Checks that compare previous values

[Marco Ramos]

Hi,

On Tue, 2006-05-30 at 15:55 +0100, Jee Kay wrote:
> Is there some way to make checks compare the value they've retrieved
> against the previous value of that service?
> 
> Specifically, I would like to be able to alert on excessive throughput
> on some switchports. The obvious way to do this is check the inOctets
> every minute and compare the value just retrieved against the last
> value; if that *8/60 is more than a certain amount then we need to
> alarm.
> 
> A rough timeline would be:
> 
> 000 seconds: Check; gets 150. No previous value - ignore completely.
> 060 seconds: Check; gets 300. Total bytes passed in the last minute = 150. OK.
> 120 seconds: Check; gets 3000000. Total bytes passed in the last
> minute = too many. WARNING.
> 
> 
> Is there any functionality in Nagios that would make this sort of
> thing easy, or do I need to write a wrapper of some description for
> this?

No. I think the easiest way is to write a wrapper that writes each
script iteration to disk so it can always compare each iteration with
the previous one. I'm using this approach in some scripts and it works
fine.

HTH,
Marco Ramos

> Thanks in advance,
> Ras
> 
> 
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