Rampant Nagios

[admin at jpk236.com]

Thank you for your very informative answer.  I'd like to know if perhaps 
it would change if I had been more specific regarding my setup.

2 Central Fail-Over servers
8 Distributed Monitoring Servers

I use NSCA to do the distributed monitoring.  The only servers I've seen 
the CPU usage on is the distributed monitoring servers, which have no 
children.  I would completely agree with your answer had the problem 
been with a central server, but the fact that it's with a distributed 
server still leaves me confused.

  - Justin Kulikowski
	[ http://www.jpk236.com ]

Andreas Ericsson wrote:
> admin at jpk236.com wrote:
> 
>> Nagios v2.03b3
>> FreeBSD 5.4-RELEASE-p1
>>
>> On some of the hosts I monitor I've been noticing some peculiarities.
>> Nagios will spontaneously become a CPU hog -- using an upwards of 80-90%
>> CPU, sometimes higher.
>>
> 
> This is probably when a host with children has gone down. Nagios will 
> force a check of all hosts and services beyond and "inside" the down 
> host. This eats a lot of CPU, obviously.
> 
>> I try stopping nagios using FreeBSD's rc.d script for nagios.  The
>> output claims nagios has stopped, but when I run `ps auxwww` there is
>> still an instance of nagios running.  I can only assume the rc.d script
>> was able to remove the lock file, but was not able to stop the process.
>>
> 
> This is because one of the threads (service_result_worker_thread) sets 
> its cancel state to deferred and then goes off to do some 
> uninterruptable IO. It will die eventually, but not straight away 
> (unless it's just reached the pthread_mutex_unlock() at the end of its 
> base function).
> 
>> Has anyone else experienced this behavior?
>>
> 
> It is present in all nagios since 2.01b. If it's still running after 10 
> seconds, you've got a real runaway.
> 
>>  - Justin Kulikowski
>>     [ http://www.jpk236.com ]
>>
>>
>>
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> 


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