[mrtg] Get a graph from an external source

Stefano Giraldo stefano at neotokyo3.it
Wed Jul 14 17:45:35 MEST 2004

I'm trying to get a graph from the output of script.

My script cat_rw take a value from a router,
as wrote on manual MRTG need only one value
to generate a graph, so my script output is only
one value.

This is what i put in mrtg.cfg file:

Include: /etc/script_mrtg/template.mrtg

And this is template.mrtg:

Target[router_name]: `/etc/script_mrtg/cat_rw.sh`
AbsMax[router_name]: 1000000
MaxBytes[router_name]: 500
WithPeak[router_name]: ymw
Options[router_name]: growright, gauge, absolute
ShortLegend[router_name]: Load
YLegend[router_name]: Load
Title[router_name]: Load
PageTop[router_name]: <H1>Load</H1>
    <TR><TD><FONT COLOR="#00FF00">In</FONT>:</TD><TD>Load 0</TD></TR>
    <TR><TD><FONT COLOR="#0000FF">Out</FONT>:</TD><TD>Load 1</TD></TR>

And cat_rw script give values near this:

Now, when I restart MRTG it give theese errors:

Immediatly after the restart:
WARNING: Problem with External get '/etc/script_mrtg/cat_rw':
   Expected a Number for 'out' but nothing'

And after the processing of all router interfaces under monitoring:
ERROR: Target[router_name][_OUT_] ' $$target[156]{$mode} ' did not eval into
defined data
WARNING: Skipping Update of router_name, outlast is not defined

Someone know why?
And why MRTG ask me for two values (IN and OUT)
when Tobi wrote that only one value is needed?

Thank's a lot for any suggestions.



Stefano Giraldo
I.NET S.p.A. - Operations Department
Via Darwin, 85 20019 Settimo Milanese (MI), Italy

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