[mrtg] Re: Moving from MRTG to MRTG+ rrdtool?

[Bigelow, Andrea L.]

> I've so far been putting an instance of MRTG into /etc/crontab
> after the fashion of:
> 0-59/5 * * * * root /usr/bin/mrtg /etc/mrtg/switch1.cfg
> 2-59/5 * * * * root /usr/bin/mrtg /etc/mrtg/switch2.cfg
> 3-59/5 * * * * root /usr/bin/mrtg /etc/mrtg/switch3.cfg
> 4-59/5 * * * * root /usr/bin/mrtg /etc/mrtg/switch4.cfg
> 5-59/5 * * * * root /usr/bin/mrtg /etc/mrtg/switch5.cfg
> 0-59/5 * * * * root /usr/bin/mrtg /etc/mrtg/switch1.cfg
> 
> I've heard that this does not scale well-

Tim -- 

Speaking from experience, this is a disaster to scale. I do this by
daemonizing MRTG. Once you've generated your config file, add the following
lines to the global options section, where WorkDir and all that are. 

RunAsDaemon: Yes
Interval: 5

If you use separate config files for each device (legal - this is what I
do), you'll need to add that to every file. 

Then, run the MRTG command just once, and it'll keep running itself as a
sleeping process. 

You will need to make sure these processes get started on bootup -- I made a
file under my equivalent of rc.local called mrtg.sh that just runs all the
commands. 

Andi

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