Redundancy (was: Need command to inhibit freshness checks)
Andreas Ericsson
ae at op5.se
Wed Feb 2 20:28:47 CET 2005
While we're on the topic of redundancy and such, I've got a couple of
questions to shoot off in shotgun mode. I'm especially interested in
hearing from nagios-db developers.
Situation; We're about to roll out a 20K+ nodes network monitoring
system (nagios world record?). While most of the nodes will be monitored
with standalone redundant system (30 desktop stations with a webbrowser
each and a 100 foot long multi-monitor wall), loadbalancing and
redundancy will still be an issue for the 4 global NOC's.
What's the general view of moving such code in-core, and have the nagios
daemon handle portioning of checks, synchronizing internal
status-tables, sending regular heartbeats and such?
If not in-core;
Could this be done with a nagios-module?
How much access do they have at loadtime/run-time?
Can they register to handle config file options?
Command line options?
Can they make things NOT happen (like logging to files)?
Just how stable is the module-handling code?
What impact could a misbehaving module have on the daemon as a whole?
Ethan Galstad wrote:
> Actually, they're already there... :-)
>
> ENABLE_SERVICE_FRESHNESS_CHECKS
> DISABLE_SERVICE_FRESHNESS_CHECKS
> ENABLE_HOST_FRESHNESS_CHECKS
> DISABLE_HOST_FRESHNESS_CHECKS
>
> These commands apply globally, so they should be what you're looking
> for.
>
>
> On 20 Jan 2005 at 8:28, Jason Martin wrote:
>
>
>>I've got a failover monitoring setup. One problem I'm having is
>>that some of my checks are freshness-based, and the standby
>>Nagios server is executing them even though all service checks
>>are disabled. May I suggest the addition of an external command
>>that allows globally inhibiting / enabling freshness checks?
>>
>>Thanks,
>>-Jason Martin
>>--
>>Words are not food, though sometimes we must eat them.
>>This message is PGP/MIME signed.
>>
>
>
>
>
> Ethan Galstad,
> Nagios Developer
> ---
> Email: nagios at nagios.org
> Website: http://www.nagios.org
>
>
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--
Andreas Ericsson andreas.ericsson at op5.se
OP5 AB www.op5.se
Lead Developer
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