Antwort: Re: Antwort: Re: Check becomes unplanned

Anthony Montibello amontibello at gmail.com
Sat Sep 13 02:15:57 CEST 2008


quick question: would the following be a configuration workaround to the
rescheduling next year issue or would it induce other problems?

Setup the check interval to 24*7
then change the notification interval to the a limited timeinterval
also setup the host or service (based on situation) to downtime for time
intervals you do not want to be notified ..

TOny

On Fri, Sep 12, 2008 at 3:56 AM, <Sascha.Runschke at gfkl.com> wrote:

>
> nagios-devel-bounces at lists.sourceforge.net schrieb am 11.09.2008 20:53:18:
>
>
> > So although this is a bug, I wouldn't expect Nagios to work very well
> > with time shifts and there's many other applications/daemons out there
> > that could fail as well. You shouldn't have to constantly re-adjust the
> > clock - if you do then there might me a bigger problem...
>
> Of course it's a problem rooted somewhere deeper in the environment,
> yet I don't think programs should suffer from it.
>
> > Have you tried running an ntp daemon? It should try keeping the clock
> > sync without causing time shifts (as Andreas explained, it slows down or
> > speed up the clock instead). What OS is it on? under a VM? custom
> > compiled kernel? There might be something broken or unsupported in your
> > setup that causes this. If you don't fix it you shouldn't expect your
> > system to work very well anyway.
>
> Running ntpd won't help at all. The timeshifts happen because the
> systemclock is running too fast. It doesn't really matter if you
> adjust it back in little ticks or in one big bang once a day.
> You can easily reproduce this with running an older 2.6 kernel
> inside a VM using the clocksource=pit kernelparameter. The systemclock
> will be running 1 jitter too fast, resulting in 1 sec backshift like
> every 5 minutes - either from ntpd or from the vmware-tools timesync.
>
> The only workaround I can think of is running a
> "/etc/init.d/nagios stop
> ntpdate
> /etc/init.d/nagios start"
> once a day - which is quite ugly though.
>
> > One thing that might help is setting this to 1 in your nagios.cfg. This
> > will make Nagios periodically check for services that aren't scheduled:
> >
> > check_for_orphaned_services=1
>
> Well, the problem is that the service IS scheduled - just 1 year ahead.
>
> > Besides, to fix this I would make the sanity check reschedule the check
> > for the end of the check period (possibly only if it's not scheduled
> > already), as it wouldn't have to check for this condition for every
> > service on every time shift.
>
> Why for the end? You'll still lose like all checks then. It runs the check
> once and then sleeps, because the check_period is not valid anymore. Then
> the time shifts again - rinse and repeat. You'll end up with one check
> each day for such services.
>
> Regards
>         Sascha
>
> --
> Sascha Runschke
> IT-Infrastruktur
>
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