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轉載自：http://www.cnblogs.com/kevingrace/p/6018676.html 散盡浮華
openstack虛拟機遷移的操作記錄
需求說明:
計算節點linux-node1.openstack：192.168.1.8
計算節點linux-node2.openstack：192.168.1.17
這兩個計算節點在同一個控制節點下（192.168.1.8既是控制節點，也是其中一個計算節點），現在需要将linux-node1.openstack上的虛拟機kvm-server005遷移到liunx-node2.openstack上。
一、openstack的虛拟機線下遷移（”冷遷移“，遷移前關閉虛拟機）
操作記錄如下：
linux-node1.openstack上的操作：
1）檢視虛拟機
[[email protected] src]# source admin-openrc.sh
[[email protected] src]# nova list
2）停止待遷移虛拟機kvm-server005
[[email protected] src]# nova stop 3483d9f1-4015-48d9-9837-b67ca82dd54d
Request to stop server 3483d9f1-4015-48d9-9837-b67ca82dd54d has been accepted.
[[email protected] src]# nova list
3）檢視待遷虛拟機kvm-server005所在的主控端
[[email protected] src]# nova show 3483d9f1-4015-48d9-9837-b67ca82dd54d | grep 'OS-EXT-SRV-ATTR:hos'
| OS-EXT-SRV-ATTR:host | linux-node1.openstack
4）登入主控端linux-node1.openstack上,将虛拟機kvm-server005虛拟機的資料拷貝到待遷移的主控端linux-node2.openstack上
[[email protected] src]# cd /var/lib/nova/instances
[[email protected] instances]# ls
30e5ba3e-3942-4119-9ba6-7523cf865b6f 5ec50ae5-a1f9-4425-b509-cfeb5ef62ca3 a5863e46-ef75-4601-a9df-505da5db58ed compute_nodes
3483d9f1-4015-48d9-9837-b67ca82dd54d 9acdb28b-02c2-41bb-87c4-5f3a8fa008ab b6a4738d-7e01-4068-a09b-7008b612d126 locks
377c536e-4d27-4447-8d9d-24c2686a73f6 a2893208-3ec9-4606-ab82-d7a870206cb9 _base snapshots
[[email protected] instances]# rsync -e "ssh -p22" -avpgolr 3483d9f1-4015-48d9-9837-b67ca82dd54d 192.168.1.17:/var/lib/nova/instances/
sending incremental file list
3483d9f1-4015-48d9-9837-b67ca82dd54d/
3483d9f1-4015-48d9-9837-b67ca82dd54d/console.log
3483d9f1-4015-48d9-9837-b67ca82dd54d/disk
3483d9f1-4015-48d9-9837-b67ca82dd54d/disk.info
3483d9f1-4015-48d9-9837-b67ca82dd54d/disk.swap
3483d9f1-4015-48d9-9837-b67ca82dd54d/libvirt.xml
sent 381469737 bytes received 111 bytes 69358154.18 bytes/sec
total size is 381422781 speedup is 1.00
目标節點linux-node2.openstack上的操作
1）檢視虛拟機kvm-server005的資料有沒有拷貝過來，修改權限
[[email protected] instances]# pwd
/var/lib/nova/instances
[[email protected] instances]# ll
total 12
drwxr-xr-x. 2 nova nova 85 Oct 31 14:54 0944254c-1c75-4523-9751-2389d677d59c
drwxr-xr-x. 2 nova nova 85 Sep 6 12:59 3483d9f1-4015-48d9-9837-b67ca82dd54d
drwxr-xr-x. 2 nova nova 85 Oct 31 17:29 946b340a-28bc-492d-8b3a-59d2fea1b464
drwxr-xr-x. 2 nova nova 4096 Oct 31 17:17 _base
-rw-r--r--. 1 nova nova 44 Nov 1 10:53 compute_nodes
drwxr-xr-x. 2 nova nova 85 Oct 31 17:23 f6be1cb3-a694-4492-b2db-55ff9f09d843
drwxr-xr-x. 2 nova nova 4096 Oct 31 17:14 locks
[[email protected] instances]# chown -R nova.nova 3483d9f1-4015-48d9-9837-b67ca82dd54d/
[[email protected] instances]# ll 3483d9f1-4015-48d9-9837-b67ca82dd54d/
total 372492
