Increasing max_pluginoutput_length

[Subhendu Ghosh]

Sorry - missed the nagios mod.

Have you tried pointing nsca.cfg to a non-exisitent cmd file and specified 
an alternate dump file and checked the results?

-sg

On Thu, 21 Jul 2005, Peter Kostik wrote:

> Thanks for a quick reply. However, as I stated in my
> original post, I did change MAX_PLUGINOUTPUT_LENGTH in
> both nsca and nagios to 2k. I also changed
> MAX_INPUT_BUFFER from 2k to 8k in nsca.
>
> Pete
>
> --- Subhendu Ghosh <sghosh at sghosh.org> wrote:
>
>> nagios/include/objects.h
>> objects.h:#define MAX_PLUGINOUTPUT_LENGTH
>>            348
>>
>> Nagios itself has a limit - that can be changed as
>> you are doing for NSCA
>> - provided all your platforms support the size as
>> less than PIPE_BUF
>>
>> -sg
>>
>> On Thu, 21 Jul 2005, Peter Kostik wrote:
>>
>>> My monitored system is Solaris 8. From limits.h:
>>>
>>> PIPE_BUF       5120                         /* max
>> #
>>> bytes atomic in write to a pipe*/
>>>
>>> As you can see ~5k is more than enough for my 1.8k
>>> plugin outputs. Nagios host is RHEL4 and as you
>>> pointed out correctly PIPE_BUF is 4k, but I don't
>>> think it matters b/c message comes to Nagios
>> truncated
>>> to 937 bytes. This is how I send alarms in my
>> plugin
>>> via send_nsca (perl):
>>>
>>> open(NSCA,"|$notifyCmd") or die ("ERROR: Cannot
>> pipe
>>> to $notifyCmd: $!");
>>> print NSCA $notifyMsg;
>>> close(NSCA);
>>>
>>> Anyone has similar problem or can think of a
>>> workaround?
>>>
>>> Thanks,
>>> Peter
>>> --- Subhendu Ghosh <sghosh at sghosh.org> wrote:
>>>
>>>> On Mon, 18 Jul 2005, Peter Kostik wrote:
>>>>
>>>>> Hello all,
>>>>>
>>>>> by saying what an incredibly superior product
>>>> Nagios
>>>>> is, I will be probably repeating hundreds of
>>>> others
>>>>> that use it and love it, so let me get to the
>>>> point.
>>>>>
>>>>> I am running 2.0b3 to monitor thousands of
>>>> services on
>>>>> hundreds of servers, using mainly passive checks
>>>>> (nsca/send_nsca) and of course nrpe/check_nrpe
>> to
>>>> make
>>>>> sure things are running as they should.
>>>>>
>>>>> Some of my plugins return long outputs (2k) via
>>>>> send_nsca. So what I did is increase
>>>>> MAX_PLUGINOUTPUT_LENGTH in common/common.h in
>> nsca
>>>>> addon and also in core nagios in
>>>> include/objects.h. I
>>>>> believe original value was something around 300
>>>> bytes
>>>>> so I bumped it up to 2k. However, my plugin
>>>> outputs
>>>>> still get truncated at around 800 bytes (don't
>>>> know
>>>>> exact value of top of my head). Had anyone
>> played
>>>>> around with changing these values and got it
>>>> working
>>>>> right? I am wondering if there is another limit
>>>> set
>>>>> somewhere else that overrides this.
>>>>>
>>>>> Thanks for the great product.
>>>>>
>>>>> Pete
>>>>>
>>>>
>>>> There is system limit for a named pipe buffer.
>>>> check your os' limits.h for PIPE_BUF
>>>>
>>>> RHEL4 defaults to 4096 characters, but linux used
>> to
>>>> have a smaller buffer
>>>> hence the general size restriction in Nagios.
>>>>
>>>> --
>>>> -sg
>>>>
>>>
>>>
>>>
>>>
>>>
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>>
>> --
>>
>>
>
>
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