Graphing solutions comparision

[Joerg Linge]

Am Dienstag, 31. Oktober 2006 21:20 schrieb Tedman Eng:
> Hi Nagios Users,

Hi Tedman

> I'm attempting to categorize the various graphing solutions and need input
> from people familiar with the various projects.
>
> >From what I can tell, the graphing add-ons are mostly divided into 2
> > schools
>
> of thought:
>
> 1. Let the standard nagios plugin decide the status, and then graph the
> numbers.
> (NagiosGrapher, PNP, others?)
>
> Nagios plugin "check_snmp -w 50" retrieves value "60%"
> Nagios plugin checks 60 > 50, Alarms "Warning!"
> Nagios plugin passes "60%" to be graphed (from perf data, regex of output,
> etc)
> Grapher inserts 60 into RRD

Right. But PNP also extracts additional Informations if a Plugin produces 
valid Perfdata. MIN, MAX,WARNUNG and CRITICAL Valuas are also stored for 
further usage.

>
> 2. Rewrite the plugin to graph, and then decide the status based on the RRD
> result.
> (Apan, Oreon, others?)
>
> Grapher plugin "check_graph_snmp -w 50" retrieves value "60%"
> Grapher inserts 60 into RRD
> RRD returns  "New=60, Previous=50, Avg=55"
> Grapher plugin checks 55 > 50, Alarms "Warning!"
>
>
> The advantage of solution 2 is that thresholds can be based on the RRD
> calculation, which is AFAIK the only way to alarm on COUNT data types.  The
> disadvantage is that custom plugins need to be written, or in some cases a
> check_graph wrapper.  Also, check latency is increased by the amount of
> time required to insert the values into the RRD file.

Hmmm, i dont think its the only solution. The most traffic Plugins ( for 
example check_snmp_int.pl ) use temporary files to store the previous values.
 
> Please let me know your experiences of which fits into which category, of
> if I've mischaracterized any of the above.

I think graphing should be done by addons and not by the plugins.
The check execution time must be as short as possible.

Jörg


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