Plugin scratchpad string....

[Ethan Galstad]

Peter Åris Krüpl wrote:
> Hi Group,
> 
>     I do lots of snmp stuff from nagios, what i do most often is to 
> check an interface
>     for status, and throughput. The challenge i to acheive this goal 
> with as little snmp traffic
>     as possible, so i wont load the monitored devices unnecessary.
> 
>     To do this i currently store a temporary file from the plugin. It 
> would be nice if one could add
>     another | to the plugin output specifications, so i could have 
> something like:
> 
>     Checkoutput|Performance data|extra string.
> 
>     The point of the extra string is that plugins can pass themselves 
> extra information from
>     invoccation to invoccation. (Per service definition)
> 
>     Why you ask ?!?!
> 
>     Ok, my check interface plugin uses the name of the interface not 
> just a static OID value.
>     So in the first run the plugin get's no extra string passed. 
> Therefore it walks the interface table
>     to determine the index of the interface. The index is returned in 
> the extra string to nagios.
> 
>     The next time the plugin runs it gets passed the extra string, now 
> it can check to see if
>     the interface still has the same index with a single snmpget, if the 
> index is still correct
>     status is retreived and returned back with the extra string.
> 
>     Should the passed index be incorrect the plugin has to execute a 
> full snmpwalk again of
>     the ifAlias table.
> 
>     This can save alot of snmp traffic especially on boxes with 100+ 
> interfaces....
> 
>     Kind Regards
>     Peter Krüpl

Nagios 3.x will allow for custom (user-specified) variables and macros, 
which should help you to accomplish what you need to do.  Once I get to 
documenting 3.x I'll add some info on this.


Ethan Galstad,
Nagios Developer
---
Email: nagios at nagios.org
Website: http://www.nagios.org

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