Nagios-devel digest, Vol 1 #1058 - 2 msgs

[Vegard Hanssen]

Andreas Ericsson wrote:

> Please refrain from top-posting. It makes following the discussion a 
> lot harder.
>
> Vegard Hanssen wrote:
>
>> There is a problem with defining check-host-alive to check_nrpe.
>>
>> A normal problem in my setup:
>>
>> One host get a too high load. This will time out the nrpe checks, 
>> giving me 5-10 sms for the timeout, and then (2 minutes later) the 
>> same sms for OK. The host isn't down, it's just in a very busy state, 
>> and I know this since I don't get a host down message. If I change 
>> the check-host-alive to nrpe I will then get a host down message, 
>> which can mean anything from high load, host is unreachable or host 
>> is actually down. Host down = I have to drop everything and get to 
>> work, High Load = let's give it a minute to cool down first.
>>
>> I could do the same as Øysten Bleie suggest, but I'm not sure that's 
>> good either. Actually I'm not sure what's best to do, so I've for the 
>> moment stuck with all the sms.
>>
>
> You could bite the bullet and set up the service dependencies. You 
> want Nagios to automagically understand that there's a relationship 
> between the nrpe-based services and the nrpe-service itself, but since 
> Nagios has no understanding of what checks you're running this desire 
> is quite complex to implement. Nagios lets you do the part requiring 
> accuracy (namely the "what needs what" part) and then handles the rest 
> for you.
>
> With some clever scripting and a generic naming convention I'm sure 
> you'll be able to set everything up in half an hour, saving you quite 
> a few notifications on failures.
>
I know this is complex, that's why I haven't figured out a good way to 
do it yet. Setting up service dependencies aren't that easy either. 
Creating a script which can generate the files is easy, but how do you 
set it up? Which of the services will fail first? You never know. So I 
need to put every service as depence of other services, which isn't very 
smart. Or does nagios always check the master before sending out a 
notification failure on a service dependency?

And, if I put the master on eg. load - when I get a message, will this 
mean the load is so high that it's a problem for the other services or 
just load? Which brings me back to finding the solution. So far I'm 
stuck with all the messages if I want to be able to pinpoint the real 
problem. You can't always put a computer to do a humans work, yet.

-- 
Mvh / Kind regards


Vegard Hanssen
Xait A/S

vegard.hanssen at xait.no

For general enquiries please call Xait support at: +47 51 95 02 13

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