Removing host checks for non-OK passive results

[Bruce Campbell]

On Wed, 24 May 2006, Ton Voon wrote:

>
> On 24 May 2006, at 10:59, Joerg Linge wrote:
>
>> Am Mittwoch 24 Mai 2006 11:37 schrieb Bruce Campbell:
>>>> We considered using a "cache" value for a host status - I think the idea
>>>> has merit and would reduce a large number of host checks, especially if

>>> See the "Workaround for 'Host DOWN' false-positives" thread for another
>>> way of doing it (slurp in the entire status.dat file if you've got a small

> This doesn't seem to be the same thing that this thread is about (reducing 
> the amount of invocations of the host check because of non-OK statuses from 
> active or passive checks).

It is very similar.  Either you can invoke a 'magic' host check script 
which checks the status of a particular service (either via status.dat or 
seperate cache file), or you can have the host configured only for passive 
checks and check_freshness, and submit the results via a service check.

Or, your host check command can do caching itself, which I suspect that 
you were implying previously.

> While the solutions above do the job of updating the host status, you lose 
> the "specialness" about host checks (invoked on-demand, reachability logic, 
> etc).

There is nothing special about host checks that cannot be done with 
properly set up service dependencies.  However, the host checks are a much 
easier way of setting up these dependencies.

> Going back to the original problem, would a retry_check_interval for host 
> checks help with this particular case?

I don't believe so.  Nagios will still execute the host_check command each 
time a service on that host has a non-OK state.  Since you can have a dead 
host which still responds to ping, this is a lot of executions of the 
host_check command when you have a lot of services on said host.

-- 
   Bruce Campbell


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