openstack虛擬機器動態遷移有兩個方式，塊遷移和共享儲存遷移。
前提條件:
目標物理伺服器是有足夠的記憶體，虛擬CPU，磁碟。cpu同類型
說明：
本文用nfs用作共享儲存演示，共有四個節點controller、 computer1、computer2、block。其中block是cinder塊儲存同時用作nfs伺服器。虛擬機器從computer1動態遷移到computer2上

controller : 192.168.5.161
computer1 : 192.168.5.162
computer2: 192.168.5.163
block:192.168.5.164
 

一、配置nfs伺服器
1、安裝nfs軟體

# yum install nfs* -y

2、建立共享目錄，並賦予許可權，其中id162為nova使用者ID

# mkdir /data
# chown 162:162 /data
# chmod 777 data/
# echo '/data  192.168.5.0/24(rw,sync,all_squash,anonuid=162,anongid=162)' >/etc/exports

3、啟動nfs服務，注意nfs在centos7中需要先啟動rpcbind才能啟動nfs

# service rpcbind start
# service nfs-server start
 

# chkconfig  rpcbind on
# chkconfig nfs-server  on

二、各個計算節點配置
1、配置nfs

# mkdir /nova_data 
# yum install nfs* -y
# mount -t nfs 192.168.5.164:/data /nova_data

2、配置啟動檔案，_netdev引數為nfs沒啟動情況下系統可正常啟動。

# echo '192.168.5.164:/data  /nova_data  nfs  _netdev,defaults,user,auto,noatime,intr   0 0' >>/etc/fstab
 

3、配置nova.conf

instances_path=/nova_data
live_migration_flag=VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER, VIR_MIGRATE_LIVE, VIR_MIGRATE_TUNNELLED,VIR_MIGRATE_UNSAFE
[vnc]
vncserver_listen = 0.0.0.0
vncserver_proxyclient_address = 192.168.8.71
novncproxy_base_url = http://192.168.8.71:6080/vnc_auto.html
enabled = True

4、配置/etc/libvirt/qemu.conf

vnc_listen = "0.0.0.0"
user = "root"
group = "root"
dynamic_ownership = 1

5、配置/etc/libvirt/libvirtd.conf

listen_tls = 0
listen_tcp = 1
auth_tcp="none"
listen_addr = "0.0.0.0" 
tcp_port = "16509"

6、配置/etc/sysconfig/libvirtd

LIBVIRTD_CONFIG=/etc/libvirt/libvirtd.conf
LIBVIRTD_ARGS="--listen"

7、重啟服務

#重啟服務
# service libvirtd restart
# service openstack-nova-compute restart

8、測試

virsh -c qemu+tcp://伺服器IP/system  #請在伺服器IP處填寫你的各個計算節點IP或主機名
[[email protected] /]# virsh -c qemu+tcp://wuyeliang/system
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

四、動態遷移
1、建立虛擬機器（通過cinder建立虛擬機器和本地共享儲存兩種）
略過
2、檢視例項

# source admin-openrc.sh 
# nova list --all-te 
+--------------------------------------+--------+----------------------------------+--------+------------+-------------+----------------------+
| ID                                   | Name   | Tenant ID                        | Status | Task State | Power State | Networks             |
+--------------------------------------+--------+----------------------------------+--------+------------+-------------+----------------------+
| f3d749ba-98e1-4624-9782-6da729ad164c | demo-1 | 6aa0d6b0992042d8b116eeb40dd570d0 | ACTIVE | -          | Running     | public=216.168.10.15 |
| 8da00f69-05f6-4425-9a8a-df56b79a474f | demo-2 | 6aa0d6b0992042d8b116eeb40dd570d0 | ACTIVE | -          | Running     | public=216.168.10.14 |
+--------------------------------------+--------+----------------------------------+--------+------------+-------------+----------------------+

3、檢視需要遷移虛擬機器例項

# nova show f3d749ba-98e1-4624-9782-6da729ad164c

4、檢視可用的計算節點

[[email protected] ~]# nova-manage service list 
No handlers could be found for logger "oslo_config.cfg"
Binary           Host                                 Zone             Status     State Updated_At
nova-cert        wuyeliang                            internal         enabled    :-)   2016-03-08 00:55:09
nova-scheduler   wuyeliang                            internal         enabled    :-)   2016-03-08 00:55:10
nova-consoleauth wuyeliang                            internal         enabled    :-)   2016-03-08 00:55:09
nova-conductor   wuyeliang                            internal         enabled    :-)   2016-03-08 00:55:09
nova-compute     wuyeliang                            nova             enabled    :-)   2016-03-08 00:55:01
nova-compute     computer1                            nova             enabled    :-)   2016-03-08 00:55:08
nova-compute     computer2                            nova             enabled    :-)   2016-03-08 00:55:08

5、檢視目標節點資源

[[email protected] ~]#  nova-manage service describe_resource  computer1
HOST                              PROJECT     cpu mem(mb)     hdd
computer1       (total)                         2    1840      17
computer1       (used_now)                      1    1024       1
computer1       (used_max)                      1     512       1
computer1                6aa0d6b0992042d8b116eeb40dd570d0       1     512       1

6、開始遷移，正常無任何回顯

#nova live-migration 8da00f69-05f6-4425-9a8a-df56b79a474f computer1