Design question

[Sean McAfee]

Michael Weiner wrote:
> My only question after reading the redundant network monitoring
> documentation is, how to do a remote check on the nagios process? Can
> this be wrapped in nrpe?
> 
> Thanks

Exactly that - slaves monitor the master (and vice-versa) via a 
nrpe-wrapped check_nagios that checks /var/spool/nagios/nagios.log (runs 
every minute).  This is where the event handler is kicked off on any 
HARD state change.

Since any large-scale problem will result in moderate-to-severe latency 
as checks timeout and reschedule (especially if send_nsca is timing out 
on passive result submissions as well), there's also a cron job that 
runs every two minutes that basically does the same thing, just outside 
the guise of the actual Nagios daemon.

The only drawback is it can't self-demote (or you'd be spamming the 
external command file every time it runs).  Prompt self-promotion is the 
primary goal here, so some latency in self-demotion is perfectly 
acceptable since the only risk is receiving redundant notifications from 
each slave for any globally-monitored hosts.

Sean McAfee
System Engineer

Collaborative Fusion, Inc.
  smcafee at collaborativefusion.com
  412-422-3463 x 4025

5849 Forbes Avenue
Pittsburgh, PA 15217

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