KVM虚拟机迁移
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目录
新建一台KVM虚拟机
wget http://download.cirros-cloud.net/0.3.4/cirros-0.3.4-i386-disk.img
virt-install -n "mx01" -r 512 --vcpus=2 --disk path=/var/lib/libvirt/images/cirros-0.3.4-i386-disk.img --import
KVM虚拟机静态迁移
确定虚拟机关闭状态
[root@kvm-max ~]# virsh list --all Id Name State ---------------------------------------------------- - demo3 shut off [root@victory ~]# virsh shutdown demo Domain demo is being shutdown
迁移主机
准备迁移demo3虚拟机，查看该虚拟机配置的磁盘文件
[root@victory images]# virsh domblklist demo3 Target Source ------------------------------------------------ hda /var/lib/libvirt/images/cirros-0.3.3-x86_64-disk.img
导入虚拟机配置文件
[root@victory ~]# virsh dumpxml demo3 > /opt/demo3.xml [root@victory ~]# ll /opt/ total 8 -rw-r--r-- 1 root root 2786 Feb 26 03:39 demo3.xml
复制配置文件到目标虚拟主机上
[root@victory ~]# scp /opt/demo3.xml 10.0.0.49:/etc/libvirt/qemu/ The authenticity of host '10.0.0.49 (10.0.0.49)' can't be established. RSA key fingerprint is f2:88:1c:ec:52:c8:0a:aa:b8:f8:3a:76:2e:b9:6f:4f. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '10.0.0.49' (RSA) to the list of known hosts. root@10.0.0.49's password: demo3.xml 100% 2786 2.7KB/s 00:00
查看虚拟机磁盘文件并拷贝到目标虚拟主机
[root@victory ~]# cd /var/lib/libvirt/images/ [root@victory images]# ll total 10598988 -rw-r--r-- 1 root root 14221312 Feb 26 04:40 cirros-0.3.3-x86_64-disk.img
拷贝虚拟磁盘文件:
[root@victory images]# scp cirros-0.3.3-x86_64-disk.img 10.0.0.49:/var/lib/libvirt/images/ root@10.0.0.49's password: cirros-0.3.3-x86_64-disk.img 100% 14MB 6.8MB/s 00:02
目标虚拟主机配置
查看目标虚拟主机环境
[root@maxin ~]# virsh list --all Id Name State ---------------------------------------------------- [root@maxin ~]# ll /etc/libvirt/qemu total 12 -rw-r--r-- 1 root root 2786 Mar 11 21:18 demo3.xml drwx------ 3 root root 4096 Mar 4 15:02 networks
查看虚拟机磁盘文件，目录结构与源虚拟主机一致。
[root@maxin ~]# cd /var/lib/libvirt/images/ [root@maxin images]# ll total 10599128 -rw-r--r-- 1 root root 14221312 Mar 11 22:07 cirros-0.3.3-x86_64-disk.img
定义注册虚拟主机
[root@maxin images]# virsh define /etc/libvirt/qemu/demo3.xml Domain demo3 defined from /etc/libvirt/qemu/demo3.xml
启动虚拟主机并确认
[root@maxin images]# virsh list --all Id Name State ---------------------------------------------------- 2 demo running - demo3 shut off [root@maxin images]# virsh start demo3 Domain demo3 started
[root@maxin images]# virsh console demo3
Connected to domain demo3
Escape character is ^]
login as 'cirros' user. default password: 'cubswin:)'. use 'sudo' for root.
cirros login: cirros
Password:
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 52:54:00:4d:52:e9 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.172/24 brd 192.168.122.255 scope global eth0
inet6 fe80::5054:ff:fe4d:52e9/64 scope link
valid_lft forever preferred_lft forever
开启Console功能
新安装一台虚拟机后，是无法通过virsh console 命令连入虚拟机中的，这时需要开启虚拟机的console功能。添加ttyS0的许可，允许root登陆
[root@ kvm-2 ~]# echo "ttyS0" >> /etc/securetty
