Configuring MRTG and NET-SNMP for monitoring Linux System Parameters

Configuration:
MRTG ver. 2.97
Net-SNMP ver. 4.2.6
OS : RedHat Linux 7.3

This doc should help you with configuring a RedHat Linux box for monitoring system parameters (local/remote), using Net-SNMP and MRTG.

About MRTG and Net-SNMP

MRTG (Multi-Router Traffic Grapher)
The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traffic load on network-links. MRTG generates HTML pages containing graphical images which provide a LIVE visual representation of this traffic.
Check http://www.ee.ethz.ch/stats/mrtg/ for an example.
MRTG is based on Perl and C and works under UNIX and Windows NT.
MRTG is being successfully used on many sites around the net

Net-SNMP

Net-SNMP is a collection of various tools relating to the Simple Network Management Protocol including:

* An extensible agent
* An SNMP library
* tools to request or set information from SNMP agents
* tools to generate and handle SNMP traps
* a version of the unix ‘netstat’ command using SNMP
* a graphical Perl/Tk/SNMP based mib browser


Configuring SNMP Daemon
(Note: This doc does NOT talk about running the SNMP daemon securely. Please refer the SNMP docs for it)

as root,
1) edit /etc/snmp/snmpd.conf, and add the following:
rocommunity public
2) then, in the section “process checks”, edit
#proc mountd

to

proc httpd ( if you want to monitor httpd processes)

or

proc java ( if you want to monitor java processes)

3) then, in section “disk checks”, edit/add

disk /
disk /var

( to monitor / and /var partitions)

4) restart SNMP daemon
# /etc/rc.d/init.d/snmpd restart

5) now, SNMP is running with a read-only community string of public to answer snmp queries

Running MRTG

here is the MRTG configuration file. Customize it to suit your requirements.

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