While HA can be a great thing I've always been of the opinion that a
monitoring setup needs to have as few moving parts as possible. The more
complexity to the monitor, the more chance you'll be chasing monitoring
issues rather than site issues. And everthing you add on top of the
monitor also needs to be monitored. So somehow that F5 is going to need an
out-of-band monitor because if it dies then your Nagios host may well not
have a way to contact you about it unless you've dual homed it which
brings up a whole other set of issues.
The closest I got to HA at my last gig was creating a CNAME for the active
Nagios host so in a failover you point the CNAME to the new box and at
least passive checks can still roll in (after DNS timeout of course, which
I say is better than reconfiging every NSCA clent).
-f
On Thu, 9 May 2013, Steve Shipway wrote:
Date: Thu, 9 May 2013 09:19:17 +0000
From: Steve Shipway <s.ship...@auckland.ac.nz>
Reply-To: Nagios Users List <nagios-users@lists.sourceforge.net>
To: "nagios-users@lists.sourceforge.net" <nagios-users@lists.sourceforge.net>
Subject: [Nagios-users] High Availabilty with Nagios
Does anyone have an HA setup for Nagios that works?
I'm thinking of creating a NEB module that will link two Nagios setups, and
replicate over all
status changes, config changes, downtime, comments, etc etc and then set the
'standby' Nagios to
be checks/notifications disabled when in standby mode, and enabled when in
active mode. Then
put the two behind a failover load balancer (F5, Foundry or apache reverse
proxy).
However this would be too much work if someone else has already found an
equivalent solution.
I've looked at Merlin but it doesn't seem to do what I'm after (and the
documentation is
practically nonexistant - much the same as the NEB API documentation, in fact).
Mod_gearman
lets me have redundant checks and replicate *active* checks, but not commands,
downtime or
passive checks.
Does anyone out there have a workable way to get an active/standby or
active/active Nagios
setup? Would be interested in hearing all ideas...
Steve
Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.ship...@auckland.ac.nz
Ph: +64 9 373 7599 ext 86487
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