1. 安装 Xen
Red Hat 公司在 RHEL5 版本的 Linux 操作系统中正式加入了对 Xen 虚拟技术的支持。而在RHEL5 之前的 Linux 系统中安装 Xen 需要进行编译内核的工作，安装过程较为繁琐和复杂。
在 RHEL5 中安装 Xen 有多种方式：
方法一：在 RHEL5 安装时输入包含支持 virtualization 的功能的安装号，系统默认会自动安装Xen 相关软件包。
方法二：在 RHEL5 的安装光盘中已包含全部 Xen 的软件包，所以完全可以手动安装 RHEL5安装光盘中的 Xen 相关软件包，由于需要安装软件包较多，此方法比较繁琐，不建议初学者使用。
方法三：在能连入互联网的前提下，使用 RHEL5 订阅号，利用 yum 工具安装 Xen 内核补丁、Xen 虚拟机、virt-manager 虚拟化管理工具。
方法四：利用 RHEL5 的 DVD 安装光盘构建本地 yum 安装源，利用 yum 工具安装 Xen 内核补丁、Xen 虚拟机、virt-manager 虚拟化管理工具。
这里推荐使用第四种方法进行安装。
现在以一个已安装 GNOME 图形桌面，已安装 Apache，但没有安装任何 Xen 软件的 RHEL5系统为例讲解如何安装 Xen 虚拟化软件。
首先参照 http://jiayf.blog.51cto.com/1659430/342416 构建本地 yum 安装源，过程这里不再赘述。构建完成后执行以下命令安装 Xen 内核补丁、Xen 虚拟机、virt-manager 虚拟化管理工具
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[root@xen ~]# yum install kernel-xen xen virt-manager
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Cluster | 1.3 kB 00:00
Cluster/primary | 6.5 kB 00:00
Cluster 32/32
ClusterStorage | 1.3 kB 00:00
ClusterStorage/primary | 8.8 kB 00:00
ClusterStorage 39/39
VT | 1.3 kB 00:00
VT/primary | 9.0 kB 00:00
VT 36/36
Setting up Install Process
Package kernel-xen-2.6.18-164.el5.i686 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package virt-manager.i386 0:0.6.1-8.el5 set to be updated
--> Processing Dependency: gnome-python2-gnomekeyring >= 2.15.4 for package: virt-manager
--> Processing Dependency: gtk-vnc-python >= 0.3.8 for package: virt-manager
--> Processing Dependency: libvirt-python >= 0.3.3 for package: virt-manager
--> Processing Dependency: python-virtinst >= 0.400.3 for package: virt-manager
---> Package xen.i386 0:3.0.3-94.el5 set to be updated
--> Processing Dependency: xen-libs = 3.0.3-94.el5 for package: xen
--> Processing Dependency: libxenctrl.so.3.0 for package: xen
--> Processing Dependency: libfsp_w_picpath.so.1.0 for package: xen
--> Processing Dependency: libxenguest.so.3.0 for package: xen
--> Processing Dependency: libxenstore.so.3.0 for package: xen
--> Processing Dependency: bridge-utils for package: xen
--> Processing Dependency: libblktap.so.3.0 for package: xen
--> Processing Dependency: libfsp_w_picpath.so.1.0(libfsp_w_picpath.so.1.0) for package: xen
--> Running transaction check
---> Package bridge-utils.i386 0:1.1-2 set to be updated
---> Package gnome-python2-gnomekeyring.i386 0:2.16.0-3.el5 set to be updated
---> Package gtk-vnc-python.i386 0:0.3.8-3.el5 set to be updated
--> Processing Dependency: gtk-vnc = 0.3.8-3.el5 for package: gtk-vnc-python
--> Processing Dependency: libgtk-vnc-1.0.so.0 for package: gtk-vnc-python
---> Package libvirt-python.i386 0:0.6.3-20.el5 set to be updated
--> Processing Dependency: libvirt = 0.6.3-20.el5 for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.6.1) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.2.3) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.1.1) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.1.9) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.2.1) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.4.5) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.2.0) for package: libvirt-python
--> Processing Dependency: libvirt.so.0 for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.1.5) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.4.1) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.1.0) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.3.3) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.6.3) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.6.0) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.4.0) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.5.0) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.1.4) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.3.0) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.3.2) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.0.3) for package: libvirt-python
--> Processing Dependency: libvirt.so.0(LIBVIRT_0.0.5) for package: libvirt-python
---> Package python-virtinst.noarch 0:0.400.3-5.el5 set to be updated
---> Package xen-libs.i386 0:3.0.3-94.el5 set to be updated
--> Running transaction check
---> Package gtk-vnc.i386 0:0.3.8-3.el5 set to be updated
