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Collectd::Unixsock(3pm) User Contributed Perl Documentation Collectd::Unixsock(3pm)


Collectd::Unixsock - Abstraction layer for accessing the functionality by collectd's unixsock plugin.


  use Collectd::Unixsock;

  my $sock = Collectd::Unixsock->new ($path);

  my $value = $sock->getval (%identifier);
  $sock->putval (%identifier,
                 time => time (),
                 values => [123, 234, 345]);

  $sock->destroy ();


collectd's unixsock plugin allows external programs to access the values it has collected or received and to submit own values. This Perl-module is simply a little abstraction layer over this interface to make it even easier for programmers to interact with the daemon.


The values in the collectd are identified using a five-tuple (host, plugin, plugin-instance, type, type-instance) where only plugin instance and type instance may be undef. Many functions expect an %identifier hash that has at least the members host, plugin, and type, possibly completed by plugin_instance and type_instance.

Usually you can pass this hash as follows:

  $self->method (host => $host, plugin => $plugin, type => $type, %other_args);


$self = Collectd::Unixsock->new ([$path]);
Creates a new connection to the daemon. The optional $path argument gives the path to the UNIX socket of the "unixsock plugin" and defaults to /var/run/collectd-unixsock. Returns the newly created object on success and false on error.
$res = $self->getval (%identifier);
Requests a value-list from the daemon. On success a hash-ref is returned with the name of each data-source as the key and the according value as, well, the value. On error false is returned.
$res = $self->getthreshold (%identifier );
Requests a threshold from the daemon. On success a hash-ref is returned with the threshold data. On error false is returned.
$self->putval (%identifier, time => $time, values => [...]);
Submits a value-list to the daemon. If the time argument is omitted "time()" is used. The required argument values is a reference to an array of values that is to be submitted. The number of values must match the number of values expected for the given type (see "VALUE IDENTIFIERS"), though this is checked by the daemon, not the Perl module. Also, gauge data-sources (e. g. system-load) may be "undef". Returns true upon success and false otherwise.
$res = $self->listval_filter ( %identifier )
Queries a list of values from the daemon while restricting the results to certain hosts, plugins etc. The argument may be anything that passes for an identifier (cf. "VALUE IDENTIFIERS"), although all fields are optional. The returned data is in the same format as from "listval".
$res = $self->listval ()
Queries a list of values from the daemon. The list is returned as an array of hash references, where each hash reference is a valid identifier. The "time" member of each hash holds the epoch value of the last update of that value.
$res = $self->putnotif (severity => $severity, message => $message, ...);
Submits a notification to the daemon.

Valid options are:

Sets the severity of the notification. The value must be one of the following strings: "failure", "warning", or "okay". Case does not matter. This option is mandatory.
Sets the message of the notification. This option is mandatory.
Sets the time. If omitted, "time()" is used.
Value identifier
All the other fields of the value identifiers, host, plugin, plugin_instance, type, and type_instance, are optional. When given, the notification is associated with the performance data of that identifier. For more details, please see collectd-unixsock(5).
$self->flush (timeout => $timeout, plugins => [...], identifier => [...]);
Flush cached data.

Valid options are:

If this option is specified, only data older than $timeout seconds is flushed.
If this option is specified, only the selected plugins will be flushed. The argument is a reference to an array of strings.
If this option is specified, only the given identifier(s) will be flushed. The argument is a reference to an array of identifiers. Identifiers, in this case, are hash references and have the members as outlined in "VALUE IDENTIFIERS".
$self->destroy ();
Closes the socket before the object is destroyed. This function is also automatically called then the object goes out of scope.


collectd(1), collectd.conf(5), collectd-unixsock(5)


Florian octo Forster <>
2021-07-14 perl v5.32.1