MySQL Related Nagios Plugins

After seeing Frank’s script in “Finding out how far behind are slaves” I figured I would post some nagios plugins I wrote a while ago, that we use at our company. They’re already up at, the 3rd party repository for nagios plugins.

So I figured I’d point you to:
Replication Lag Time
InnoDB Free Space

I’ll note that backups from a slave server can cause replication lag time to fall behind, for 2 reasons — mysqldump falls under “heavy SELECTs” as Frank has mentioned, but also zipping up logs or general high load/high CPU usage on a server can also cause the database to fall behind, because less CPU time is given to MySQL.

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