When using mrtg with RRDtool you are replacing rateup with the
RRDtool perl module RRDs.pm. To enable RRDtool support in mrtg
you have to add the line
to your mrtg config file.
MRTG needs access to both the RRDtool perl module RRDs.pm and to the
If these two items are not installed in locations where perl can find them
on its own, then you can use the following two parameters to supply the
For the location of the rrdtool executable you put
For the location of the perl module it would be:
When you have made this modification to the configuration file, several
things will happen when you run mrtg again with the new config file:
The advantage of whole thing is that the mrtg will become much
faster. Expect the runtime to drop to 20% of the previous value. (I would like
to get some feedback on this from folks with large installations.)
mrtg will take all your old .log files and convert them to .rrd
format. (The .log files dont get touched in the process, so if things
dont work out they are still there.)
mrtg will use rrdtool to update its databases. These will have a new format
called rrd which is totally different than the native log format of
the classic mrtg.
mrtg will not create any webpages of graphs anymore.
It will only query the routers for traffic information and update its rrd
Mind you, though, while the logging process of RRDtool is very fast, you
are also gaining some time by neither creating graphs nor updating webpages.
The idea behind this is that it is more efficient to create
graphs and webpages on demand by using a cgi script.
At the moment there is no official script to do this, but two
contributers have created such scripts:
One4All aka 14all.cgi
This was the first program to take over the webpage creation and graphing task.
It has been developed by Rainer Bawidamann
firstname.lastname@example.org. You can find a copy
on Rainers website: http://my14all.sourceforge.net/
The program comes with its own documentation
This is another CGI frontend for mrtg running with rrdtool. The main difference between this and 14all is
that the web pages it creates are much more stylish than the ones from mrtg, plus they support User
Defined summary graphs and different levels of Authentication and Authorisation. This has been written by
Steve Shipway (email@example.com). You obtain a copy, and find a forum and demonstration system at
The program comes with its own installation instructions and install script.
The mrtg-rrd script is a CGI/FastCGI application by Jan Yenya Kasprzak for
displaying MRTG graphs from data in the RRDtool format. It is an intended
replacement for the 14all.cgi script. It can make your monitoring system
faster because MRTG does not have to generate all the PNG files with graphs
every 5 minutes or so. Instead of this the graphs are generated on-demand
when the user wants to see them. http://www.fi.muni.cz/~kas/mrtg-rrd/