If you're using MySQL replication, then you're probably counting on it for some fairly important need. Monitoring via something like Nagios is generally considered a best practice. This article assumes you've already got your Nagios server setup and your intention is to add a Ubuntu 10.04 NRPE client. This article also assumes the Ubuntu 10.04 NRPE client is your MySQL replication master, not the slave. The OS of the slave does not matter.
Getting the Nagios NRPE client setup on Ubuntu 10.04
At first it wasn't clear what packages would be appropriate packages to install. I was initially misled by the naming of the nrpe package, but I found the correct packages to be:
sudo apt-get install nagios-nrpe-server nagios-plugins
The NRPE configuration is stored in
/etc/nagios/nrpe.cfg, while the plugins are installed in