How to: Install and Setup XEN Virtualization Software on CentOS Linux 5

One of our regular reader asks:

I’m using CentOS Linux 5 server. How do I set up Xen on Linux ? How do I install guest VPS oses such as Fedora or Windows 2000 or Debian Linux inside XEN?

Xen is a free open source software virtual machine monitor for Intel / PowerPC architectures. It is software that runs on a host operating system and allows several guest operating systems to be run on top of the host on the same computer hardware at the same time (just like VMWare software). Luckily Installing and managing XEN is quite easy under CentOS 5 Linux.

Login as the root and type the following commands:
# yum install xen virt-manager kernel-xen
# chkconfig xend on
# reboot

Make sure you boot CentOS server using XEN kernel.

How do I install NetBSD / any Linux distro / Windows 2000 inside XEN?

Simply use gui tool called virt-manager:
# virt-manager &

CentOS XEN Virtual machine manager

Now just follow on screen instructions to setup new guest operating systems (VPS oses). virt-manager is Xen Management Consoles software. It can perform the common tasks of administering a Xen host such as configuring, starting, monitoring and stopping of Xen guests oses. Please note that above instructions also works on

  • RHEL 5
  • Fedora Linux 7

Installing CentOS 5.3 guest using the Internet

virt-install is a command line tool for provisioning new virtual machines using the “libvirt” hypervisor management library. Type the following command to install CentOS v5.3 64 bit as guest operating system in /vm:
# mkdir /vm
If you are using SELinux, enter:
# semanage fcontext -a -t xen_image_t "/vm(/.*)?"
# restorecon -R /vm
# ls -dZ /vm

Above will provide security context of Xen images. Finally, install CentOS 5.3 using the Internet mirror:
# virt-install \
--paravirt \
--name webserver01 \
--ram 512 \
--file /vm/webserver.nixcraft.com.img \
--file-size 10 \
--nographics \
--location http://mirrors.kernel.org/centos/5.3/os/x86_64/

Above will CentOS as a paravirtualized Xen guest, with 512 MB of RAM, a 10 GB of disk, and from a web server, in text-only mode. You need to just follow on screen instructions.

Fig.01: Centos Xen Virtualization Installation

Once installed you can use xm command to list, start, stop and manage xen vps:
# xen list
Attach console to domain / guest called webserver01:
# xm console webserver01
See xm command cheat sheet.

Installing CentOS 5.3 guest using DVD

Install a CentOS guest, using LVM partition, virtual networking, booting from the host CDROM, using VNC server/viewer (insert DVD into drive):
# virt-install \
--connect qemu:///system \
--name mailserver
--ram 500 \
--file /dev/HostVG/mailserver.cyberciti.biz \
--network network:default \
--accelerate \
--vnc \
--cdrom /dev/cdrom

Note you need qemu and virt-viewer installed on the host system.

Installing Fedora guest using DVD iso image stored on hard disk

Install a Fedora Linux, with a real partition (/dev/sdc), using a local DVD ISO image:
# virt-install \
--name www2 \
--ram 1000 \
--file /dev/sdc \
--network bridge:eth1 \
--cdrom /tmp/fedorabootdvd.iso

Further readings:

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26 comments… add one
  • gulzanesther Aug 22, 2016 @ 11:33

    really good pls help me in programming
    ……with regards
    esther

  • Fasih Apr 20, 2013 @ 6:25

    Well its useful. Let me do this on my CentOS that has a Squid Server, will update you then, See ya soon (Y)

    Fish

  • Farzan Dec 11, 2012 @ 2:15

    No package kernel-xen available.
    Nothing to do

  • Sunil Nov 23, 2011 @ 11:19

    Nice one

  • baker Oct 12, 2011 @ 10:20

    Create a Host and 4 VM Guests using XEN (not Virtual Box):
    a. The Host:
    i. CentOS Linux
    ii. Network address should be: 1.0.0.1
    iii. SSH and VNC should be enabled
    iv. Should be the Gateway to the Internet in both directions for the Guests – so, you shouldn’t be able to access the guests using SSH or VNC directly, you have to access them through the Host only.
    b. The Guests:
    i. RedHat Linux.
    ii. Network address should be: 10.0.0.1
    iii. SSH and VNC should be enabled
    iv. Two Guests should be installed using Para Technique, and two should use the Full Virtualization technique
    v. We need to be able to use HHD for two of them, and LVM for the other two
    vi. Install Apache Web Server on one of the guests – we should be able to access the web server from outside

    plz. some one help me i can do this as a concept 🙂

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