Nagios checks and DNS queries

[Steve Burton]

Dirk H. Schulz wrote:
> Hi folks,
>
> I have two servers running Nagios, one is 2.3.1 on Debian, the other 3.0.5 
> on CentOS. With both I have a peculiar problem:
>
> Both of the servers have 3 different nameserves in /etc/resolv.conf, but 
> when the first nameserver fails, then more than half of the service checks 
> fail ("plugin timed out"). The failure does not occur just shortly, but 
> takes as long as the first nameserver is not running.
> This first nameserver in /etc/resolv.conf is not the master nameserver (all 
> of them are slaves), so it is not a problem of the slave stopping answering 
> when the master fails or any misconfiguration between the nameservers.
>
> This should not be occuring, but it can be reproduced reliably. Now I hope 
> that there is some configuration item I overlooked, but googling did not 
> deliver any hint.
>
> Any help is appreciated.
>
> Dirk
>
>   
Dirk,

my solution was to run a slave name server on the Nagios server itself , 
restricted to only answer queries from localhost.

Steve.

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