Xen Template Manager it's intended to be of corse, a template manager that takes
care of the entire process of duplicating the virtual machine template into a new virtual
machine. The template can be any O.S. that Xen can run, paravirtualized and hardware
supported virtual machine. Runs on console and X11.

  It's very simple to use and does not require nothing fancy, you just need a shell
interpreter and dialog, Xdialog or Gdialog.

  Right now I'm studing Python to rewrite XTM, this will allow me to integrate XTM more
easly with Xen since most part of Xen it's written in Python.

Besides nstalling paravirtualized guest systems, Xen can also host fully-virtualized guests on machines with appropriate hardware. This means that you can run unaltered operating systems like CentOS 3 or Microsoft Windows.

This howto describes how you can install a fully-virtualized guest, without using virt-manager, or its console variant virt-install. Often, users require more customizations than these tools provide, so it is usually better to use the tools that lie underneath. This howto uses the virsh tool from the libvirt package, which is a generic tool for management of virtual machines.

We will look at a sample install of CentOS 3. Some potential changes to the configuration are discussed after that.

Modern computers are sufficiently powerful to use virtualization to present the illusion of many smaller virtual machines (VMs), each running a separate operating system instance. Successful partitioning of a machine to support the concurrent execution of multiple operating systems poses several challenges. Firstly, virtual machines must be isolated from one another: it is not acceptable for the execution of one to adversely affect the performance of another. This is particularly true when virtual machines are owned by mutually untrusting users. Secondly, it is necessary to support a variety of different operating systems to accommodate the heterogeneity of popular applications. Thirdly, the performance overhead introduced by virtualization should be small.

Xen™ is a virtual machine monitor for x86 that supports execution of multiple guest operating systems with unprecedented levels of performance and resource isolation. Xen is Open Source software, released under the terms of the GNU General Public License.

The book is targeted at individuals and organizations that are deploying Xen systems. It walks the reader through the basics, from installing Xen to using prebuilt guest images. It even tells readers how to experiment with Xen using only a Xen LiveCD. It covers the basics of virtualizations and important elements of all Xen systems like the hypervisor and Domain0. It explains the details of the xm commands for managing guest domains. It helps users deploy custom guest images based on operating systems from Linux to Windows. It covers more advanced topics like device virtualization, network configuration, security and live migration. We hope you will find it a good mix of introductory and advanced topics that will prove useful from your first Xen deployment experiment to running production Xen systems.

oVirt is a small host image that provides libvirt service and hosts virtual machines and a web-based virtual machine management console. Currently the oVirt Server will only work with the oVirt Node which runs KVM. Patches are welcome to support other hypervisors and work will be underway to support Xen based Nodes in the near future.