MAX_PLUGINOUTPUT_LENGTH

[Andreas Ericsson]

Goetz Rieger wrote:
> Hi all,
> 
> I need a longer maximum plugin output length in Nagios 2.3.1 because I
> have a custom plugin which could possibly return quite a lot of data.
> 
> In include/objects.h MAX_PLUGINOUTPUT_LENGTH is set to 332.
> 
> So I have two questions:
> 
> -Is that the correct define to alter the length of a plugin output read by
> Nagios?
> 

Yes.

> -Is there any drawback when setting the value rather high, say 1000?
> 

Possibly, but not necessarily. The maximum posix-guaranteed atomic 
write-size is 512 bytes. If you increase this number you *might* see 
plugin output getting mixed with output from other plugins. Also, if you 
do this on a large monitoring installation you will double the risk of 
filling up the FIFO nagios uses for receiving check-commands, which will 
cause a build-up of nagios processes that will eventually starve the 
system of memory.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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