multiple nagios monitoring that have to agree?

[Marc Powell]

> -----Original Message-----
> From: nagios-users-admin at lists.sourceforge.net [mailto:nagios-users-
> admin at lists.sourceforge.net] On Behalf Of Philip Hallstrom
> Sent: Wednesday, March 29, 2006 3:54 PM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] multiple nagios monitoring that have to agree?
> 
> I've read through the docs and distributed, failover, and redundant
> monitoring, but those didn't seem to apply.
> 
> I'm wondering if two nagios instances can be set up to monitor the
> same hosts/services and have to agree with each other before sending a
> notification?

That's not a standard configuration and you'd probably run into timing
issues. If NagiosA has checked the service and finds it down, NagiosB
may not have checked the service yet and may still consider it up. What
do you do then (nothing?)? How can you tell the difference (Last Check
time?)? Nagios isn't built for that kind of coordination.

For an off-the-cuff suggestion, if you used multiple retries and didn't
specifically require that both servers see the state as HARD you could
embed that logic in your notification script.

- NagiosA always sends notifications.
- ServiceX on HostY reaches hard state.
- NagiosA initiates notification for ServiceX on HostY
- Notification script searches status.log on NagiosB or performs HTTP
screen scrape on NagiosB to determine state of ServiceX on HostY as seen
from there.
- If NagiosB shows CRITICAL, send notification
- If only one shows critical do nothing(?)
- repeat at regular intervals in case NagiosB was slow to pick up the
state (or use the vice-versa logic to also send notifications from
NagiosB)


There are probably pitfalls but I think that's how I would approach it
at first.

--
Marc


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