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TCPConns plugin
Type: read
Callbacks: config, init, read
Status: supported
First version: 4.2
Copyright: 2007–2008 Florian octo Forster
2008 Michael Stapelberg
License: GPLv2
BSD (revised)
Manpage: collectd.conf(5)
List of Plugins

The TCPConns plugin counts the number of TCP connections to or from a specified port. Typically the connections where you specify the local port are incoming connections while the connections where you specify the remote port are outgoing connections.


Single port

<Plugin "tcpconns">
  ListeningPorts false
  LocalPort "25"
  RemotePort "25"

Multiple ports

<Plugin "tcpconns">
  ListeningPorts false
  LocalPort "25"
  LocalPort "22"

All listening ports

<Plugin "tcpconns">
  ListeningPorts true

Summary of all ports

<Plugin "tcpconns">
  AllPortsSummary true

Example graphs

Plugin-tcpconns-local.png Plugin-tcpconns-remote.png


  • Linux
    • /proc-file system
  • Mac OS X (possibly also other *BSDs)
    • sysctlbyname(3)