Separate mail server problems cause Nagios to plotz (or vice versa?)

[up at 3.am]

>>>
>>>> Simultaneously, Nagios, which is on a separate server, will send
>>> out
>>>> notifications that every
>>>> service on every server is down because Nagios cannot reach them. 
>>>
>>>
>>> Why can't it reach them? Is your mail server also your router?
>>
>> Good Gosh, no!  That's why this is so puzzling.
>
> The next time it happens, unplug your mail server's network connection (it failed
> anyway). I'll bet it's flooding the network with (good?/bad?) packets and nagios
> can't get through.

We've got good switches (newer Catalysts) and we're not seeing other servers on
the same VLAN or switch affected.

> It taking the mailserver offline fixes it, at least you know where to look,
>
> I'd also check the mailserver logs. Some aren't too bright about handling bounces
> and if it's misconfiigured, you can end up with an infinite number of bounce
> messages for the bounce messages.

Looking for mail loops sounds like a reasonable start.  I'm not as used to
sendmail as I am qmail, which seems to handle preventing loops a little better,
AFAICT.  I posted to the list to rule out a known issue with nagios, which it
looks like isn't the problem.

Thanks again!


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