动态迁移一台基于NFS共享存储的PV虚拟机——By Kevein Liu

 1 在NFS的服务器配置
网络环境 192.168.0.128/24

[root@localhost ~]# mkdir /virtual;cd /virtual/

[root@localhost virtual]#dd if=/dev/zero of=./storage.img bs=1M count=8192

[root@localhost virtual]# chmod 666 storage.img

[root@localhost virtual]# vi /etc/exports /virtual 192.168.0.0/24(rw)

[root@localhost virtual]# service portmap restart

Stopping portmap:                                          [  OK  ]
Starting portmap:                                          [  OK  ]

[root@localhost virtual]# service nfs restart

Shutting down NFS mountd:                                  [  OK  ]
Shutting down NFS daemon:                                  [  OK  ]
Shutting down NFS quotas:                                  [  OK  ]
Shutting down NFS services:                                [  OK  ]
Starting NFS services:                                     [  OK  ]
Starting NFS quotas:                                       [  OK  ]
Starting NFS daemon:                                       [  OK  ]
Starting NFS mountd:                                       [  OK  ]

 

[root@localhost virtual]# exportfs

/virtual 192.168.0.0/24

 

2 客户端一
网络环境 192.168.0.136/24

在此机器上建立一个PV，将该PV迁移到客户端二上
(1)将NFS服务器上的目录挂载到本地

 

# mount 192.168.0.128:/virtual/ /virtual/


(2)建立PV

 

#virt-install -p -n forMig -f /virtual/storage.img -r 256 -l -w bridge:xenbr0

 

(3)修改#vi /etc/xen/xend-config.sxp
 (xend-relocation-server yes)
/* A boolean value that tells xend whether or not to start the relocation server.  This is required for cross-machine migrations.Defaults to no.*/

 

 (xend-relocation-address '')
/* The address to which the relocation server will bind.  Defaults to  which means "all interfaces".*/

 

 (xend-relocation-hosts-allow '')

 

3 客户端二
网络环境 192.168.0.191/24

(1)将NFS服务器上的目录挂载到本地

 

# mount 192.168.0.128:/virtual/ /virtual/


(2)修改#vi /etc/xen/xend-config.sxp
 (xend-relocation-server yes)

 (xend-relocation-address '')

 (xend-relocation-hosts-allow '')

4 测试

 

#xm migrate --live 12 192.168.0.191

12是forMig的domain-id
运行这条命令后，在客户端二中打开virt-manager。发现已经出现了forMig这个PV，其domain-id为22。实验成功。

 

    在实现泛虚拟化(Para-virtualizition)的Live迁移时，一定要保证三点：

       1。Same share storage;Domain's VBDs must be visible to all.

       2。Same network ;the same link and sub net

       3。Same CPU's architecture ;

 做实验的时候可以开启某个服务，如Apache。同时测试服务是否中断。