Too stupid? Services are available, but nagios reports host to be down!

[Heiko Schlittermann]

Hello Israel,

Israel Brewster <israel at frontierflying.com> (Di 08 Apr 2008 19:32:25 CEST):
> On Apr 8, 2008, at 2:50 AM, Heiko Schlittermann wrote:
> >Hello,
> >
> >(using 3.0.1)
> >
> >I've a list of hosts, these hosts are not available for ping, but  
> >normal
> >service checks (SSH, SMTP, ...) work. Nagios reports theses hosts  
> >beeing
> >down! Ugly!
> >
> >If I remember well, older nagios versions "knew" that's enough to see
> >one service on a host to know this host has to be up.
> 
> To a degree, yes- if you aren't actively checking the host (as would  
> appear to be the case from your next paragraph), then as long as all  
> services  on the host are listed as ok, nagios assumes the host is  
> still ok (at least once running, I don't know how it behaves on the  
> initial check). However, should any of the services go into a non-ok  
> state, nagios will immediately check the host (using the host  
> check_command), wherupon, in your case, it would determine the host to  
> be down since it can't ping. The state of the other services does not  
> affect this process, so any other services do not change state.

That's an interesting detail: if ANY of the service checks fails, a host
scheck is scheduled.

This would explain why the host check takes place and fails (if it's
using "ping").

But - my question here, why is *any* failing service a trigger of a host
check? Shouldn't be the failure of *all* services this trigger?

-- 
Heiko
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