We will learn about relocation of domains in Chapter 8.
Clone: Easily add servers by cloning an existing virtual server.
Extend Xen: Xen is open source. You can extend it to do anything that you
need for your specific requirements.
Use as Teaching Aid: Use Xen to set up sandbox environments for students
to learn and interact with operating systems, applications or device drivers.
Create Virtual applications: Create domains that encapsulate a specific
application, such as a web server or a load balancer. You can then reuse these
across the enterprise as needed.
Cluster Servers: Cluster servers to unify multiple servers into a
single system.
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Introduction
[ 10 ]
Xen Terminologies
Following are the definitions for some of the terms used when dealing with
Xen technology:
VM: A virtual machine is the virtualized environment that runs an operating
system so that the user can run their applications on the operating system.
VMM: The software that provides the ability to run virtual machines.
Domain: The term used by Xen to refer to a virtual machine instance.
dom0: The primary domain in a Xen system. This is the operating system
that runs Xen itself.
domU: All the other domains in a Xen system.
Host: The system that provides the environment for running
virtual machines.
Guest: The virtual machine instance that runs on a host system.
PVM: Paravirtualized Virtual machine where the Xen domains can only run
modified operating systems.
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