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Xen虚拟化进阶篇 Xen平台下虚拟机的实时迁移

Xen的虚拟机的实时迁移简介

Xen为我们提供了一种强大的功能,它就是动态迁移法。它能让Domain在运行期间,以最小的服务中断为代价,将Domain迁移到另外的Xen 服务器上。

使用Xen动态迁移的主要优点列举如下:

1.Xen的动态迁移随同诸如heartbeat之类的高可用性解决方案一起使用,能给我们带来一个“永不抛锚”的系统。最新版本的Enterprise SUSE Linux Server 和Red Hat EnterpriseLinux 也是利用Xen来提供各种高可用性解决方案的。您可以轻而易举的满足各种服务的苛刻要求,同时还能保证所有关键商业服务不会出现中断。
2.它使我们能够以“治未病”方式来维护寄放虚拟机的物理服务器。您可以监视服务器,然后通过转移系统来即时解决潜在的和可疑的问题。
3.它使得在多个服务器之间实现负载均衡成为可能,使我们能够更好地利用企业中的所有计算资源,使其利用情况达到最佳状态。需要注意的是,Xen的开源版本目前还不支持在dom0上感应到故障时自动进行动态迁移的功能。
4.它使得在需要时向系统配置添加计算能力变得更加轻松。
5.您可以根据需要更换硬件,而无需中断运行在该硬件上的服务。

只知道动态迁移的好处还不够,现在就实现Xen的动态实时迁移。

实验介绍:

1.存在一台iSCSI共享存储,iSCSI存储被两台Xen虚拟化平台使用;
2.实验环境存在两台Xen的虚拟化平台,其中一个虚拟化平台上存在一个简单的busybox虚拟机,其映像文件存放在iSCSI共享存储上;这里我在两个虚拟化平台都做了简单的busybox虚拟机;
3.在Xen虚拟化平台间实现实时迁移其中一台busybox虚拟机实例;

实验架构图:

Xen虚拟化进阶篇 Xen平台下虚拟机的实时迁移

实验实现:

一.构建iSCSI共享存储
1.iSCSI服务器构建

格式化磁盘:
# echo -n -e"n\np\n3\n\n+5G\nt\n3\n8e\nw\n" |fdisk /dev/sda
# partx -a /dev/sda
# fdisk -l /dev/sda3
 
Disk /dev/sda3: 5378 MB, 5378310144 bytes
255 heads, 63 sectors/track, 653 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

安装iSCSI服务器端软件:

# yum install -y scsi-target-utils

编辑iSCSI服务器的配置文件:

# vim /etc/tgt/targets.conf
#添加如下内容;
<target iqn.2015-02.com.stu31:t1>
    backing-store /dev/sda3
    initiator-address 172.16.31.0/24
</target>

配置完成后即可启动iscsi服务器:

# service tgtd start

查看共享设备:

# tgtadm --lld iscsi -m target -o show
Target 1: iqn.2015-02.com.stu31:t1
  System information:
    Driver: iscsi
    State: ready
  I_T nexus information:
  LUN information:
    LUN: 0
      Type: controller
      SCSI ID: IET   00010000
      SCSI SN: beaf10
      Size: 0 MB, Block size: 1
      Online: Yes
      Removable media: No
      Prevent removal: No
      Readonly: No
      Backing store type: null
      Backing store path: None
      Backing store flags:
    LUN: 1
      Type: disk
      SCSI ID: IET   00010001
      SCSI SN: beaf11
      Size: 5378 MB, Block size: 512
      Online: Yes
      Removable media: No
      Prevent removal: No
      Readonly: No
      Backing store type: rdwr
      Backing store path: /dev/sda3
      Backing store flags:
  Account information:
  ACL information:
    172.16.31.0/24

2.iSCSI客户端的安装和配置

两个Xen虚拟化平台节点安装iSCSI客户端软件:

#yum install -y iscsi-initiator-utils

启动iSCSI客户端:

# service iscsi start
# service iscsid start

让客户端发现iSCSI服务器共享的存储:

# iscsiadm -m discovery -t st -p172.16.31.3
172.16.31.3:3260,1 iqn.2015-02.com.stu31:t1

注册iscsi共享设备,节点登录,

# iscsiadm -m node -Tiqn.2015-02.com.stu31:t1 -p 172.16.31.3 -l
Logging in to [iface: default, target:iqn.2015-02.com.stu31:t1, portal: 172.16.31.3,3260] (multiple)
Login to [iface: default, target:iqn.2015-02.com.stu31:t1, portal: 172.16.31.3,3260] successful.

