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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?

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up vote 3 down vote accepted

If it's just to test your alerts/escalations change the Critical threshold on (one of) your check(s) to something that will trigger a CRITICAL check result.

Alternatively use the check_dummy plugin (from the Nagios Plugins pack) and set it up to return a CRITICAL status, for example:


Other status codes you can return are:

0 - OK
1 - Warning
2 - Critical
3 - Unknown
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That's exactly what I was looking for, thanks Kev man. – Bryan Hunt Jul 24 '12 at 21:52
BOFH4EVR BOFH4EVR BOFH4EVR – Bryan Hunt Jul 24 '12 at 21:54

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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Just use iptables to block communication from your Nagios host to your target machine. Say you are looking at your web servers. Log on to one, and block port 80/443 traffic from you nagios box simulating an outage.

If localhost only, maybe remove the plugin or one of the plugin dependencies. Iptables may still help simulate a failure.

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You can send a test notification/alert from the web UI, but that really only tests that the notification command is able to send email.

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