-rw-rw----. 1 nova nova 65214 Sep 8 13:58 console.log
-rw-r--r--. 1 nova nova 381157376 Nov 1 10:59 disk
-rw-r--r--. 1 nova nova 162 Sep 6 12:59 disk.info
-rw-r--r--. 1 nova nova 197120 Sep 6 12:59 disk.swap
-rw-r--r--. 1 nova nova 2909 Sep 6 12:59 libvirt.xml
2）登入資料庫更改MySQL中的host、node字段為新的實體主機名字
[[email protected] instances]# mysql -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 4063
Server version: 10.1.17-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> use nova;
Database changed
MariaDB [nova]> update instances set host='linux-node2.openstack', node='linux-node2.openstack' where uuid='3483d9f1-4015-48d9-9837-b67ca82dd54d';
Query OK, 1 rows affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
MariaDB [nova]>
3）在目标節點linux-node2.openstack上啟動虛拟機，啟動前重新開機一下該計算節點的compute服務
[[email protected] instances]# systemctl restart openstack-nova-compute
[[email protected] instances]# nova start 3483d9f1-4015-48d9-9837-b67ca82dd54d
4）驗證虛拟機所在的主控端
[[email protected] src]# nova list
[[email protected] src]# nova show 3483d9f1-4015-48d9-9837-b67ca82dd54d | grep 'OS-EXT-SRV-ATTR:hos'
| OS-EXT-SRV-ATTR:host | linux-node2.openstack
二、openstack的虛拟機線上遷移（”熱遷移“，虛拟機在運作中遷移）
直接在控制節點上操作
1）檢視虛拟機
[[email protected] src]# source admin-openrc.sh
[[email protected] src]# nova list
2）檢視待遷虛拟機kvm-server005所在的主控端
[[email protected] src]# nova show 3483d9f1-4015-48d9-9837-b67ca82dd54d | grep 'OS-EXT-SRV-ATTR:hos'
| OS-EXT-SRV-ATTR:host | linux-node1.openstack
3）檢視可用的計算節點
[[email protected] src]# nova-manage service list
No handlers could be found for logger "oslo_config.cfg"
Binary Host Zone Status State Updated_At
.........
nova-compute linux-node1.openstack nova enabled :-) 2016-11-01 05:12:56
nova-compute linux-node2.openstack nova enabled XXX 2016-10-31 05:55:24
4）檢視目标計算節點linux-node2.openstack資源
[[email protected] src]# nova-manage service describe_resource linux-node2.openstack
No handlers could be found for logger "oslo_config.cfg"
HOST PROJECT cpu mem(mb) hdd
linux-node2.openstack(total) 32 64211 149
linux-node2.openstack(used_now) 6 14848 75
linux-node2.openstack(used_max) 6 14336 75
linux-node2.openstack 0cd3632df93d48d6b2c24c67f70e56b8 6 14336 75
5）執行虛拟機的線上遷移，遷移到計算節點linux-node2.openstack上
[[email protected] src]# nova live-migration 3483d9f1-4015-48d9-9837-b67ca82dd54d linux-node2.openstack
6）檢視遷移後虛拟機kvm-server005所在的主控端是否已發生改變
[[email protected] src]# nova show 3483d9f1-4015-48d9-9837-b67ca82dd54d | grep 'OS-EXT-SRV-ATTR:hos'
| OS-EXT-SRV-ATTR:host | linux-node2.openstack
注意：
1）/etc/hosts檔案提前做好主機映射，确定節點之間能互相ping通主機名。
2）利用id nova指令檢視下控制節點nova的uid和gid，并記錄，保證兩個計算節點的id和gid是否和控制節點保持一緻
如果不一緻，則利用
usermod -u “控制節點的nova的uid”
gropumod -g “控制節點的nova的gid”
兩條指令進行修改,同時在所有計算節點運作該指令，保證所有nova相關檔案使用新的uid和gid