查看iSCSI存储:

# fdisk -l /dev/sdb
 
Disk /dev/sdb: 5378 MB, 5378310144 bytes
166 heads, 62 sectors/track, 1020 cylinders
Units = cylinders of 10292 * 512 = 5269504bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

登录后就可以格式化磁盘和分区了:

# echo -e "n\np\n1\n\n+2G\nw\n"|fdisk /dev/sdb
# partx -a /dev/sdb
查看格式化后的磁盘:
# fdisk -l /dev/sdb
 
Disk /dev/sdb: 5378 MB, 5378310144 bytes
166 heads, 62 sectors/track, 1020 cylinders
Units = cylinders of 10292 * 512 = 5269504bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x8e1d9dd0
 
 Device Boot   Start     End   Blocks Id System
/dev/sdb1        1     409  2104683  83 Linux

二.客户端节点Xen虚拟化环境构建

由于是两个Xen虚拟化节点,我这里已经有一个现成的ok的Xen虚拟化节点,我们再添加一个虚拟化节点,当作事例提供;
1.配置xen的yum源

# vim /etc/yum.repos.d/xen4.repo
[xen4]
name=Xen4 For CentOS6
baseurl=ftp://172.16.0.1/pub/Sources/6.x86_64/xen4centos/x86_64/
gpgcheck=0
清空现有yum库缓存:
# yum clean all

2.安装xen-4.2.5版本的软件,更新内核版本到3.7.10
# yum install -y xen-4.2.5 xen-libs-4.2.5xen-runtime-4.2.5 kernel-xen

3.配置grub.conf配置文件

# vim /etc/grub.conf
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.7.10-1.el6xen.x86_64)
    root (hd0,0)
    kernel /xen.gz dom0_mem=1024M,max:1024M dom0_max_vcpus=1 dom0_vcpus_pin
cpufreq=xen
    module /vmlinuz-3.7.10-1.el6xen.x86_64 ro root=/dev/mapper/vg0-rootrd_NO_LUKS rd_NO_DM.UTF-8 rd_LVM_LV=vg0/swap rd_NO_MDSYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=vg0/root KEYBOARDTYPE=pc KEYTABLE=us rhgbcrashkernel=auto quiet rhgb quiet
    module /initramfs-3.7.10-1.el6xen.x86_64.img
title CentOS 6 (2.6.32-504.el6.x86_64)
    root (hd0,0)
    kernel /vmlinuz-2.6.32-504.el6.x86_64 ro root=/dev/mapper/vg0-rootrd_NO_LUKS rd_NO_DM.UTF-8 rd_LVM_LV=vg0/swap rd_NO_MDSYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=vg0/root KEYBOARDTYPE=pc KEYTABLE=us rhgbcrashkernel=auto quiet rhgb quiet
    initrd /initramfs-2.6.32-504.el6.x86_64.img

配置完成后重新启动Linux系统,启动完成后自动进入了Xen的Dom0环境:
查看内核版本,已经升级到3.7.10:

# uname -r
3.7.10-1.el6xen.x86_64

查看xen的xend服务开机启动项:

# chkconfig --list xend
xend 0:off 1:off 2:off 3:on 4:on 5:on 6:off

4.启动xend服务
# service xend start

可以查看一下现在运行的虚拟机:

# xm list
Name                    ID  Mem VCPUs   State Time(s)
Domain-0                   0 1024  1   r-----   23.7

查看一下Xen虚拟机的信息:

