pmdasockets(1) — Linux manual page


PMDASOCKETS(1)           General Commands Manual          PMDASOCKETS(1)

NAME         top

       pmdasockets - sockets statistics PMDA

DESCRIPTION         top

       pmdasockets is a Performance Metrics Domain Agent (PMDA) which
       exports metric values for current sockets on the local system.

       This PMDA currently collects its data through the ss(8) utility
       and requires that the program is installed in order to function.
       This dependency may change in the future.

INSTALLATION         top

       To install (enable) the sockets PMDA, do the following as root:

           # cd $PCP_PMDAS_DIR/sockets
           # ./Install

       To uninstall (disable), do the following as root:

           # cd $PCP_PMDAS_DIR/sockets
           # ./Remove

       pmdasockets is launched by pmcd(1) and should never be executed
       directly.  The Install and Remove scripts notify pmcd(1) when the
       agent is installed or removed.


       The string valued metric network.persocket.filter specifies the
       ss(1) filter to be applied to optionally select socket states, IP
       addresses and other options that pmdasockets will collect (to
       populate it's instance domain).  This is loaded on PMDA startup
       from the file $(PCP_SYSCONF_DIR)/sockets/filter.conf (typically
       /etc/pcp/sockets/filter.conf) and defaults to state connected
       meaning only sockets in the connected state will be included.
       This can be changed persistently by editing filter.conf as the
       root user.  The filter can also be changed dynamically after the
       PMDA has started by using pmstore(1) to store a new filter string
       in the network.persocket.filter metric.  E.g.

           # pmstore network.persocket.filter "state all"

       will change the filter to include sockets in all states.  Note a
       dynamically stored filter is not persisted across PMDA restarts
       or reboots (edit the config file for a persistent change).  For
       further details of the filter syntax and options, consult ss(8).


       The pmlogconf(1) configuration file for pmdasockets is
       $PCP_VAR_DIR/config/pmlogconf/networking/persocket-linux (where
       $PCP_VAR_DIR is typically /var/lib/pcp) which specifies to log
       all metrics below network.persocket in the PCP namespace with a
       default sampling interval of 60 seconds.  The logging interval
       and metrics to be logged can be changed by editing that file and
       then restarting the pmlogger service.  For details of the syntax,
       see pmlogconf(1).

METRICS         top

       The metrics and metadata supported by pmdasockets correspond to
       fields reported by ss -noemitauOH and are also available as help
       text provided by the PMDA, e.g. to list all metrics, metadata
       descriptors and help text:

           # pminfo -fmdtT network.persocket

       Note that the PMDA must be installed (enabled) for this command
       to work correctly, see above.


       Environment variables with the prefix PCP_ are used to
       parameterize the file and directory names used by PCP. On each
       installation, the file /etc/pcp.conf contains the local values
       for these variables.  The $PCP_CONF variable may be used to
       specify an alternative configuration file, as described in

SEE ALSO         top

       PCPIntro(1), pmcd(1), pmlogger(1) and ss(8).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       project's upstream Git repository
       ⟨⟩ on 2023-12-22.
       (At that time, the date of the most recent commit that was found
       in the repository was 2023-12-16.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Performance Co-Pilot               PCP                    PMDASOCKETS(1)

Pages that refer to this page: pcp-ss(1)