Re: Net-SNMP perl plugin with Nagios

Hi Dave

On Tue, 2010-11-16 at 08:57 +0000, Dave Shield wrote:

> Hmmm... that sounds as if they might be competing with each other
> in some way.  Perhaps some form of locking.

> What sort of response do you see with a single plugin?

Running the plugin on the command-line takes about 0.5s of CPU time, and
I can't get this much lower.

> If this is slow, then I might suggest you try tweaking the
> plugin to use numeric OIDs and results, and suppress the
> loading of the MIB files.

That's a good idea - although I will have to re-code it not to use
gettable, as (when I contributed the code some years ago) it uses
$SNMP::MIB to look up MIB data.

Thanks for your suggestion of just retrieving a single column - which
will actually be a column and the index.  I tried this, retrieving just
a single column, using gettable($table_name, 'columns' =>
[ $element_state ]).  It doesn't speed things up much as there are only
three columns in the table!  However, in the interests of efficiency,
I'll keep it.

> Can you run the scripts manually (rather than via Nagios)?

I can, and they run quickly.  I haven't been able to reproduce the
problem as the scripts all complete within a very short space of time.

Just a thought, does the process of loading MIBs in multiple processes
at once cause any problems?

I think the next task is to try the folks over on the Nagios mailing
list, see if they can shed any light.

Regards,


Peter



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