[mrtg] Re: mrtg - how to just create the graphs from a generate logfile ?

[Alex van den Bogaerdt]

Donald Mahler wrote:

> I have a  need to be able to generate the graphs myself, preparing the
> logfile  and then calling some subroutine of mrtg to actually make the
> graphs.  I can see how to create the logfile, with epoch time followed by
> the values.   I just don't know how to tell mrtg to "don't expect a value
> on input, just recreate the graph based on what is in this logfile"
> 
> is it possible to do this?   is the executable 14all?  or rateup?  (sorry -
> I'm guessing).

It used to be possible; I didn't check recently.  You need to call
rateup directly, not mrtg or another program.

The command line options to rateup are not documented as well as
they should be (last time I checked anyway) so what I did was build
a wrapper around rateup.  This wrapper wrote the options to a logfile
(*not* the mrtg log file!) and from there it was easy to spot what
mrtg was doing.

Just remove the images, call mrtg (which in turn calls your wrapper),
view the logfile.

Happy hacking!
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