check_cluster2 does not work as expected

[Werner Flamme]

Jim Avery [07.09.2009 10:03]:
> 2009/9/5 Werner Flamme <werner.flamme at ufz.de>:
>> Hi,
>>
>> I want to check a cluster consisting of 2 nodes. The task is simple:
>> show how many nodes are up (respective down, there are two nodes).
>>
>> The command definition is:
>>
>> $USER1$/check_cluster2 -h -l $HOSTALIAS$ -w 1 -c 2 -d $ARG1$
>>
>> So, the host alias of the cluster will be the label, the plugin should
>> give a "warning" when 1 node is down, and should cry "critical" when
>> both nodes are down.
>>
>> That's what I thought this command would do.
>>
>> And that's what I read in the mean time:
>>
>> CLUSTER OK: FW-Cluster: 1 up, 1 down, 0 unreachable
>>
>> Sorry? Why is "1 down" not seen as warning? What do I do wrong?
>>
>> TIA
>> Werner
> 
> 
> I'm not familiar with check_cluster2, but came across a similar
> situation when using check_cluster for a host check recently.  When I
> run check_cluster --help, it tells me :-
> 
>  See:
>  http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT
>  for THRESHOLD format and examples.
> 
> I found I had to use "-w 0 -c 1" to make the plugin behave how I
> wanted (warn if one host is down and critical if two are down).

Good graciuos ;-) - it never occured to me when reading

 -w, --warning=THRESHOLD
    Specifies the range of hosts or services in cluster that must be in
a non-OK state in order to return a WARNING status level

that a THRESHOLD of zero hosts means 1 host. But this really seems to
work, since when both nodes were down (yesterday afternoon and this
morning), the status finally changed to WARNING.

All right, I changed -w 1 -c 2 to -w 0 -c 1. I still wonder how we
managed to get the alarms on the other clusters weeks ago :-(

> Also, if you're using this as a host check (not a service check) note
> that if the host check returns a warning state, Nagios will usually
> interpret this to mean that the host is 'UP'.  See
> http://nagios.sourceforge.net/docs/3_0/hostchecks.html for an
> explanation of how plugin results are interpreted for host checks in
> Nagios.

Thanks - lucklily we use a test that only returns OK and CRITICAL.

Thanks for the hint - I think one of the nodes might fall down any
minute now, I will tell if this works ;-)

Regards,
Werner

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