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



NNAAMMEE
       mrtg-rrd - How to use RRDtool with MRTG

SSYYNNOOPPSSIISS
       After using MRTG for some time you may find some limita-
       tions, mostly in the areas of performance and graphing
       flexibility. These are exactly the areas addressed by RRD-
       tool. To learn more about RRDtool check out its website on

        http://people.ee.ethz.ch/~oetiker/webtools/rrdtool

RRRRDDTTOOOOLL IINNTTEEGGRRAATTIIOONN
       When using mrtg with RRDtool you are replacing _r_a_t_e_u_p with
       the RRDtool perl module _R_R_D_s_._p_m. To enable RRDtool support
       in mrtg you have to add the line

        LogFormat: rrdtool

       to your mrtg config file.

       MRTG needs access to both the RRDtool perl module RRRRDDss..ppmm
       and to the rrrrddttooooll executable.

       If these two items are not installed in locations where
       perl can find them on its own, then you can use the fol-
       lowing two parameters to supply the appropriate directo-
       ries.

       For the location of the rrrrddttooooll executable you put

        PathAdd: /usr/local/rrdtool/bin/

       or

        PathAdd: c:\rrdtool\bin

       For the location of the perl module it would be:

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

       or

        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 ccoonnvveerrtt
           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 rrrrddttooooll to update its databases. These
           will have a new format called _r_r_d which is totally
           different than the native _l_o_g format of the classic
           mrtg.

       3.  mrtg will nnoott create any webpages of graphs anymore.
           It will only query the routers for traffic information
           and update its _r_r_d databases.

       The advantage of whole thing is that the mrtg will become
       mmuucchh faster. Expect the runtime to drop to 20% of the pre-
       vious 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
       vveerryy fast, you are also gaining some time by neither cre-
       ating 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 ooffffiicciiaall 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 rainer.bawidamann@web.de. You can
           find a copy on Rainers website: http://my14all.source-
           forge.net/ The program comes with its own documenta-
           tion

       rroouutteerrss..ccggii,, sseerrvveerrss..ccggii aanndd ggeenneerriicc..ccggii
           These are other cgi frontends to 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. These tools have been written
           by Steve Shipway steve@steveshipway.org. You can find
           a copy in http://www.steveshipway.org/software/ The
           programs come with their own installation instruc-
           tions.

       mmrrttgg--rrrrdd
           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 replace-
           ment for the 14all.cgi script. It can make your moni-
           toring 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/

       Paul C. Williamson has written a more in-depth page on how
       the whole process works, including some performance fig-
       ures. You can find his page on

        http://www.geocities.com/paulcwilliamson/mrtg/rateup2rrd.html

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

AAUUTTHHOORR
       Tobias Oetiker <oetiker@ee.ethz.ch>



2.13.2                      2006-02-03                MRTG-RRD(1)
