certificates come bundled with C and are checked by default depends on the distribution you use. =back =head2 Plugin C This plugin sends a desktop notification to a notification daemon, as defined in the Desktop Notification Specification. To actually display the notifications, B is required and B has to be able to access the X server. The Desktop Notification Specification can be found at L. =over 4 =item B I =item B I =item B I Set the I, in milliseconds, after which to expire the notification for C, C and C severities respectively. If zero has been specified, the displayed notification will not be closed at all - the user has to do so herself. These options default to 5000. If a negative number has been specified, the default is used as well. =back =head2 Plugin C The I plugin uses the I library to send notifications to a configured email address. I is available from L. Available configuration options: =over 4 =item B I
Email address from which the emails should appear to come from. Default: C =item B I
Configures the email address(es) to which the notifications should be mailed. May be repeated to send notifications to multiple addresses. At least one B must be present for the plugin to work correctly. =item B I Hostname of the SMTP server to connect to. Default: C =item B I TCP port to connect to. Default: C<25> =item B I Username for ASMTP authentication. Optional. =item B I Password for ASMTP authentication. Optional. =item B I Subject-template to use when sending emails. There must be exactly two string-placeholders in the subject, given in the standard I syntax, i.Ee. C<%s>. The first will be replaced with the severity, the second with the hostname. Default: C =back =head2 Plugin C =over 4 =item B I Hostname of the host running B. Defaults to B. =item B I UDP-Port to connect to. Defaults to B<123>. =item B B|B Sets wether or not to perform reverse lookups on peers. Since the name or IP-address may be used in a filename it is recommended to disable reverse lookups. The default is to do reverse lookups to preserve backwards compatibility, though. =back =head2 Plugin C =over 4 =item B IB<@>I[B<:>I] Add a UPS to collect data from. The format is identical to the one accepted by L. =back =head2 Plugin C B See notes below. The C plugin uses the B library from the B project L to read sensors connected via the onewire bus. Currently only temperature sensors (sensors with the family code C<10>, e.Eg. DS1820, DS18S20, DS1920) can be read. If you have other sensors you would like to have included, please send a sort request to the mailing list. Hubs (the DS2409 chips) are working, but read the note, why this plugin is experimental, below. =over 4 =item B I Sets the device to read the values from. This can either be a "real" hardware device, such as a serial port or an USB port, or the address of the L socket, usually B. Though the documentation claims to automatically recognize the given address format, with versionE2.7p4 we had to specify the type explicitly. So with that version, the following configuration worked for us: Device "-s localhost:4304" This directive is B and does not have a default value. =item B I Selects sensors to collect or to ignore, depending on B, see below. Sensors are specified without the family byte at the beginning, to you'd use C, and B include the leading C<10.> family byte and point. =item B I|I If no configuration if given, the B plugin will collect data from all sensors found. This may not be practical, especially if sensors are added and removed regularly. Sometimes, however, it's easier/preferred to collect only specific sensors or all sensors I a few specified ones. This option enables you to do that: By setting B to I the effect of B is inverted: All selected interfaces are ignored and all other interfaces are collected. =back B The C plugin is experimental, because it doesn't yet work with big setups. It works with one sensor being attached to one controller, but as soon as you throw in a couple more senors and maybe a hub or two, reading all values will take more than ten seconds (the default interval). We will probably add some separate thread for reading the sensors and some cache or something like that, but it's not done yet. We will try to maintain backwards compatibility in the future, but we can't probmise. So in short: If it works for you: Great! But kaap in mind that the config I change, though this is unlikely. Oh, and if you want to help improving this plugin, just send a short notice to the mailing list. ThanksE:) =head2 Plugin C This plugin embeds a Perl-interpreter into collectd and provides an interface to collectd's plugin system. See L for its documentation. =head2 Plugin C =over 4 =item B I Host to ping periodically. This option may be repeated several times to ping multiple hosts. =item B I<0-255> Sets the Time-To-Live of generated ICMP packets. =back =head2 Plugin C The C plugin queries statistics from PostgreSQL databases. It keeps a persistent connection to all configured databases and tries to reconnect if the connection has been interrupted. A database is configured by specifying a B block as described below. The default statistics are collected from PostgreSQL's B which thus has to be enabled for this plugin to work correctly. This should usually be the case by default. See the section "The Statistics Collector" of the B for details. By specifying custom database queries using a B block as described below, you may collect any data that is available from some PostgreSQL database. This way, you are able to access statistics of external daemons which are available in a PostgreSQL database or use future or special statistics provided by PostgreSQL without the need to upgrade your collectd installation. The B manual can be found at L. Query "SELECT magic, spells FROM wizard WHERE host = $1;" Param hostname Column gauge magic Column counter spells Host "hostname" Port "5432" User "username" Password "secret" SSLMode "prefer" KRBSrvName "kerberos_service_name" Query magic Service "service_name" The B block defines one database query which may later be used by a database definition. It accepts a single mandatory argument which specifies the name of the query. The names of all queries have to be unique. The following configuration options are available to define the query: =over 4 =item B I Specify the I which the plugin should execute. The string may contain the tokens B<$1>, B<$2>, etc. which are used to reference the first, second, etc. parameter. The value of the parameters is specified by the B configuration option - see below for details. To include a literal B<$> character followed by a number, surround it with single quotes (B<'>). Any SQL command which may return data (such as C