[root@ruo91 ~]# yum install -y kernel-xen xen

[root@ruo91 ~]# vi /boot/grub/menu.lst

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-164.11.1.el5xen)
        root (hd0,0)
        kernel /xen.gz-2.6.18-164.11.1.el5
        module /vmlinuz-2.6.18-164.11.1.el5xen ro root=/dev/VolGroup00/LogVol00
        module /initrd-2.6.18-164.11.1.el5xen.img
title CentOS (2.6.18-164.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-164.el5 ro root=/dev/VolGroup00/LogVol00
        initrd /initrd-2.6.18-164.el5.img

[root@ruo91 ~]# reboot

[root@ruo91 ~]# xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
Domain-0                                   0      879     1 r-----    170.7

[root@ruo91 ~]# mkdir /vm

[root@ruo91 ~]# virt-install -n CentOS_5.4 --prompt consol
How much RAM should be allocated (in megabytes)? 256
 What would you like to use as the disk (file path)? /vm/CentOS_5.4.img
 What is the install URL? http://centos.mirror.cdnetworks.com/5.4/os/i386


Starting install...
Retrieving file .treeinfo...                                                              |  413 B     00:00
Retrieving file vmlinuz...                                                               | 2.1 MB     00:00
Retrieving file initrd.img...                                                             | 6.6 MB     00:00
Creating domain...                                                                      |    0 B     00:04
Connected to domain CentOS_5.4
Escape character is ^]
Linux version 2.6.18-164.el5xen (mockbuild@builder16.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) #1 SMP Thu Sep 3 04:47:32 EDT 2009
..........................
..............................

-n : 가상 OS 이름
-v : 전 가상화 (Full virtualization)
-p : 반 가상화 (Para virtualization)
--prompt consol : 콘솔 기반으로 설치

How much RAM should be allocated (in megabytes)?
-> 가상 OS에 메모리 용량을 얼마나 줄것인지.. 기본 MB(메가바이트) 단위
 What would you like to use as the disk (file path)?
-> 가상 OS의 이미지 파일이 저장될 경로
 What is the install URL?
-> 미러링 서버로 설치 하기 위한 주소

XEN 을 이용한 가상 OS 를 확인 해봅니다.

[root@ruo91 ~]# xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
CentOS_5.4                                 4      255     1 -b----    259.7
Domain-0                                   0      747     1 r-----   2693.5