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Munin is network monitoring tool for servers. It uses RRDTool, an open source used to generate graphics and logging server activities.

I am installing and configuring munin on centos 5 x86_64 using yum.
1)First of all, we need to add a RPMforge repository.

2)Installing yum

3)chaning the ownership of munin web docroot to munin, as by default it goes to root.

4)Restart Apache and Crond to test the succesful instllation of munin

5)Check if munin is installed up and running
( a trailing slash is needed )
6)Editing munin.conf file

##change htmldir to respecting munin installed directory##
for us it is

##by default the conf file has /var/www/html/munin/##

Thats all is needed for munin installation.

Adding a Node

1) Installing munin-node

2) Staring munin-node daemon

Some configurations on munin.conf for nodes

a host tree for local host

Munin can be used to monitor more than one server from the same place.
For this munin-node needs to be installed on the other servers and host tree should be added on munin.conf .

Few things to keep in mind.

Adding munin-node on chkconfig for all nodes.
Adding Cron for munin on graph server.
Restarting Munin-node after any changes on the files.