# xm info
host          : test2.stu31.com
release        : 3.7.10-1.el6xen.x86_64
version        : #1 SMP Thu Feb 5 12:56:19 CST2015
machine        : x86_64
nr_cpus        : 1
nr_nodes        : 1
cores_per_socket    : 1
threads_per_core    :1
cpu_mhz        : 2272
hw_caps        :078bfbff:28100800:00000000:00000140:00000209:00000000:00000001:00000000
virt_caps       :
total_memory      : 2047
free_memory      : 998
free_cpus       : 0
xen_major       : 4
xen_minor       : 2
xen_extra       : .5-38.el6
xen_caps        : xen-3.0-x86_64 xen-3.0-x86_32p
xen_scheduler     : credit
xen_pagesize      : 4096
platform_params    : virt_start=0xffff800000000000
xen_changeset     : unavailable
xen_commandline    : dom0_mem=1024M,max:1024Mdom0_max_vcpus=1 dom0_vcpus_pin cpufreq=xen
cc_compiler      : gcc (GCC) 4.4.7 20120313 (Red Hat4.4.7-11)
cc_compile_by     : mockbuild
cc_compile_domain   :centos.org
cc_compile_date    : Tue Jan 6 12:04:11 CST 2015
xend_config_format   : 4

iSCSI客户端配置发现iSCSI服务器的共享存储依据上面的配置即可(配置略);

三.在Xen虚拟化环境上构建虚拟机busybox

只需要在其中一个节点构建即可;
1.将iSCSI共享存储作为虚拟机的磁盘存放路径

格式化共享存储:
# mke2fs -t ext4 /dev/sdb1
创建目录,将存储挂载上:
# mkdir /scsistore
# mount /dev/sdb1 /scsistore/
 
进入目录创建虚拟机磁盘设备:
# cd /scsistore
# dd if=/dev/zero of=./busybox.img bs=1Moflag=direct seek=1023 count=1
查看设备大小,可以发现实际大小才1MB:
# ll -h
total 1.1M
-rw-r--r-- 1 root root 1.0G Feb 6 20:17 busybox.img
drwx------ 2 root root 16K Feb 6 20:05 lost+found
格式化虚拟磁盘设备:
# mke2fs -t ext4 /scsistore/busybox.img
mke2fs 1.41.12 (17-May-2010)
/scsistore/busybox.img is not a blockspecial device.
Proceed anyway"htmlcode">
编译环境需要的开发包组安装:
# yum groupinstall -y Developmenttools 
# yum install -y ncurses-devel glibc-static
 
获取busybox软件:
busybox-1.22.1.tar.bz2
 
编译安装busybox:
# tar xf busybox-1.22.1.tar.bz2
# cd busybox-1.22.1
# make menuconfig

配置如下图所示:

Xen虚拟化进阶篇 Xen平台下虚拟机的实时迁移
Xen虚拟化进阶篇 Xen平台下虚拟机的实时迁移
Xen虚拟化进阶篇 Xen平台下虚拟机的实时迁移
Xen虚拟化进阶篇 Xen平台下虚拟机的实时迁移

设置完成后进行编译和安装:

# make && make install

编译安装busybox完成后在这个目录会生成安装好的文件_install目录,我们将_install目录拷贝到挂载的虚拟磁盘中:

# cp -a _install/* /mnt
# cd /mnt
# ls
bin linuxrc lost+found sbin usr
# rm -rf linuxrc
# mkdir dev proc sys lib/modules etc/rc.dboot mnt media opt misc -pv

至此,虚拟磁盘就构建完成了。

3.虚拟化平台节点桥设备构建
两个节点都需要配置;
1).test1节点:

添加网卡桥设备文件:
# cd /etc/sysconfig/network-scripts/
# cp ifcfg-eth0 ifcfg-xenbr0
配置桥接设备:
# vim ifcfg-xenbr0
DEVICE="xenbr0"
BOOTPROTO="static"
NM_CONTROLLED="no"
ONBOOT="yes"
TYPE="Bridge"
IPADDR=172.16.31.1
NETMASK=255.255.0.0
GATEWAY=172.16.0.1
 
