Passive service checks via NSCA and requir ed check command defini tion

[Paul L. Allen]

Ralph.Grothe at itdz-berlin.de writes: 

> I missed this thought before sending my last reply. 
> 
> Would you suggest I enabled active checks for the service

No.  If you do that then both active and passive checks will occur on
that service.  You need to disable active checks on any service that
accepts passive check results.  The active check is triggered if the
passive check is stale.  Read the documentation because there are other
things you need to get right for staleness checking to happen. 

> and provided the dummy_check returning state UNKNOWN
> in order to get these states whenever the passive checks didn't
> take place, for whatever reason?

Yes. 

> Well the only reason I can think off is that the remote host
> crashed (or the route thereto).

I can think of other possibilities.  Crond is started late in the init
sequence, after network services.  If there is a problem with something
prior to crond starting crond may not get started but everything you're
monitoring on that server is started. 

> But I covered this already by host icmp checks.

Which won't occur if all the network services are running but crond isn't.
I've also seen machines that run out of resources able to respond to
pings but nothing else. 

If whatever it is you're monitoring is on that same machine then you'll
probably know there's a problem because its network services go down.
But if it's a firewall submitting passive check results about machines
behind the firewall (for scaleability or because those machines are not
reachable from the outside) then the icmp checks are not necessarily
going to tell you that there really is a problem. 

> Another thing strikes me if I enabled active checks. 
> 
> How should I space them, meaning how to size the intervals?

The interval doesn't matter because you don't enable active checks. 

> Maybe my thinking is a bit far-fetched?

I think you need to read the docs some more.  Unfortunately the
information you want is scattered around several different pages. 

-- 
Paul Allen
Softflare Support 




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