Using Nagios to monitor "service-less" hosts

[Andy Shellam (Mailing Lists)]

Ah, okay, brilliant that explains things MUCH better than the docs :)

I currently only have 6 hosts and 39 services and can't say it 
increasing more than 8/100 in the next year, but I'll bear it in mind 
and perhaps change the two previous service-less hosts then.

Thanks,

Andy.

Tedman Eng wrote:
>> -----Original Message-----
>> From: Andy Shellam (Mailing Lists)
>> [mailto:andy.shellam-lists at mailnetwork.co.uk]
>> Sent: Tuesday, November 07, 2006 8:44 AM
>> To: Nagios Users mailinglist
>> Subject: Re: [Nagios-users] Using Nagios to monitor 
>> "service-less" hosts
>>
>>
>> Personally I've not noticed any performance decrease having 
>> host checks 
>> set - it's on a moderately spec'd server, and if a gateway 
>> does go down, 
>> I know about it almost immediately and can take action.
>>
>> JOOI, why is it said that a host check degrades performance?  
>> All it's 
>> doing is running a command like a service? 
>>     
>
> Host checks preempt all other check operations, they are not performed in
> parallel like service checks are.  In a small monitoring environment (less
> than a few hundred service checks), this may have little noticable impact.
> But if you watch the scheduling queue closely while performing some "host
> down" experiments with Nagios 2.0 active host checks enabled, you'll see the
> adverse effects firsthand.  High service check latency compounds as more and
> more hosts are actively checked.
>
> It's generally a better solution to set up a ping service, even if it's the
> only service (if it's responding to a request, then it's considered a
> service)
>
> An good analogy is to think of hosts as "containers" for the services.  Host
> checks are tests to see if the entire container is missing.
>
> !DSPAM:37,4551093040411234018522!
>
>
>   


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