I'll make this guide quick and straight to the point. Follow these steps and Munin will be up and collecting stats quickly.

Prerequisites:
Apache and MySQL

Assumptions:
You are monitoring the same server that munin is installed on, The server's name is server1.example.com., /var/www = document root

1. Add the RPMforge repository rpm -Uhv http://apt.sw.be/packages/rpmforge-release/rpmforge-release-0.3.6-1.el4....
2. Install munin, munin-node, and dependencies yum -y install munin munin-node
3. Create a directory to serve the Munin site underneath your document root md /var/www/monitor
4. Grant the proper permissions chown munin:munin monitor Note: You may need to adjust the permissions on the parent directory to allow Munin to "see" the monitor directory. chmod 751 /var/www should do the trick
5. Edit the munin.conf file to change the location where munin will serve its files and change the host information vi /etc/munin/munin.conf htmldir /var/www/monitor ... # a simple host tree [server1.example.com] address 127.0.0.1 use_node_name yes

That completes munin and munin-node installation. Now onto the munin-node configuration. By default, Munin doesn't monitor Apache or MySQL. Fortunately it does include the plugins to do so.

1. Create a MySQL user with no permissions to any databases. See the MySQL documentation for more detail. You could use the root account, but I'd advise against that.
2. Edit the munin-node plugin configuration file vi /etc/munin/plugin-conf.d/munin-node [mysql*] env.mysqlopts -u muninuser -pmuninpassword Note: Its important to remember not to put a space between the -p and the password. Your MySQL user account doesn't have to have a password.
3. Create symbolic links to the MySQL and Apache plugins ln -s /usr/share/munin/plugins/apache_* /etc/munin/plugins/ ln -s /usr/share/munin/plugins/mysql_* /etc/munin/plugins/
4. Edit the Apache configuration (httpd.conf) to allow extended status Uncomment the following lines: ExtendedStatus On <Location /server-status> SetHandler server-status Order deny,allow Deny from all Allow from 127.0.0.1 </Location>
5. Add munin-node to the bootup and start the service chkconfig munin-node on service munin-node start

That's it. Sit back and watch Munin do its thing.