[root@kvm ~]# cat /etc/redhat-release

CentOS Linux release 7.2. (Core)

[root@kvm ~]# uname -r

3.10.-.el7.x86_64

[root@kvm ~]# getenforce

Disabled

[root@kvm ~]# systemctl status firewalld.service

● firewalld.service - firewalld - dynamic firewall daemon

   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)

   Active: inactive (dead)

mkdir -p /application/tools

cd /application/tools

dd if=/dev/sr0 of=/application/tools/CentOS7_2.iso

du -sh /application/tools/CentOS7_2.iso

.1G    /application/tools/CentOS7_2.iso

yum -y install qemu-kvm qemu-kvm-tools virt-manager libvirt virt-install

生成kvm虚拟机：virt-install

查看在运行的虚拟机：virsh list

查看所有虚拟机：virsh list --all

查看kvm虚拟机配置文件：virsh dumpxml name

启动kvm虚拟机：virsh start name

正常关机：virsh shutdown name

非正常关机（相当于物理机直接拔掉电源）：virsh destroy name

删除：virsh undefine name（彻底删除，找不回来了，如果想找回来，需要备份/etc/libvirt/qemu的xml文件）

根据配置文件定义虚拟机：virsh define file-name.xml

挂起，终止：virsh suspend name

恢复挂起状态:virsh resume name

systemctl start libvirtd.service

mkdir -p /application/kvm_data

cd /application/kvm_data

qemu-img create -f qcow2 /application/kvm_data/moban.qcow2 20G

#查看虚拟磁盘详细信息

[root@kvm kvm_data]# qemu-img info moban.qcow2

image: moban.qcow2

file format: qcow2

virtual size: 20G ( bytes)

disk size: 196K

cluster_size:

Format specific information:

    compat: 1.1

    lazy refcounts: false

virt-install --virt-type=kvm --name=c72-moban --vcpus= -r  -c /application/tools/CentOS7_2.iso --network network=default --graphics vnc,listen=0.0.0.0 --noautoconsole --os-type=linux --os-variant=rhel7 --disk path=/application/kvm_data/moban.qcow2,size=,format=qcow2

、磁盘文件

cd /application/kvm_data/

cp moban.qcow2 clone.qcow2

、配置文件

virsh dumpxml c72-moban > test.xml

virsh dumpxml c72-moban > test1.xml

主机名、uuid、配置文件名称、mac地址

[root@moban qemu]# diff test.xml test1.xml

,3c2,

<   <name>c72-clone</name>

<   <uuid>e3f40d09--4b15-93c6-63g56e8aa428</uuid>

---

>   <name>c72-moban</name>

>   <uuid>e3f40d09--4b15-93c6-62d56e8aa428</uuid>

34c34

<       <source file='/application/kvm_data/clone.qcow2'/>

---

>       <source file='/application/kvm_data/moban.qcow2'/>

67c67

<       <mac address='52:54:00:dd:a9:21'/>

---

>       <mac address='52:54:00:dd:a9:f7'/>

virsh define test.xml

virsh start c72-clone

virsh snapshot-create-as c72-clone kuaizhao#创建快照

virsh snapshot-list c72-clone#查看创建的快照

virsh snapshot-info c72-clone kuaizhao1 #还原快照

virsh snapshot-delete c72-clone kuaizhao1#删除快照

#方法一：virsh iface-bridge eth0 br0，虚拟机必须关闭才可以执行上面命令

#方法二：修改配置文件

virsh edit c72-clone，新创建主机采用桥接网卡将--network network=default换成--network bridge=br0。对已经创建的主机，修改成桥接方式。修改配置文件

#方法三：给虚拟机再次添加一块新的网卡，虚拟机需要运行状态

virsh attach-interface c72-moban --type bridge --source br0

brctl addif br0 eth0 && ip addr del dev eth0 10.0.0.201/ && ifconfig br0 10.0.0.201/ up && route add default gw 10.0.0.254