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RedHat 9 (Linux i386) - man page for mrtg-rrd (redhat section 1)

MRTG-RRD(1)				       mrtg				      MRTG-RRD(1)

       mrtg-rrd - How to use RRDtool with MRTG

       After using MRTG for some time you may find some limitations. Mostly in the areas of per-
       formance and graphing flexibility. These are exactly the areas addressed by rrdtool. To
       learn more about RRDtool check out its website on


       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

	LogFormat: rrdtool

       MRTG needs access to both the RRDtool perl module RRDs.pm and to the rrdtool executable.

       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 appropriate directories.

       For the location of the rrdtool executable you put

	PathAdd: /usr/local/rrdtool/bin/


	PathAdd: c:\rrdtool\bin

       For the location of the perl module it would be:

	LibAdd: /usr/local/rrdtool/lib/perl/


	LibAdd: c:\rrdtool\bin\lib\perl

       When you have made this modification to the configuration file, several things will happen
       when you run mrtg again with the new config file:

       1.  mrtg will take all your old ".log" files and convert them to ".rrd" format. (The
	   ".log" files don't get touched in the process, so if things don't work out they are
	   still there.)

       2.  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.

       3.  mrtg will not create any webpages of graphs anymore.  It will only query the routers
	   for traffic information and update its rrd databases.

       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)

       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 demmand. Using a cgi script.

       At the moment there is no official script to do this, but two contributers have created
       such scripts:

	   Was the first program to take over the webpage creation and graphing task.  It has
	   been developed by Rainer Bawidamann <Rainer.Bawidamann@informatik.uni-ulm.de>. You can
	   find a copy on Rainers website:


	   The program comes with its own documentation

       routers.cgi, servers.cgi and generic.cgi
	   are other cgi frontends to mrtg running with rrdtool. Thier main difference to 14all
	   is, that the web pages it creates are much more stylish than the ones from mrtg. These
	   tools have been written by Steve Shipway <steve.shipway@adsweu.com>. You can find a
	   copy in


	   The scripts comes with their own installation instructions.

       Just as a side note: MRTG-3 will be based entirely on rrdtool technology.  But don't wait
       for it ... get going now!

       Tobias Oetiker <oetiker@ee.ethz.ch>

3rd Berkeley Distribution		      2.9.17				      MRTG-RRD(1)

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