"apache" plugin

The "apache" plugin queries the page generated by mod_status, parses it and submits the number of bytes transfered, the number of requests received, and the number of processes in the various states of the scoreboard.

The plugin uses libcurl to connect to the webserver, optionally using a configured username/password to authenticate. It tries to keep a keep-alive connection open to minimize the overhead of connecting to the server. It's also possible to query hosts over SSL.

Details of the configuration can be found in the collectd.conf(5) manpage.

Data sources

apache/apache_bytes.rrd

I'm very sorry, but I currently don't know if this is incoming traffic, outgoing traffic or both combined.

count (counter, min 0, max 2²⁷)

Traffic handeled/served by the Apache webserver.

apache/apache_requests.rrd

count (counter, min 0, max 2²⁰)

Requests served by the Apache webserver.

apache/apache_scoreboard-instance.rrd

This file contains information about "process slots" in various modes. A "process slot" is a data structure within the webserver and not neccessarily a running process. The actual modes may depend on the MPM being used.

count (gauge, min 0)

Number of process slots in the specified mode.

Filename

Example graph

Dependencies

• Apache Webserver with mod_status
• lighttpd with mod_status (of course this is an alternative to the Apache Webserver)
• libcurl