Extenal command file limitation

[Andreas Ericsson]

Martin Pozdílek wrote:
> Hello
> 
> It's still problem with max plugin output length in 3.0b6. The increase
> of  max plugin output length cap from 4kb to 8kb was announce in Changelog.
> The maximum of output is defined by these constants in common.h nagios.h
> 
> /*
>    NOTE: Plugin length is artificially capped at 8k to prevent runaway
> plugins from returning MBs/GBs of data
>    back to Nagios.  If you increase the 8k cap by modifying this value,
> make sure you also increase the value
>    of MAX_EXTERNAL_COMMAND_LENGTH in common.h to allow for passive
> checks results received through the external
>    command file. EG 10/19/07
> */
> 
> #define MAX_PLUGIN_OUTPUT_LENGTH                8192    /* max length of
> plugin output (including perf data) */
> #define MAX_EXTERNAL_COMMAND_LENGTH             8192    /* max length of
> an external command */
> 
> But the maximum length of message pushed to nagios through external
> command file is limited to 4kb.


This limitation is put in place in the kernel, which has a hardcoded value
for FIFO's set to 4096 bytes. You need to alter the value (locate it with
git-grep) and then re-compile your kernel.

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

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