How to fix Munin’s MySQL Graph on cPanel

words by Brian Racer

We have a few cPanel servers deployed and to visually monitor performance we use the Munin monitoring tool. We were having issues where the MySQL graphs would stop updating. The bug has to do with one of the perl libraries the script uses, which causes the MySQL plugin to have problems location the mysqladmin program.

To fix these, create or edit the following file:

vi /etc/munin/plugin-conf.d/cpanel.conf

It should contain the following:

[mysql*]
user root
group wheel
env.mysqladmin /usr/bin/mysqladmin
env.mysqlopts --defaults-extra-file=/root/.my.cnf

This would load the username and password from root’s mysql config. If that file doesn’t exist you can create it:

sudo vi /root/.my.cnf
[client]
user="root"
pass="secret!password"

Now just restart Munin, wait a a little bit, and the graphs should start populating again!

sudo /etc/init.d/munin-node restart