View source for Basic MRTG configuration for monitoring network interfaces

[[Main Page|Home]] > [[CentOS]] > [[CentOS 6.x]] > [[Monitoring tools]] > [[MRTG configuration]] > [[Basic MRTG configuration for monitoring network interfaces]]

'''Use of [[cacti]] is recommended over trying to use MRTG'''


Steps to configure basic MRTG based monitoring server are:
#Use command '<tt>snmpwalk -v 1 -c &lt;community&gt; &lt;hostname&gt; IP-MIB::ipAdEntIfIndex</tt>' to query SNMP server and list set of IP addresses assigned to host / router. If it does not lists anything then we need to configure SNMP server for hosts as mentioned at [[SNMP server configuration for Linux hosts]] or for switches as mentioned at [[Configuring cisco switch as SNMP server ]]
#Ensure that package 'mrtg' is installed.
#For each host to be monitored follow these steps:
##Create host specific document root using '<tt>mkdir /var/www/html/&lt;IP or name&gt;</tt>'
##Create configuration file using
##:<pre> 
##::cfgmaker --global 'WorkDir: /var/www/html/<IP or name>' --output /etc/mrtg/<IP or name>.cfg <community>@<IP or FQDN>
##:</pre>
##Create index page for MRTG configuration
##:<pre>
##::indexmaker --output=/var/www/html/<IP or name>/index.html /etc/mrtg/<IP or name>.cfg
##:</pre>
##Copy mrtg png files to document root using '<tt>cp /var/www/mrtg/* /var/www/html/&lt;IP or name&gt;/</tt>'
##Run mrtg few times using: 
##:<pre>
##::env LANG=C /usr/bin/mrtg /etc/mrtg/<IP or name>.cfg
##:</pre>
##:ignore errors shown during first few runs
## Use '<tt>service httpd start</tt>' to start web server if it is not already running.
## Test pages by visiting '<tt>http://&lt;MRTG server IP&gt;/&lt;Monitored host IP or name&gt;/index.html</tt>'
## If everything is fine add following cron entry using '<tt>crontab -e</tt>' command
##:<pre>
##:: */5 * * * * env LANG=C /usr/bin/mrtg /etc/mrtg/<IP or name>.cfg   -logging /var/log/mrtg.log
##:</pre>
##Optionally restrict to MRTG graphs using apache '<tt>.htaccess</tt>' configuration. Create file '<tt>/var/www/html/&lt;IP or NAME&gt;/.htaccess</tt>' with following lines
##:<pre>
##::AuthName "MRTG Graphs/Html restricted access"
##::AuthType Basic
##::AuthUserFile /var/members/.htpasswd
##::require user mrtgadmin
##:</pre>
##To create '<tt>/var/members/.htpasswd</tt>' file use: (one time only)
##:<pre>
##::htpasswd -c /var/members/.htpasswd mrtgadmin
##:</pre>
## In case server is not asking password then add following to '<tt>/etc/httpd/conf/httpd.conf</tt>'
##:<pre>
##::<Directory "/var/www/html/<IP or Name>">
##::	Options All
##::	AllowOverride All
##::</Directory>
##:</pre>
##:and then do '<tt>service httpd reload</tt>'
		

Note: Running MRTG like this is not efficient. One should use '<tt>rrdtool</tt>' if we want to monitor many different hosts using MRTG.

Steps have been learned from http://www.cyberciti.biz/nixcraft/linux/docs/uniqlinuxfeatures/mrtg/



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