Nagios Reboot Notification

[Marc Powell]

On Jun 11, 2009, at 6:29 PM, Kevin Mitnikc wrote:

> Marc,
>
> I don't think this will work for me ...reason being Nagios will do  
> its check, lets say every minute.  If the server reboots  
> unexpectedly and comes up in between that check period, Nagios will  
> never see the reboot.  I could be wrong, but is that not accurate?

Sure it will. uptime is a counter that increases from 0 to infinity  
(essentially) and resets on reboot. The snmp check I use says that if  
that counter is less than 50,000ms (~8.3 minutes), show a WARNING. If  
you check every minute, you'd see a WARNING status for 7 or 8 minutes,  
then a reset to OK.

> Other application will notify you as soon as the server shuts down  
> or reboots.  Is this because its being monitored differently or  
> different checks are being executed.

I have no idea. I presume that these applications are receiving traps  
from the device (and it is configured to send them) or that it's  
checking _very_ frequently. There's no magic 'some box just rebooted'  
protocol...

>   As a Nagios newb, it seems that Nagios has cycles of running  
> checks that the user defines.

Yes, it does.

> But I would like to try you suggestion.  Will I simply add the  
> define command in the commands.cfg config file and then reference  
> that with the check_command in the hosts.cfg file?

Yes. This presumes that you've configured SNMP on the target device  
and set the read communities to match on both sides.

--
Marc


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