FW: FW: secondary nagios verification

[Brian Smith]

Hi Miles.  See comment below...


> -----Original Message-----
> From: nagios-users-admin at lists.sourceforge.net [mailto:nagios-users- 
> admin at lists.sourceforge.net] On Behalf Of Chris Wilson
> Sent: Wednesday, July 27, 2005 8:35 AM
> To: Miles Scruggs
> Cc: Nagios Users
> Subject: Re: [Nagios-users] FW: secondary nagios verification
> 
> Hi Miles,
> 
> > Is there anyway for nagios to verify the status of a host from 
> > another nagios system?
> 
> Not exactly. Passive service checks might do it, but there is an 
> infinite loop issue between the two hosts if they are both set to 
> submit results to each other.
> 
> > If I have two nagios systems nag_A and nag_B  and they are 
> > monitoring the
> > host host_A and it's services.  If nag_A detects that host_A is down

> > is there anyway for it to ask nag_B if this is verifiable, and vice
> > versa.
> 
> You could submit a request for an immediate service check via HTTP, by

> scripting the web interface on nag_B and calling that from nag_A (and 
> vice versa).

Another way to do this, depending on your exact situation, might be to
make the Nagios XML files (on my system this is /var/nagios/nagios.xml)
on each machine viewable by the other machine.  If one machine sees the
service you're looking for go down, you could run a script that checks
the XML file on the other machine, and if it says OK it could manually
drop a service check response into the Nagios command file.

Or, you could define a separate service for that host on each Nagios
machine (like maybe othernagios_svcname), and have that service NOT
generate its own checks.  Then have a cronjob on each machine check the
XML file on the other machine (for the real service) to see if it says
OK or not.  So each Nagios would have two services for that host, one
for its own checks and one for the other machine's checks, and no
infinite loop because neither Nagios is set to send checks to the other,
it happens through a separate channel.

Try this you'll see what I mean:
cat nagios.xml |grep [specific host name]



Good luck,
-- Brian


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