Munin: MySQL InnoDB free tablespace WARN

Because of the fact that Munin by default throws a warning at 2GB free tablespace and a critical alert at 1GB free tablespace, you will probably get a permanent Munin warning for MySQL InnoDB free tablespace. MySQL will by default create a 10MB autoexpanding tablespace, which autoextends as needed, thus this warning should be disregarded.

A simple fix is to disable the alerts. For this, create the following file:

nano /etc/munin/plugin-conf.d/mysql_innodb

paste the following code:

env.warning 0
env.critical 0

and restart munin-node:

/etc/init.d/munin-node restart
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