Issues with check_by_ssh

[Matthias Kellermann]

Hugo,

thanks for your answer.

Hugo van der Kooij schrieb:
> On Wed, 8 Aug 2007, Matthias Kellermann wrote:
> 
>> tonight I got lots of false-positive messages from Nagios. All these
>> messages came from services checked with check_by_ssh. Strange thing is
>> that SSH was running on all servers and there were no problems with the
>> network connectivity. All other services on these servers had no errors.
>> After 20 minutes or so check_by_ssh worked fine again.
>>
>> I've got no errors in the logs (i.e. auth.log) - whether on the Nagios
>> server nor on the servers to be monitored. The only error I got from
>> check_by_ssh is:
>>
>> Plugin timed out while executing system call
> 
> Check for DNS issues. You may have had an issue with reverse DNS entries 
> resulting in the extra delay on each ssh connection. It is an educated 
> guess but it would explain the behaviour.

I've checked this. All DNS server were available and working fine when
that error occured. All other services with the same timeout (10s) had
no errors at all. But maybe I can disable SSH's reverse DNS resolving
"feature" to get rid of possible errors caused by DNS errors.

Regards,
Matthias


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