Re: [Devmon] Changing the if_load graphs displayed on Xymon

[Jeremy L. <jla...@re...>]

I think the order that graphs are displayed is governed by the
rrd_name_compare() function inside showgraph.c.  This sorts numerically for
RRD filenames that are all numeric, otherwise by strcmp() order.

I think the rrd_name_compare() is actually comparing the captured component
of the FNPATTERN expression in devmon-graph.cfg.  This is defined as:

        FNPATTERN if_load.(.*).rrd

So I suppose it might be possible to redefine this to be something like
this:

        FNPATTERN if_load.Gi0/(.*).rrd

Then the captured expression will be entirely numeric, and it MIGHT cause
Xymon to sort numerically.  Of course this is only useful to you if you
only have Gi0/* interfaces.

You might be able to force this code to sort correctly by tweaking the
Devmon template to pad the interface names with zeroes, so that you have
Gi0/01, Gi0/02 ... Gi0/09 before Gi0/10.

Alternatively, you could tweak the rrd_name_compare() function in Xymon to
suit your requirements.

This would be a useful change to Xymon.  I think the best long-term option
is to develop and submit a Xymon patch to handle this case.  You could
adjust rrd_name_compare() so that it looks for and handles two strings that
only differ by numerics, and compares numerically.  This would be somewhat
complicated.

More simply, you could allow defining some kind of flag to specify numeric
or ASCII sort order in a graphs.cfg file.  It might work like so:

        FNPATTERN if_load.(.*).rrd
        SORTNUMERIC yes

I think this could all be done within web/showgraph.c.  But I'm not a C
programmer, so would be difficult for me to do reliably.

Cheers
Jeremy



On 29 September 2013 00:22, Martin Davies <vas...@go...>wrote:

> Hi all.
>
> Perhaps I'm just being lazy, but I'm looking for a way of changing how the
> default if_load graphs are displayed on Xymon/Devmon.
>
> Xymon version is 4.3.12
> Devmon version is 0.3.1-beta1
>
> What I want is for the graphs to be displayed in interface or numerical
> order, but, out of the box, Devmon and Xymon display the graphs sorted in
> alphabetical order.
>
> Normally this is not an issue, but it is slightly tedious to have to scroll
> through the graph for interface Gi0/1 then through Gi0/10, Gi0/11, Gi0/12,
> Gi0/13, Gi0/14, Gi0/15, Gi0/16, Gi0/17, Gi0/18 and Gi0/19 graphs to
> eventually get to Gi0/2.  is there not a way to either adjust the interface
> so it reads Gi0/01, Gi0/02 etc or a flag to 'sort numerically'?
>
> Is this really a Devmon issue?  If not, perhaps I should ask the same
> question of the Xymon mailing list?
>
> Thanks
>
> Martin
>
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