nagios trigger an alert after installation

Bryan Hunt asked:

I’ve just done a bunch of Nagios installs. Now comes the time to test them. What I’d like to do first is just a quick sanity check to verify the install went correctly.

Is there a quick way to trigger a Nagios alert, with the default install, short of filling up the hard disk using dd or suchlike?

My answer:

Nagios (as shipped with the EPEL repository) comes with a sample configuration which monitors localhost out of the box, as soon as you service nagios start. If you’ve installed Nagios from EPEL on a RHEL (or clone) box, then it should already be giving you host and service status reports for localhost.

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