Children "unreachable" on soft down?

[Israel Brewster]

So does anyone have any ideas as to how I can resolve this situation?  
It continues to be an annoyance. Thanks.

-----------------------------------------------
Israel Brewster
Computer Support Technician II
Frontier Flying Service Inc.
5245 Airport Industrial Rd
Fairbanks, AK 99709
(907) 450-7250 x293
-----------------------------------------------



On Mar 31, 2009, at 8:17 AM, Israel Brewster wrote:

> On Mar 31, 2009, at 1:09 AM, Andreas Ericsson wrote:
>
>> Israel Brewster wrote:
>>> Does nagios (3.0.3) mark a child host as unreachable when its
>>> parent  enters a soft down state? I am finding myself getting
>>> repeated down  messages for a host (which is, in fact, down), even
>>> though I have  notifications set to only send a single message.
>>> Looking at the logs,  it would appear that what is happening is
>>> that the host is flipping  between "down" (which notifies me) and
>>> "unreachable" (which does not).  The parent host, however, never
>>> enters a hard down state. Looking at  the logs, what I see is that
>>> one ICMP check fails, throwing the host  into a soft down state,
>>> but the next one works just fine, bringing it  back to an up state.
>>> The logic works fine for the parent host- since it never hits a
>>> hard  down state, it doesn't alert, and everyone is happy. But
>>> apparently  with the child host every time this happens, it
>>> switches from critical  to unreachable and back again, triggering a
>>> notification. Is there any  way to keep this from happening? Thanks.
>>
>> Doesn't flapping detection do what you want? You'd get a few
>> notifications, but they'd stop after the 3rd flip or something, I
>> think.
>
> Flapping detection helps, but doesn't solve. For one thing, as you
> mentioned, you still get at least a couple of notifications before it
> kicks in. For another thing, this happens with a frequency of
> something like once an hour or so (not consistently), so the host will
> flip from down to unreachable and back again, triggering an e-mail,
> perhaps do it a second time, and then it will sit in the correct
> "down" state for the next 50 checks or so (thus canceling any flapping
> detection) before repeating the process. It's not like I'm getting
> messages every five minutes or anything, it's just that I'm getting
> repeated down messages every hour or two for hosts that have been down
> and haven't actually changed state.
>
> I could, of course, schedule down time, except that I want to be
> notified if/when the people in the remote station get their act
> together and get the machine(s) in question back online. Also that is
> only partially effective for machines that have been sent in for
> repair, because I don't really know when the scheduled down time will
> be over. They are down, I know they are down, I just don't want to be
> told about it every few hours :-)
>
> -----------------------------------------------
> Israel Brewster
> Computer Support Technician II
> Frontier Flying Service Inc.
> 5245 Airport Industrial Rd
> Fairbanks, AK 99709
> (907) 450-7250 x293
> -----------------------------------------------
>
>>
>>
>> -- 
>> Andreas Ericsson                   andreas.ericsson at op5.se
>> OP5 AB                             www.op5.se
>> Tel: +46 8-230225                  Fax: +46 8-230231
>>
>> Considering the successes of the wars on alcohol, poverty, drugs and
>> terror, I think we should give some serious thought to declaring war
>> on peace.
>
>
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