配置网卡设备:
# vim ifcfg-eth0
DEVICE="eth0"
BOOTPROTO="static"
HWADDR="08:00:27:16:D9:AA"
NM_CONTROLLED="no"
ONBOOT="yes"
BRIDGE="xenbr0"
TYPE="Ethernet"
USERCTL="no"

2).test2节点的配置:

添加网卡桥设备文件:
# cd /etc/sysconfig/network-scripts/
# cp ifcfg-eth0 ifcfg-xenbr0
配置桥接设备:
# vim ifcfg-xenbr0
DEVICE="xenbr0"
BOOTPROTO="static"
NM_CONTROLLED="no"
ONBOOT="yes"
TYPE="Bridge"
IPADDR=172.16.31.2
NETMASK=255.255.0.0
GATEWAY=172.16.0.1
 
配置网卡设备:
# vim ifcfg-eth0
DEVICE="eth0"
BOOTPROTO="static"
HWADDR="08:00:27:6A:9D:57"
NM_CONTROLLED="no"
ONBOOT="yes"
BRIDGE="xenbr0"
TYPE="Ethernet"
USERCTL="no"

3).配置桥接模式需要将NetworkManager服务关闭:

两个节点都需要操作
#chkconfig NetworkManager off
#service NetworkManager stop
 
配置完成后重启网络服务:
#service network restart

4).登录终端查看桥接状态:

# ifconfig
eth0   Link encap:Ethernet HWaddr08:00:27:16:D9:AA 
     inet6 addr: fe80::a00:27ff:fe16:d9aa/64 Scope:Link
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
     RX packets:37217 errors:0 dropped:7 overruns:0 frame:0
     TX packets:4541 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:1000
     RX bytes:7641467 (7.2 MiB) TXbytes:773075 (754.9 KiB)
 
lo    Link encap:Local Loopback 
     inet addr:127.0.0.1 Mask:255.0.0.0
     inet6 addr: ::1/128 Scope:Host
     UP LOOPBACK RUNNING MTU:65536 Metric:1
     RX packets:12 errors:0 dropped:0 overruns:0 frame:0
     TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:0
     RX bytes:1032 (1.0 KiB) TXbytes:1032 (1.0 KiB)
 
xenbr0  Link encap:Ethernet HWaddr08:00:27:16:D9:AA 
     inet addr:172.16.31.1 Bcast:172.16.255.255 Mask:255.255.0.0
     inet6 addr: fe80::a00:27ff:fe16:d9aa/64 Scope:Link
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
     RX packets:1211 errors:0 dropped:0 overruns:0 frame:0
     TX packets:90 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:0
     RX bytes:116868 (114.1 KiB) TXbytes:15418 (15.0 KiB)

4.构建busybox虚拟机

创建虚拟机配置文件
# vim /etc/xen/busybox
kernel ="/boot/vmlinuz-2.6.32-504.el6.x86_64"
ramdisk ="/boot/initramfs-2.6.32-504.el6.x86_64.img"
name = "busybox"
memory = "512"
vcpus = 1
disk =['file:/scsistore/busybox.img,xvda,w',]
root = "/dev/xvda ro"
extra = "selinux=0 init=/bin/sh"
vif = ['bridge=xenbr0',]
on_crash = "destroy"
on_reboot = "destroy"
on_shutdown = "destroy"

将配置文件复制一份到节点test2上:
# scp /etc/xen/busybox root@172.16.31.2:/etc/xen/

如果希望busybox这个用户空间能够设置网卡,我们还需要加载xen-netfront.ko进入虚拟机磁盘的指定目录;
我们将Dom0中的xen-netfront.ko模块复制进虚拟机磁盘的lib/modules/目录中:

# cd /lib/modules/2.6.32-504.el6.x86_64/kernel/drivers/net/

需要查看模块依赖关系:

# modinfo xen-netfront.ko
filename:    xen-netfront.ko
alias:     xennet
alias:     xen:vif
license:    GPL
description:  Xen virtual network device frontend
srcversion:   5C6FC78BC365D9AF8135201
depends:    
vermagic:    2.6.32-504.el6.x86_64 SMP mod_unloadmodversions

可以发现无依赖关系,我们可以直接使用:
# cp xen-netfront.ko /mnt/lib/modules/

复制完成后卸载虚拟机磁盘:
# umount /mnt

至此,我们的虚拟机busybox就创建完毕!

