collectd-redis

Dropin replacement for the collectd Redis plugin using collectd Exec.

The collectd Redis Plugin submits wrong metrics when collectd runs with multithreading (see https://github.com/collectd/collectd/issues/3941). Multithreading is the default and is highly recommended to prevent plugins from blocking other plugins.

Configuration

Get the binary and place it on a server running collectd. Make it executable.

This plugin uses collectd Exec. So you need an exec configuration. Then you can setup several instances to be monitored. The following example shows how a Redis Plugin config can be replaced with the Exec setup:

Redis Plugin

<LoadPlugin redis>
  Globals false
</LoadPlugin>

<Plugin redis>
  <Node "caching">
    Host "localhost"
    Port "6379"
  </Node>
  <Node "queue">
    Host "localhost"
    Port "6380"
  </Node>
</Plugin>

Exec Plugin

<LoadPlugin exec>
  Globals false
</LoadPlugin>

<Plugin exec>
  Exec "collectd:collectd" "/opt/collectd/collectd-redis" "caching:localhost:6379"
  Exec "collectd:collectd" "/opt/collectd/collectd-redis" "queue:localhost:6380"
</Plugin>

Connection string

The plugin takes a connection string in the format <name>:<host/ip>:<port>[:<password>].

The password is optional and the part of the string in square bracktes is not required if the redis instances does not use password authentication.