checkhostalive vs ping service

[L B]

On Fri, Oct 31, 2008 at 5:33 PM, Marc Powell <marc at ena.com> wrote:
>>> If you like the suppression of notifications for services on down
>>> hosts or would like to use the parenting/reachability logic, host
>>> checks would be necessary.
>>
>> I don't get notification of services unavailability even with hot
>> check disabled, because Nagios does a host check directly after it
>> find a service unavailable.
>
> I thought you said you didn't do host checks? So you're not really
> asking about the merits of a host check v.s. a service check but
> rather the merits of (Regularly Scheduled host checks and no service
> checks) and (Service check and on-demand host check only)?

Yes.

I thought my hostchecks were disabled but I observed that they are
done when a service is unavailable. So yes, I don't do scheduled
hostchecks, but hostcheck are/seem to be done on demand.

>
>> Not additional if you replace the ping check by the hostcheck
>
> I guess that I'm a traditionalist and still feel that every host
> should have a service check =) That may be a something I need to change.
>
>> Is the impact of enabling hostchecks vs ping service only a status of
>> UNREACHABLE instead of DOWN for child hosts ?
>
> No, notification suppression as well, but if you're doing on-demand
> host checks currently you're already getting that. The only real
> benefits may be one less regular check to configure (the service
> check) and the possible use of a cached host check instead of a new
> active check when determining outages. IMHO based on my expectation/
> understanding of the new host check methodology, the actual number of
> checks performed either way are going to be similar except over very
> long time periods with volatile networks.
>

Ok, so I'm not sure I'm going to setup hostchecks :/

Thanks for you answers Mark!
-- 
L.B.

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