5.我将卸载scsistore,到另外的Xen虚拟化平台挂载查看测试:
在test1节点卸载:
[root@test1 xen]# umount /scsistore/

在test2节点上发现iSCSI共享存储:

[root@test2 ~]# iscsiadm -m discovery -t st-p 172.16.31.3
Starting iscsid:                     [ OK ]
172.16.31.3:3260,1 iqn.2015-02.com.stu31:t1

注册iscsi共享设备,节点登录,

[root@test2 ~]# iscsiadm -m node -Tiqn.2015-02.com.stu31:t1 -p 172.16.31.3 -l
[root@test2 ~]# fdisk -l /dev/sdb
 
Disk /dev/sdb: 5378 MB, 5378310144 bytes
166 heads, 62 sectors/track, 1020 cylinders
Units = cylinders of 10292 * 512 = 5269504bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x8e1d9dd0
 
 Device Boot   Start     End   Blocks Id System
/dev/sdb1        1     409  2104683  83 Linux

挂载磁盘后查看磁盘中的内容:

[root@test2 ~]# mkdir /scsistore
[root@test2 ~]# mount /dev/sdb1 /scsistore/
[root@test2 ~]# ls /scsistore/
busybox.img lost+found

可以发现文件是共享的,我们的iSCSI共享存储是正常的。

四.两个虚拟化平台的虚拟机实时迁移测试

1.两个虚拟化节点挂载共享存储

test1节点:
[root@test1 ~]# mount /dev/sdb1 /scsistore/
[root@test1 ~]# ls /scsistore/
busybox.img lost+found
test2节点:
[root@test2 ~]# mount /dev/sdb1 /scsistore/
[root@test2 ~]# ls /scsistore/
busybox.img lost+found

2.启动虚拟机busybox
test1节点启动:

[root@test1 ~]# xm create -c busybox
Using config file"/etc/xen/busybox".
Started domain busybox (id=13)
               Initializingcgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 2.6.32-504.el6.x86_64(mockbuild@c6b9.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat4.4.7-11) (GCC) ) #1 SMP Wed Oct 15 04:27:16 UTC 2014
Command line: root=/dev/xvda ro selinux=0init=/bin/sh
#信息略...;加载网卡模块;
/ # insmod /lib/modules/xen-netfront.ko
Initialising Xen virtual ethernet driver.
#设置网卡ip地址;
/ # ifconfig eth0 172.16.31.4 up
/ # ifconfig
eth0   Link encap:Ethernet HWaddr00:16:3E:49:E8:18 
     inet addr:172.16.31.4 Bcast:172.16.255.255 Mask:255.255.0.0
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
     RX packets:42 errors:0 dropped:0 overruns:0 frame:0
     TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:1000
     RX bytes:2942 (2.8 KiB) TXbytes:0 (0.0 B)
     Interrupt:247

test2节点启动:

[root@test2 ~]# xm create -c busybox
Using config file"/etc/xen/busybox".
Started domain busybox (id=2)
               Initializingcgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 2.6.32-504.el6.x86_64(mockbuild@c6b9.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat4.4.7-11) (GCC) ) #1 SMP Wed Oct 15 04:27:16 UTC 2014
Command line: root=/dev/xvda ro selinux=0init=/bin/sh
#信息略...
EXT4-fs (xvda): mounted filesystem withordered data mode. Opts:
dracut: Mounted root filesystem /dev/xvda
dracut: Switching root
/bin/sh: can't access tty; job controlturned off
/ # ifconfig
/ # insmod /lib/modules/xen-netfront.ko
Initialising Xen virtual ethernet driver.
/ # ifconfig eth0 172.16.31.5 up
/ # ifconfig
eth0   Link encap:Ethernet HWaddr00:16:3E:41:B0:32 
     inet addr:172.16.31.5 Bcast:172.16.255.255 Mask:255.255.0.0
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
     RX packets:57 errors:0 dropped:0 overruns:0 frame:0
     TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:1000
     RX bytes:3412 (3.3 KiB) TXbytes:0 (0.0 B)
     Interrupt:247

