Installing Xen dom0 on Ubuntu 9.04

The overall structure of a 'Xen-enabled' system can be visualized by the following figure:

As shown in the figure, and contrary to my prior belief, Xen hypervisor is represented by another GRUB entry at system boot time (as opposed to simply replacing the OS that it was installed from). As a result, you can choose to boot into original OS without Xen availability or into the Xen system even after you have installed Xen on given system. This was just used to show a high-level picture of system layout...

Following are a set of commands that will install Xen hypervisor. These commands are to be executed within the original OS currently existing on the machine:
$ wget http://http.us.debian.org/debian/pool/main/l/linux-2.6/linux-image-2.6.26-2-xen-686_2.6.26-19_i386.deb
$ wget http://http.us.debian.org/debian/pool/main/l/linux-2.6/linux-modules-2.6.26-2-xen-686_2.6.26-19_i386.deb
$ sudo dpkg -i linux-modules-2.6.26-2-xen-686_2.6.26-19_i386.deb
$ sudo dpkg -i linux-image-2.6.26-2-xen-686_2.6.26-19_i386.deb
$ sudo apt-get install ubuntu-xen-server

Then, restart the machine and in the grub loader, Xen should appear as a bootable OS.

After booting up, the following command should tell you that you are in dom0:

$ sudo xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 702 1 r----- 312.9

When it comes to installing guest OS's (i.e., domU's), the following websites were helpful:

• A brief and technical process can be found here
• The same process but where each step is explained in more detail can be found here
• Another example process that shows contents of many files that need to be edited can be found he