| 1）检查cpu是否支持虚拟化
[root@kevin ~]# grep vmx /proc/cpuinfo
如果有vmx信息输出，就说明支持VT;如果没有任何的输出，说明你的cpu不支持，将无法使用KVM虚拟机。
2）确保BIOS里开启虚拟化功能，即查看是否加载KVM模块
[root@kevin ~]# lsmod | grep kvm
kvm_intel 170086 0
kvm 566340 1 kvm_intel
irqbypass 13503 1 kvm
=========================================================
如果没有加载，运行以下命令：
[root@kevin ~]# modprobe kvm
[root@kevin ~]# modprobe kvm-intel
[root@kevin ~]# lsmod | grep kvm
kvm_intel 170086 0
kvm 566340 1 kvm_intel
irqbypass 13503 1 kvm
=========================================================
内核模块导出了一个名为/dev/kvm的设备，这个设备将虚拟机的的地址空间独立于内核或者任何应用程序的地址空间。
[root@kevin ~]# ll /dev/kvm
crw-rw-rw-. 1 root kvm 10, 232 1月 29 11:56 /dev/kvm
3）桥接网络
如果没有brctl命令（用来管理网桥的工具），则需要安装bridge-utils ，
[root@kevin ~]# yum -y install bridge-utils
[root@kevin ~]# systemctl restart network
配置KVM的网桥模式
[root@kevin ~]# cd /etc/sysconfig/network-scripts/
[root@openstack network-scripts]# cp ifcfg-eno1 ifcfg-br0
[root@openstack network-scripts]# cat ifcfg-br0
TYPE="Bridge" //这一行修改为Bridge
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="no"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="br0" //修改设备名称为br0
#UUID="fdbad04f-dae3-440e-8a8b-01d6a7bc9fe0" //这一行注释
DEVICE="br0" //修改设备为br0
ONBOOT="yes"
IPADDR="192.168.10.210"
PREFIX="24"
GATEWAY="192.168.10.1"
DNS1="8.8.8.8"
[root@openstack network-scripts]# cat ifcfg-eno1
TYPE="Ethernet"
BRIDGE=br0 //添加这一行
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="no"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="eno1"
UUID="fdbad04f-dae3-440e-8a8b-01d6a7bc9fe0"
DEVICE="eno1"
ONBOOT="yes"
#IPADDR="192.168.10.210" //注释掉这几行
#PREFIX="24"
#GATEWAY="192.168.10.1"
#DNS1="8.8.8.8"
重启网卡服务
[root@openstack network-scripts]# systemctl restart network
查看网卡
[root@openstack network-scripts]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.0894ef518b22 no eno1
virbr0 8000.52540095d7c2 yes virbr0-nic
查看ip信息
[root@openstack network-scripts]# ifconfig |head -20
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.10.210 netmask 255.255.255.0 broadcast 192.168.10.255
inet6 fe80::a94:efff:fe51:8b22 prefixlen 64 scopeid 0x20<link>
ether 08:94:ef:51:8b:22 txqueuelen 1000 (Ethernet)
RX packets 856 bytes 52981 (51.7 KiB)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 120 bytes 23450 (22.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 08:94:ef:51:8b:22 txqueuelen 1000 (Ethernet)
RX packets 10077 bytes 793083 (774.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1184 bytes 228415 (223.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16
eno2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 08:94:ef:51:8b:23 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
[root@openstack network-scripts]# ping www.baidu.com
PING www.a.shifen.com (61.135.169.121) 56(84) bytes of data.
64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=1 ttl=55 time=2.08 ms
64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=2 ttl=55 time=1.80 ms
........
4）安装libvirt及kvm
libvirt是管理虚拟机的API库，不仅支持KVM虚拟机，也可以管理Xen等方案下的虚拟机。
[root@kevin ~]# yum -y install libcanberra-gtk2 qemu-kvm.x86_64 qemu-kvm-tools.x86_64 libvirt.x86_64 libvirt-cim.x86_64 libvirt-client.x86_64
libvirt-java.noarch libvirt-python.x86_64 libiscsi-1.7.0-5.el6.x86_64 dbus-devel virt-clone tunctl virt-manager libvirt libvirt-python python-virtinst
由于要用virt-manager图形化安装虚拟机，所以还需要安装X-window（这个在前面部署VNC环境里就已经安装了）
[root@kevin ~]# yum groupinstall "X Window System"
安装中文字符，解决界面乱码问题
[root@kevin ~]# yum install -y dejavu-lgc-sans-fonts
[root@kevin ~]# yum groupinstall -y "Fonts"
启用libvirt
[root@kevin ~]# systemctl enable libvirtd
[root@kevin ~]# systemctl start libvirtd
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