Random Down times?

[Demetri Mouratis]

On Fri, 18 Feb 2005, Andreas Ericsson wrote:

> Demetri Mouratis wrote:
> > On Thu, 17 Feb 2005, Bill Akins wrote:
> >
> >
> >>Hi folks,
> >>
> >>Running Nagios 2.0b1 on RHEL3
> >>
> >>I have about 160 servers monitored with over 600 services monitored and
> >>Nagios is working great.  I do have a problem with a pool of Citrix
> >>servers I monitor.  Through Control-M, machines are rebooted at random
> >>times (once no users are logged on and certain other conditions are met)
> >>and then they are added back into the pool.
> >>
> >>My question is how can I turn off or delay alerting on unreachable for
> >>5 minutes to accommodate the reboot?  I want to know if the machine goes
> >>away for more than 5 minutes.  I am currently checking for several
> >>services running on these machines as well as disk space and ping.
> >
> >
> > Have your citrix servers send a passive service check to your Nagios box
> > saying to deactivate service checks for that host.  Then have you init
> > script, or some such on your citrix box turn checks back on once it comes
> > back up.
> >
>
> This is a good idea, and not terribly cumbersome to implement.
>
> > That or increase your service check times or retries times to accommodate
> > a 5 minute outage but not a 10 minute one.
>
> This won't work. Nagios will start checking host status upon soft
> service states and do ALL host checks in serial until it gets a good
> response or runs out of max_check_attempts, meaning this idea would
> effectively DOS your nagios every time a machine reboots for
> (hostobject)max_check_attempts * hostcheck_timeout seconds.

You're right.  I was thinking about my own environment where I fake host
checks with check_dummy to avoid the problem you mention above.
---------------------------------------------------------------------
Demetri Mouratis
dmourati at linfactory.com



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