KVM虚拟机克隆

1.完整克隆

• 创建完整克隆

#注意：只有关机状态才能克隆
[root@kvm-server-01 ~]# virt-clone --auto-clone -o centos7.6 -n centos7.6-v1
Allocating 'centos7.6-v1.qcow2'                                          |  10 GB  00:00:50     

Clone 'centos7.6-v1' created successfully.

[root@kvm-server-01 ~]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     centos7.6                      shut off
 -     centos7.6-v1                   shut off

#查看克隆主机的镜像文件
[root@kvm-server-01 ~]# ll /opt/centos7.6-v1.qcow2
-rw------- 1 root root 1511194624 Jul 30 21:34 /opt/centos7.6-v1.qcow2

#查看克隆主机的配置文件
[root@kvm-server-01 ~]# ll /etc/libvirt/qemu/centos7.6-v1.xml 
-rw------- 1 root root 4579 Jul 30 21:33 /etc/libvirt/qemu/centos7.6-v1.xml

2.创建链接克隆

• 链接克隆的创建

#创建一个基于宿主机的磁盘 
[root@kvm-server-01 opt]# qemu-img create -f qcow2 -b centos7.6.qcow2 centos7.6-2.qcow2
[root@kvm-server-01 opt]# ll -h centos7.6-2.qcow2 
-rw-r--r-- 1 root root 193K Jul 30 22:41 centos7.6-2.qcow2

#导出宿主机的配置信息 
[root@kvm-server-01 opt]# virsh dumpxml centos7.6 > centos7.6-2.xml

#修改centos7.6-2.xml配置
[root@kvm-server-01 opt]# vim centos7.6-2.xml
1.删除uuid和mac地址信息
2.修改centos7.6为centos7.6-2
  <name>centos7.6-2</name>
      <source file='/opt/centos7.6-2.qcow2'/>

#导入配置
[root@kvm-server-01 opt]# virsh define centos7.6-2.xml 
Domain centos7.6-2 defined from centos7.6-2.xml
[root@kvm-server-01 opt]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 31    centos7.6-link-v1              running
 -     centos7.6                      shut off
 -     centos7.6-2                    shut off

#启动链接克隆
[root@kvm-server-01 opt]# virsh start centos7.6-2
[root@kvm-server-01 opt]# virsh list
 Id    Name                           State
----------------------------------------------------
 31    centos7.6-link-v1              running
 32    centos7.6-2                    running

• 编写脚本实现一键创建链接克隆

[root@kvm-server-01 opt]# cat link-clone.sh 
#!/bin/bash
Old_Name=$1
New_Name=$2

#判断函数
judgment_fun(){
    if [ $? -eq 0 ];then
        echo -e "\033[32m${1}\033[0m"
    else
        echo -e "\033[31m${2}\033[0m"
        exit
    fi
}

#关闭宿主机
virsh list | grep "${Old_Name}[ ]*running"
if [ $? -eq 0 ];then
    echo -e "\033[31m虚拟主机${Old_Name}正在运行，请关闭后再进行链接克隆！\033[0m"
    exit
fi

#创建基于宿主机的硬盘
qemu-img create -f qcow2 -b ${Old_Name}.qcow2 ${New_Name}.qcow2 &>/dev/null
judgment_fun 链接克隆${New_Name}硬盘创建成功！ 链接克隆${New_Name}硬盘创建失败！

#导出宿主机配置
virsh dumpxml $Old_Name > ${New_Name}.xml
judgment_fun 宿主机${Old_Name}配置导出成功！ 宿主机${Old_Name}配置导出失败！

#修改导出配置的文件
sed -i "s@$Old_Name@$New_Name@g" ${New_Name}.xml
sed -ri '/uuid|mac address/d' ${New_Name}.xml

#导入配置，生成链接克隆
virsh define ${New_Name}.xml
judgment_fun 链接克隆${New_Name}创建成功！ 链接克隆${New_Name}创建失败！

#启动链接克隆
virsh start ${New_Name}
judgment_fun 虚拟主机${New_Name}启动成功！ 虚拟主机${New_Name}启动失败！

# 清除无效文件
rm -rf ${New_Name}.xml

• 执行脚本创建链接克隆

[root@kvm-server-01 opt]# sh link-clone.sh centos7.6 centos7.6-link-v1
链接克隆centos7.6-link-v1硬盘创建成功！
宿主机centos7.6配置导出成功！
Domain centos7.6-link-v1 defined from centos7.6-link-v1.xml

链接克隆centos7.6-link-v1创建成功！
Domain centos7.6-link-v1 started

虚拟主机centos7.6-link-v1启动成功！

[root@kvm-server-01 opt]# virsh list 
 Id    Name                           State
----------------------------------------------------
 31    centos7.6-link-v1              running