Setting up Apache monitoring with Munin

07 October 2009 | Matt Perdeaux | , 

After a few solid days of Linux server wrangling, I found getting Munin to monitor our Apache server more hassle than I thought it would be.

Salient system details:

  • Ubuntu Hardy
  • Nginx web server (port 80) proxy
  • Apache web server (port 8080)

So, if only for my own future reference, here's how I managed it:

  1. Make sure the WWW Protocol library for Perl is installed:
    sudo apt-get install libwww-perl
  2. Apache needs to be running mod_status (which serves of the stats that Munin draws charts for). Add the following somewhere in /etc/apache2/apache2.conf:

    ExtendedStatus On
    <Location /server-status>
        SetHandler server-status
        Order deny,allow
        Deny from all
        Allow from 127.0.0.1
    </Location>
  3. Restart Apache:
    sudo /etc/init.d/apache2 restart
  4. The Munin plugins actually live in /usr/share/munin/plugins, and are symlinked to in /etc/munin/plugins:


    sudo ln -s /usr/share/munin/plugins/apache_accesses /etc/munin/plugins/apache_accesses
    sudo ln -s /usr/share/munin/plugins/apache_activity /etc/munin/plugins/apache_activity
    sudo ln -s /usr/share/munin/plugins/apache_processes /etc/munin/plugins/apache_processes
    sudo ln -s /usr/share/munin/plugins/apache_volume /etc/munin/plugins/apache_volume


    NB - If you have uploaded any additional plugins, ensure root has execute permission:
    sudo chmod 755 apache_activity
  5. Make sure the Munin plugins are monitoring port 8080 - in this setup I've got Nginx on the default port. Add the following to /etc/munin/plugin-conf.d/munin-node:

    [apache_*]
    env.ports 8080

  6. Restart the Munin node:
    sudo /etc/init.d/munin-node restart

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