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Thread: How to Install and Configure MRTG on CentOS?

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    Exclamation How to Install and Configure MRTG on CentOS?

    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 the traffic.


    mrtg : Multi Router Traffic Grapher
    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. net-snmp package contains the snmpd and snmptrapd daemons, documentation, etc. You also want to install the net-snmp-utils package, which contains NET-SNMP utilities.

    This FAQ works with RHEL / CentOS and Fedora Linux.


    Step # 1: Install MRTG

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

    Code:
    # yum install mrtg net-snmp net-snmp-utils

    Step # 2: Configure snmpd

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

    Code:
    # vi /etc/snmpd/snmpd.conf
    Update it as follows to only allow access from localhost:

    Code:
    com2sec local     localhost           public
    group MyRWGroup v1         local
    group MyRWGroup v2c        local
    group MyRWGroup usm        local
    view all    included  .1                               80
    access MyRWGroup ""      any       noauth    exact  all    all    none
    syslocation VSNL, India
    syscontact Root <techs@zipsupport.com>
    Save and close the file. Restart snmpd:
    Code:
    # chkconfig snmpd on
    # service snmpd restart

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

    Code:
    # snmpwalk -v 1 -c public localhost IP-MIB::ipAdEntIfIndex
    Sample Outputs:

    Code:
    IP-MIB::ipAdEntIfIndex.123.xx.yy.zzz = INTEGER: 2
    IP-MIB::ipAdEntIfIndex.127.0.0.1 = INTEGER: 1

    Step # 3: Configure MRTG

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

    Code:
    # cfgmaker --global 'WorkDir: /var/www/mrtg' --output /etc/mrtg/mrtg.cfg public@localhost
    * --global 'WorkDir: /var/www/mrtg' : add global config entries i.e. set workdir to store MRTG graphs.

    * --output /etc/mrtg/mrtg.cfg: configure 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:

    Code:
    # indexmaker --output=/var/www/mrtg/index.html /etc/mrtg/mrtg.cfg

    Step # 4: Verify Cron Job

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

    Code:
    # cat /etc/cron.d/mrtg
    Sample Output:

    Code:
    */5 * * * * root LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lock/mrtg/mrtg_l --confcache-file /var/lib/mrtg/mrtg.ok
    Just make sure crond is running and you are done with configuration:

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

    Code:
    # chkconfig crond on
    # service crond on
    How do I view mrtg graphs?

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

    Code:
    # yum install httpd
    # chkconfig httpd on
    # service httpd on
    Fire a webbrowser and type the url:
    Code:
    http://your-ip.add.ress/mrtg/
    http://192.168.1.1/mrtg/




    How Do I Create MRTG For My Router at 192.168.1.254?

    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):

    Code:
    # cfgmaker --global 'WorkDir: /var/www/mrtg' --output /etc/mrtg/mrtg.cfg public@router
    OR

    Code:
    # cfgmaker --global 'WorkDir: /var/www/mrtg' --output /etc/mrtg/mrtg.cfg public@192.168.1.254
    Reference :: http://www.cyberciti.biz


    Last edited by James007; 07-30-2009 at 11:26 PM.
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