Nagios Reboot Notification

[Paul Weaver]

> 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.

You're pretty lucky if your box reboots inside a minute -- it takes
about 2 minutes for most of our boxes to get through POST!

> them) or that it's checking _very_ frequently. There's no 
> magic 'some box just rebooted'  
> protocol...

Hmm, a trap coming from the PSU (sudden current change), or switch (link
going down then up)

Most monitoring systems I've seen use uptime, keep a track of the last
value, and the time it happened, then alert if that value resets to
close to zero (or even if it returns outside of a predicted range). The
reason you keep a track of the value is to avoid broken alerts when the
snmp counter rolls over. 

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