Hello,
On 3/28/2006 8:01 PM, Dirk H. Schulz wrote:
Hi folks,
today both our dns servers went out of function.
Funny day, eh?
As a result every service check in nagios timed out after 10 sec. and
was CRITICAL.
EVERY one of several hundred!
Since service check definitions depend on host definitions and host
definitions contain ip addresses I would not have expected a dns outage
to have any effect on nagios' service checks.
Can anyone explain why there IS an effect? I would like to understand it
more deeply.
Rhis sounds like it depends only on your Nagios setup and your network.
For example, if you _only_ use IP adresses and not DNS in your Nagios
configuration, all your routers do _not_ need DNS, and all your services
do _not_ depend on DNS (think of verifying reverse mapping for mail
address verification, or SSL certificate checks, for example, or nrpe or
(x)inetd or TCP wrappers... lots of opportunities to need DNS without
being aware of it) having a DNS outage should not affect service state.
In other words: Since you experienced service failures, something _must_
depend on either DNS or some outage not directly monitored affected DNS
as well as all other checks you run. Or it's all been a great coincidence...
Arno
Dirk
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--
IT-Service Lehmann [EMAIL PROTECTED]
Arno Lehmann http://www.its-lehmann.de
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