Reloading configuration on-the-fly

[Andreas Ericsson]

On 07/01/2011 11:48 AM, Marc-André Doll wrote:
> Hi list,
> 
> I'm starting to have some big perimeter (well, probably not as big as
> some of yours) on a Nagios and it's starting to be quite delicate to
> restart/reload it as it takes between 6 and 10 minutes to start
> scheduling checks again.
> 
> Is there a way/module/tool to reload the configuration without those
> dead windows in my monitoring?
> 

First of all, make sure you're running a recent enough version of Nagios
to have Jean Gabès' patch for speeding up circular host/parent paths.

Secondly, precache the configuration before reloading and use the precached
version of the object config when doing the actual restart. This will bring
your downtime down from 6-10 minutes to perhaps 1-5 seconds. You'll still
lose the full 6-10 minutes for recently added objects, but the previously
existing ones will keep being monitored.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

Considering the successes of the wars on alcohol, poverty, drugs and
terror, I think we should give some serious thought to declaring war
on peace.

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