---> Package libvirt.i386 0:0.6.3-20.el5 set to be updated
--> Processing Dependency: cyrus-sasl-md5 for package: libvirt
--> Processing Dependency: iscsi-initiator-utils for package: libvirt
--> Running transaction check
---> Package cyrus-sasl-md5.i386 0:2.1.22-5.el5 set to be updated
---> Package iscsi-initiator-utils.i386 0:6.2.0.871-0.10.el5 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository
Size
================================================================================
Installing:
virt-manager i386 0.6.1-8.el5 VT 1.5 M
xen i386 3.0.3-94.el5 VT 1.9 M
Installing for dependencies:
bridge-utils i386 1.1-2 Server 28 k
cyrus-sasl-md5 i386 2.1.22-5.el5 Server 45 k
gnome-python2-gnomekeyring i386 2.16.0-3.el5 Server 16 k
gtk-vnc i386 0.3.8-3.el5 Server 80 k
gtk-vnc-python i386 0.3.8-3.el5 Server 12 k
iscsi-initiator-utils i386 6.2.0.871-0.10.el5 Server 773 k
libvirt i386 0.6.3-20.el5 VT 1.9 M
libvirt-python i386 0.6.3-20.el5 VT 132 k
python-virtinst noarch 0.400.3-5.el5 VT 378 k
xen-libs i386 3.0.3-94.el5 Server 154 k
Transaction Summary
================================================================================
Install 12 Package(s)
Update 0 Package(s)
Remove 0 Package(s)
Total download size: 6.9 M
Is this ok [y/N]: y
Downloading Packages:
(1/12): iscsi-initiator-utils-6.2.0.871-0.10.el5.i386.rp | 773 kB 00:00
(2/12): bridge-utils-1.1-2.i386.rpm | 28 kB 00:00
(3/12): gtk-vnc-python-0.3.8-3.el5.i386.rpm | 12 kB 00:00
(4/12): xen-libs-3.0.3-94.el5.i386.rpm | 154 kB 00:00
(5/12): cyrus-sasl-md5-2.1.22-5.el5.i386.rpm | 45 kB 00:00
(6/12): gtk-vnc-0.3.8-3.el5.i386.rpm | 80 kB 00:00
(7/12): xen-3.0.3-94.el5.i386.rpm | 1.9 MB 00:00
(8/12): gnome-python2-gnomekeyring-2.16.0-3.el5.i386.rpm | 16 kB 00:00
(9/12): libvirt-python-0.6.3-20.el5.i386.rpm | 132 kB 00:00
(10/12): virt-manager-0.6.1-8.el5.i386.rpm | 1.5 MB 00:00
(11/12): libvirt-0.6.3-20.el5.i386.rpm | 1.9 MB 00:00
(12/12): python-virtinst-0.400.3-5.el5.noarch.rpm | 378 kB 00:00
--------------------------------------------------------------------------------
Total 2.3 MB/s | 6.9 MB 00:02
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : xen-libs 1/12
Installing : bridge-utils 2/12
Installing : gtk-vnc 3/12
Installing : gtk-vnc-python 4/12
Installing : cyrus-sasl-md5 5/12
Installing : iscsi-initiator-utils 6/12
Installing : libvirt 7/12
Installing : libvirt-python 8/12
Installing : gnome-python2-gnomekeyring 9/12
Installing : python-virtinst 10/12
Installing : xen 11/12
Installing : virt-manager 12/12
Installed:
virt-manager.i386 0:0.6.1-8.el5 xen.i386 0:3.0.3-94.el5
Dependency Installed:
bridge-utils.i386 0:1.1-2 cyrus-sasl-md5.i386 0:2.1.22-5.el5
gnome-python2-gnomekeyring.i386 0:2.16.0-3.el5 gtk-vnc.i386 0:0.3.8-3.el5
gtk-vnc-python.i386 0:0.3.8-3.el5 iscsi-initiator-utils.i386 0:6.2.0.871-0.10.el5
libvirt.i386 0:0.6.3-20.el5 libvirt-python.i386 0:0.6.3-20.el5
python-virtinst.noarch 0:0.400.3-5.el5 xen-libs.i386 0:3.0.3-94.el5
Complete!
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重新启动系统
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[root@xen ~]# init 6
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2. Xen 服务控制命令
Xen 是由一个叫做 xend 后台守护进程维护，要运行虚拟系统，必须先将其启动。Xen 的配置文件是/etc/xen/xend-config.sxp，内容包括宿主系统的类型，网络的连接结构、宿主操作系统的资源使用设定，以及 vnc 连接的一些内容，一般不需要对其进行设置，如果要添加新的网络设备（比如新的虚拟网卡），则需要在 xend-config.sxp 文件中添加新的设备内容。
启动 xend 的命令
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[root@xen ~]# /etc/init.d/xend start
启动 xend： [确定]
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停止 xend 的命令
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[root@xen ~]# /etc/init.d/xend stop
停止 xend： [确定]
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重新启动 xend 的命令
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[root@xen ~]# /etc/init.d/xend restart
restart xend: [确定]
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将 xend 服务设置成开机自启动
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[root@xen ~]# chkconfig --add xend
[root@xen ~]# chkconfig --add xendomains
[root@xen ~]# chkconfig --level 345 xend on
[root@xen ~]# chkconfig --level 345 xendomains on
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