技巧:按CTRL+]退出虚拟机
这里我只是为了测试两个虚拟化平台都能运行虚拟机,所以都建立了busybox这个虚拟机,但是我们迁移的时候只需要一台busybox,我们在test1节点上将busybox迁移到test2节点。
我们先将所有的虚拟机都关闭:

#xm destory busybox

3.配置节点实时迁移
test节点的配置:

[root@test1 ~]# grep xend/etc/xen/xend-config.sxp |grep -v "#"     
(xend-http-server yes)
(xend-unix-server yes)
(xend-relocation-server yes)
(xend-relocation-port 8002)
(xend-relocation-address '172.16.31.1')
(xend-relocation-hosts-allow '')

test2节点的配置:

[root@test2 ~]# grep xend/etc/xen/xend-config.sxp |grep -v '#'
(xend-http-server yes)
(xend-unix-server yes)
(xend-relocation-server yes)
(xend-relocation-port 8002)
(xend-relocation-address '172.16.31.2')
(xend-relocation-hosts-allow '')

两个虚拟化节点重启xend服务:

# service xend restart
Stopping xend daemon:                   [ OK ]
Starting xend daemon:                   [ OK ]

查看监听端口:

# ss -tunl |grep 8002
tcp  LISTEN   0   5      172.16.31.2:8002         *:*

启动节点test1的busybox:

#xm create -c busybox
#信息略...
#设置IP地址,以便一会儿迁移后查看有依据;
/ # insmod /lib/modules/xen-netfront.ko
Initialising Xen virtual ethernet driver.
/ # ifconfig eth0 172.16.31.4 up
/ # ifconfig
eth0   Link encap:Ethernet HWaddr00:16:3E:28:BB:F6 
     inet addr:172.16.31.4 Bcast:172.16.255.255 Mask:255.255.0.0
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
     RX packets:921 errors:0 dropped:0 overruns:0 frame:0
     TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:1000
     RX bytes:78367 (76.5 KiB) TXbytes:84 (84.0 B)
     Interrupt:247

将test1节点的虚拟机迁移到test2节点:
[root@test1 ~]# xm migrate -l busybox 172.16.31.2
迁移完成后查看test1节点的虚拟机列表:

[root@test1 ~]# xm list
Name                    ID  Mem VCPUs   State Time(s)
Domain-0                   0 1023  1   r-----  710.1

迁移完成后查看test2节点的虚拟机:

[root@test2 network-scripts]# xm list
Name                    ID  Mem VCPUs   State Time(s)
Domain-0                   0 1023  1   r-----  142.8
[root@test2 network-scripts]# xm list
Name                    ID  Mem VCPUs   State Time(s)
Domain-0                   0 1023  1   r-----  147.4
busybox                   3  512  0   --p---   0.0

连接上test2的虚拟机查看:

[root@test2 ~]# xm console busybox
Using NULL legacy PIC
Changing capacity of (202, 0) to 2097152sectors
Changing capacity of (202, 0) to 2097152sectors
 
/ # ifconfig
eth0   Link encap:Ethernet HWaddr00:16:3E:1D:38:69 
     inet addr:172.16.31.4 Bcast:172.16.255.255 Mask:255.255.0.0
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
     RX packets:350 errors:0 dropped:0 overruns:0 frame:0
     TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:1000
     RX bytes:27966 (27.3 KiB) TXbytes:84 (84.0 B)
     Interrupt:247

可以发现迁移到test2节点上的虚拟机的地址是test1上的;证明我们的迁移完成了。
至此,我们的Xen虚拟化平台的实时迁移实验就完成了。