Very clear instruction can be found at Virtualization Guide
However during installation, I encounter a error where somehow I cannot install Media URL. I've tried NFS, but it didn't work.
To resolve this issue, look at the CentOS Discussion Forum. Initially I tried to use iso image but couldn't get it to work
- Start the Apache Service
- Place the CentOS DVD Disk into the Drive
- Do a Softlink from "ln -s /media/CentOS_5.2_Final /var/www/html/dvd"
- Of course first check that you can see the http://127.0.0.1/dvd
- Run Virt-Manager
The rest will be quite a breeze