Mrtg Installation on centos

This article will describe you Mrtg Installation on centos server.
The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traffic load on network-links.
MRTG generates HTML pages containing PNG images which provide a LIVE visual representation of this traffic. You need the following packages:

NET-SNMP and net-snmp-utils : SNMP (Simple Network Management Protocol) is a protocol used for network management. The NET-SNMP project includes various SNMP tools.

MRTG : Multi Router Traffic Grapher

Step # 1: Install MRTG

Type the following command to install packages using yum command under CentOS / Fedora Linux:

Step # 2: Configure snmpd

If you need to monitor localhost including interface and other stuff such as CPU, memory etc, configure snmpd. Open /etc/snmp/snmpd.conf, enter:

Update it as follows to only allow access from localhost:

Save and close the file. Restart snmpd:

Make sure you see interface IP, by running the following command:

Sample Outputs:

Step # 3: Configure MRTG

Use cfgmaker command to creates /etc/mrtg/mrtg.cfg file, enter:

–global ‘WorkDir: /var/www/mrtg’ : add global config entries i.e. set workdir to store MRTG graphs.
–output /etc/mrtg/mrtg.cfg: configr output filename
public@localhost : public is the community name of the device you want to create a configuration for. If you are using the wrong community name you will get no response from the device. localhost is the DNS name or the IP number of an SNMP-managable device i.e. our local server.

Finally, run indexmaker to create web pages which display the status of an array of mrtg interface status pages:

Step # 4: Verify Cron Job

/etc/cron.d/mrtg runs mrtg command to monitor the traffic load on network links:

Sample Output:

Just make sure crond is running and you are done with configuration:

If it is off in run level # 3, just run the following to turn on crond service:

How do I view mrtg graphs?

You need Apache web server to view graphs, simply type the following to install httpd:

Fire a webbrowser and type the url:
http://your-ip.add.ress/mrtg/

http://192.168.2.5/mrtg/
Fig.01:Sample MRTG Graph

Fig.01:Sample MRTG Graph
How Do I Create MRTG For My Router at 192.168.2.254?

Run cfgmaker as follows (there is no need to configure snmp for router, as most router and switches comes pre configured with their own SNMPD):

OR