Nagios check_ping times

[Marc Powell]

> -----Original Message-----
> From: nagios-users-admin at lists.sourceforge.net [mailto:nagios-users-
> admin at lists.sourceforge.net] On Behalf Of Reg
> Sent: Tuesday, January 10, 2006 11:19 PM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Nagios check_ping times
> 
> I sporadically ( 1 or 2 times/day for 50 hosts) get check_ping
returing
> average response times of 500ms plus resulting in false "critical"
> alerts from Nagios.  E.G.
> PING CRITICAL - Packet loss = 0%, RTA = 535.87 ms
> 
> I'm running Suse 9.1 on VMWare ESX server.  I DO NOT believe vmware to
> be a factor because I also run smokeping on this virtual machine.
> SmokePing sends 3 pings every 5 seconds to the same hosts and never
> shows the 500ms+ latency that Nagios reports.  During the course of a
> typical day I get 80-100 of these "false alarms"
> I suspect the problem is in the nagios daemon and how i have it
> configured.  When i run check_ping manually i can't reproduce the
> 500ms+.  Are there any quick tests or diagnostics to help figure
what's
> going on?

I have personally seen discrepancies between the results of fping tests
(which Smokeping uses) and ping tests (which check_ping uses), even to
the point where one works and the other doesn't. Though that last case
turned out to be a circuit issue, you might want to try using
check_fping to see if your problems go away. I can't imagine any
configuration that you could implement that would cause ping to falsely
report high latencies. 

Another thing you might want to check is the load on the server at those
times. If the load is abnormally high it might delay ping's processing
of the return results.

--
Marc


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