KVM：Kernel-based Virtual Machine（基于内核的虚拟机）。

（1）确认是否能够安装KVM

# grep -E 'svm|vmx' /proc/cpuinfo > /dev/null && echo OK
# grep flags /proc/cpuinfo|grep lm > /dev/null && echo OK

（2）安装KVM

# yum -y install libguestfs libvirt libvirt-client python-virtinst qemu-kvm qemu-img virt-manager virt-top virt-viewer virt-who virt-install bridge-utils
# systemctl start libvirtd
# systemctl enable libvirtd

（3）配置网络Bridged Network

# systemctl disable NetworkManager
# systemctl stop  NetworkManager
# vi /etc/sysconfig/network-scripts/ifcfg-br0
DEVICE=br0
BOOTRPOTO=none
TYPE=Bridge
ONBOOT=yes
DEFROUTE=yes
IPV6INIT=no
NM_CONTROLLED=yes
USERCTL=no
IPADDR=192.168.21.176
NETMASK=255.255.255.0
GATEWAY=192.168.21.254
DNS1=219.149.6.99
# vi /etc/sysconfig/network-scripts/ifcfg-p4p1
TYPE=Ethernet
BOOTPROTO=static
IPV6INIT=no
NAME=p4p1
UUID=4497ef0a-b570-49fc-bd41-cca65af5934d
DEVICE=p4p1
ONBOOT=yes
IPADDR=192.168.21.176
PREFIX=24
GATEWAY=192.168.21.254
DNS1=219.149.6.99
BRIDGE=br0
# systemctl restart network
# ifconfig
# brctl show

（4）安装虚拟机

# qemu-img create -f qcow2 /var/lib/libvirt/images/kvm01_centos7.img 20G
# ls -l /var/lib/libvirt/images
# virt-install \
--name=kvm01_centos7 \
--hvm \
--virt-type kvm \
--vcpus=2 --ram=1024 \
--network bridge=br0 \
--disk path=/var/lib/libvirt/images/kvm01_centos7.img,size=20 \
--location=/tmp/CentOS-7-x86_64-Minimal-1511.iso \
--os-type=linux --os-variant=rhel7 \
--accelerate \
--nographics \
--autostart \
--extra-args "console=ttyS0"

配置kvm的IP

# virsh start kvm01_centos7
# virsh console kvm01_centos7
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
# shutdown -r now

（5）虚拟机操作

KVM的配置文件

# ll /etc/libvirt/qemu/

查看已安装的kvm

# virsh list --all

启动停止重启kvm

# virsh start kvm01_centos7
# virsh shutdown kvm01_centos7
# virsh reboot kvm01_centos7

配置kvm

# virsh dumpxml kvm01_centos7
# virsh edit kvm01_centos7

链接kvm

# virsh console kvm01_centos7

退出kvm


查看kvm

# virsh dominfo kvm01_centos7
# virt-top

快照kvm

# virsh snapshot-list kvm01_centos7
# virsh snapshot-create-as kvm01_centos7 kvm01_centos7-snapshot-2016-09-06-001
# virsh snapshot-revert kvm01_centos7 kvm01_centos7-snapshot-2016-09-06-001
# virsh snapshot-delete kvm01_centos7 kvm01_centos7-snapshot-2016-09-06-001

复制kvm

# virsh shutdown kvm01_centos7
# virt-clone -o kvm01_centos7 -n kvm02_centos7 -f /var/lib/libvirt/images/kvm02_centos7.img
# ll /var/lib/libvirt/images/
# virsh list --all

# virsh start kvm02_centos7
# virsh console kvm02_centos7
# vi /etc/hosts
# vi /etc/hostname (CentOS6是/etc/sysconfig/network)
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
# vi /etc/udev/rules.d/70-persistent-net.rules
# shutdown -r now

删除kvm

# virsh autostart --disable kvm01_centos7
# virsh destroy kvm01_centos7
# virsh undefine kvm01_centos7