[Nagiosplug-help] check_ssh causes target host to reboot?

Olaf Hoyer ohoyer at ohoyer.de
Fri Apr 23 10:23:06 CEST 2004

Hi there,

I have some strange issues with the check_ssh plugin:

Target host to be monitored is an appliance, running Linux 2.2 and
openssh 3.6.1p1 / 3.7.1p1.

The monitoring host is a FreeBSD 4.9-stable, nagios 1.2 and
nagios-plugins 1.3.1, all compiled from a recent ports collection.

Strange problem is, that the appliances (monitored about 11 of them)
will reboot without obvious cause every 1-2 days, with a check interval
of about 5 minutes.

In am attempt to verify this, I set up a script which triggers check_ssh
directly from the monitoring host to a specific target appliance, and
used an infinite loop, so that about 10 checks were made per second,
that appliance rebootet within 2 1/2 hours, and this value could be
reproduced reliably.

As I de-configured the check_ssh in nagios setup for all the other
boxes, I never had a reboot again, so I strongly assume that there are
coincidences happening, since those appliances easily reach 100 days

Kind regards
Olaf Hoyer

Olaf Hoyer        ohoyer at gaff.hhhr.ision.net
Fuerchterliche Erlebniss geben zu raten,
ob der, welcher sie erlebt, nicht etwas Fuerchterliches ist.
(Nietzsche, Jenseits von Gut und Boese)

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