Services are dependent on the host they run on?

[Roberto Nunnari]

Hi Gerald.


Ortner, Gerald wrote:
> What host/service check interval/max check attempts do you use?
> Maybe the host check interval is much longer than the service check interval.
> If the services become hard state critical before the host check does, the service notifications will be sent, as Nagios isn't aware of the host problem.
> I don't know how Nagios behaves if the host is only in soft state?

I believe that may be the problem.
The service and host check interval were all 1 minute.
Maybe, if the checks on the services happen to fail before the checks on 
the host, then notification for all failed services will be sent anyways.

This assumes that nagios doesn't care about service dependency on the 
host running the service when the host is in soft state critical, but 
only when the host is in hard state critical.

I modified host/service check interval as follow:
define host {
...
         max_check_attempts              3
         normal_check_interval           1
         retry_check_interval            1
...
}
define service {
...
         max_check_attempts              3
         normal_check_interval           3
         retry_check_interval            2
...
}

The above should always give host checks for the host to reach a hard 
state critical before the services in case the host goes down.

I've already run an easy test and the result confirmed what stated 
above, but I'll run some more tests as soon as possible, maybe already 
tomorrow, and report the results here.

Thank you to all.
Robi

> 
> hth
> gerald
> 
>> -----Ursprüngliche Nachricht-----
>> Von: Roberto Nunnari [mailto:roberto.nunnari at supsi.ch]
>> Gesendet: Freitag, 27. Mai 2011 09:01
>> An: Nagios Users List
>> Betreff: Re: [Nagios-users] Services are dependent on the host they run on?
>>
>> Hi Mark.
>>
>>
>> Frost, Mark {PBC} wrote:
>>> Maybe I'm missing something but I thought that suppressing notifications
>> for services on the same host when the host goes down is the default
>> behavior.  It's only when you have to suppress notifications from different
>> hosts that you need host/service dependencies.
>>
>> That's exactly what I was expecting, but it doesn't seem to work that way.. at
>> least not for me.
>>
>> Yesterday for instance, a host went down because of a hd controller failure,
>> and I received 22 sms..
>>
>> Robi
>>
>>
>>>
>>> Mark
>>>
>>> -----Original Message-----
>>> From: Assaf Flatto [mailto:nagios at flatto.net]
>>> Sent: Thursday, May 26, 2011 1:39 PM
>>> To: Nagios Users List
>>> Subject: Re: [Nagios-users] Services are dependent on the host they run
>> on?
>>> Martin Hugo wrote:
>>>> Hi Robi,
>>>>
>>>> I have never done it but I know you can make hosts/services children that
>> will not report if the parent is down.
>>>> Hope this puts you on the right track.
>>>>
>>>> Marty
>>>>
>>>> -----Original Message-----
>>>> From: Roberto Nunnari [mailto:roberto.nunnari at supsi.ch]
>>>> Sent: Thursday, May 26, 2011 12:47 PM
>>>> To: nagios-users at lists.sourceforge.net
>>>> Subject: [Nagios-users] Services are dependent on the host they run on?
>>>>
>>>> Hi all.
>>>>
>>>> Some time ago, I've installed and configured nagios to monitor our IT
>>>> infrastructure.
>>>>
>>>> It works very well and we're happy with it.
>>>>
>>>> There's still one problem though:
>>>> When a host goes down, nagios sends notifications not only for host
>>>> down, but also for all services running on that host. When a host
>>>> goes down, I would like nagios to only send notifications about the
>>>> host down, and not for all the services running on that host.
>>>>
>>>> How can I achive that?
>>>> May it be a configuration error from my side? I thought that to
>>>> nagios, services would be dependent from the host running them..
>>>>
>>>> Any hint/advice/guidance is very welcome.
>>>>
>>>> Thank you and best regards.
>>>>
>>>> Robi
>>>>
>>> check out service dependencies
>>>
>>> http://nagios.sourceforge.net/docs/3_0/dependencies.html

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