Increasing max_pluginoutput_length

[Subhendu Ghosh]

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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