MRTG

MRTG is included in RHEL4; if want to install separately do following:

 create user 'mrtg' with private group 'mrtg'
 mkdir /www/mrtg2.15.0
 chown mrtg.mrtg /www/mrtg2.15.0
 cd /usr/local/src
 chown mrtg.mrtg mrtg-2.15.0
 cd mrtg-2.15.0
 ./configure --prefix=/www/mrtg2.15.0
 make
 make install

Add MRTG-related part to apache config file /www/apache2.2.3/conf/httpd.conf:

 Alias /mrtg "/www/mrtg2.15.0/share"
 <Directory "/www/mrtg2.15.0/share">
   Options Indexes FollowSymLinks
   AllowOverride None
   Order allow,deny
   Allow from all
 </Directory>

NOTE: temporary fix in:

 ERROR: CFG Error in "Interval": should be at least 5 Minutes (unless you use rrdtool)
 at /misc/clonweb/mrtg2.15.0/bin/../lib/mrtg2/MRTG_lib.pm line 772.

MRTG can be started by following command (do not start it yet !):

 env LANG=C /www/mrtg2.15.0/bin/mrtg /www/mrtg2.15.0/etc/mrtg.cfg

Copy contrib/mrtg-startup-script/mrtg to /etc/init.d/ and correct as following (do not forget to make unique second and third number after chkconfig):

 # chkconfig:    345 91 33
 # config:       /www/mrtg2.15.0/etc/mrtg.cfg
 MRTG="/www/mrtg2.15.0/bin/mrtg"
 CONFIG="/www/mrtg2.15.0/etc/mrtg.cfg"

Following commands can be used from now on (do not start it yet !):

 /etc/init.d/mrtg start
 /etc/init.d/mrtg stop
 /etc/init.d/mrtg restart

Add 'mrtg' to the list of services to be started at boot time (enable level 5 only):

 chkconfig --add mrtg
 chkconfig --level 3 mrtg off
 chkconfig --level 4 mrtg off
 chkconfig --list mrtg

Copy/create config files (was copied from clasweb-bck):

 cd /www/mrtg2.15.0
 mkdir etc
 cd /www/mrtg2.15.0/etc
 scp clasweb-bck:/etc/mrtg/"*" .

OR: create configuration files using 'cfgmaker' (never worked for me):

 #example
 #cfgmaker --global 'WorkDir: /home/httpd/mrtg'  \
 #         --global 'Options[_]: bits,growright' \
 #         --output /home/mrtg/cfg/mrtg.cfg    \
 #          community@router.abc.xyz

 DOES NOT WORK YET ...
 /www/mrtg2.15.0/bin/cfgmaker --global 'WorkDir: /www/mrtg2.15.0/etc'  \
        --global 'Options[_]: bits,growright' \
        --output /www/mrtg2.15.0/etc/mrtg.cfg \
        mrtg@clonweb.jlab.org
 DOES NOT WORK YET ...

OR: create configuration files manually (examples from clasweb-bck were used):

 etc/mrtg.cfg - main config file, includes *.inc files
 etc/*.inc - hardware-specific config files

Create 'web' directories:

 cd /www/mrtg2.15.0/share
 mkdir htmls
 mkdir images
 mkdir logs

MRTG will produce and update following files while running:

 share/htmls/*.html - actual html files to be displayed
 share/images/*.png (and *.gif ?) - monthly, dayly and yearly charts
 share/logs/*.log and *.old - current charts

It maybe good idea to copy some old files htmls/*, images/* and logs/* from previously used MRTG (on clasweb-bck in our case). It will preserve history: 'logs/*.log' contains recent history, while images/*.png contains longer history

 cd htmls
 scp clasweb-bck:/var/www/html/mrtg/Hall-B/htmls/* .
 cd ../images
 scp clasweb-bck:/var/www/html/mrtg/Hall-B/images/* .
 cd ../logs
 scp clasweb-bck:/var/www/html/mrtg/Hall-B/logs/* .

Start MRTG rigth the way to avoid interrupts in history:

 /etc/init.d/mrtg start

Generate 'index.html' script in 'share' directory. It will produce file for all channels. It can be splited manually on desired number of smaller files (it maybe possible to generate separate file for every *.inc, but it wanted WorkDir which is defined in mrtg.cfg, and I did not bother to play with it):

 /www/mrtg2.15.0/bin/indexmaker /www/mrtg2.15.0/etc/mrtg.cfg --prefix=htmls --show=none --output=/www/mrtg2.15.0/share/index.html

Cron job (another method to update plots ???):

 [root@clasweb-bck etc]# ll */mrtg
 -rw-r--r--    1 root     root           54 Feb 15  2005 cron.d/mrtg
 -rwxr-xr-x    1 vvsap    clas         1140 Mar  2  2005 init.d/mrtg
 [root@clasweb-bck etc]# more  cron.d/mrtg
 #0-59/5 * * * * root /usr/bin/mrtg /etc/mrtg/mrtg.cfg