Here is a quick how to for installing centOS 5.1 in a domU, this is a netinstall so all thats required is a kernel and a ramdisk. The latest release is 5.1 and i’m in the uk so I’m using the UK mirror.
The Kernel and ramdisk are found here, download these using wget or any of your favourite methods and place somewhere in your dom0. In my templates folder/xen you will find a simple template for a centos config, change the paths to match your kernel and ramdisk… you’ll also need to change the disk to whatever you’re using, disk image or another LV.
then xm create -c <centos_config> and you’re away.
The templates folder can be found here.