Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

First launched in 1999, Nagios has grown to include thousands of projects developed by the worldwide Nagios community. Nagios is officially sponsored by Nagios Enterprises, which supports the community in a number of different ways through sales of its commercial products and services.

http://www.nagios.org/about

For each command, append HOSTS=target.host.name

Install Nagios server

cap deprec:nagios:install
cap deprec:nagios:gen_host # One way to add hosts to monitor
cap deprec:nagios:config

Configure clients to accept requests

cap deprec:nrpe:install
cap deprec:nrpe:test_local  # does nrpe query from local host
cap deprec:nrpe:test_remote # does nrpe query from nagios server