centos7安裝kvm
由於centos 7較之前的版本有了很大的變化，目前測試了centos 7 環境下kvm的安裝與搭建，具體如下。
一、安裝kvm 軟件
由於之前已做過較詳細的 kvm 的安裝與總結，這裏只大致列下步驟：
[root@zw ~]# yum -y install libvirt qemu-kvm virt-install libssh2 virt-viewer bridge-utils
[root@zw ~]# lsmod | grep kvm # make sure modules are loaded
kvm_intel 148081 0
kvm 461126 1 kvm_intel
vnc監聽 宿主的任何ip
echo 'vnc_listen = "0.0.0.0"'>> /etc/libvirt/qemu.conf
[root@zw ~]# systemctl start libvirtd
[root@zw ~]# systemctl enable libvirtd
注：centos7上服務的管理方式換成了systemctl 。
二、配置網卡橋接
centos7上默認已不再是eth0、eth1 ，我的pc server上安裝好的第一塊網卡變成了enp3s0 ，修改步驟和centos 6上沒有區別，如下
[root@zw ~]# cd /etc/sysconfig/network-scripts/
[root@zw network-scripts]# cat ifcfg-br0
TYPE=Bridge
BOOTPROTO=none
DEVICE=br0
ONBOOT=yes
IPADDR0=10.10.33.17
PREFIX0=24
GATEWAY0=10.10.33.1
[root@zw network-scripts]# cat ifcfg-enp3s0
DEVICE=enp3s0
TYPE=Ethernet
ONBOOT=yes
BRIDGE=br0
[root@zw ~]reboot
[root@zw network-scripts]# ifconfig
br0: flags=4163 mtu 1500
inet 10.10.33.17 netmask 255.255.255.0 broadcast 10.10.33.255
inet6 fe80::7a24:afff:fe46:ca60 prefixlen 64 scopeid 0x20
ether 78:24:af:46:ca:60 txqueuelen 0 (Ethernet)
RX packets 129 bytes 14676 (14.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 148 bytes 21994 (21.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp3s0: flags=4163 mtu 1500
ether 78:24:af:46:ca:60 txqueuelen 1000 (Ethernet)
RX packets 129 bytes 16482 (16.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 148 bytes 21994 (21.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 0 (Local Loopback)
RX packets 9 bytes 728 (728.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 9 bytes 728 (728.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099 mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether a6:88:9f:14:b2:66 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1 bytes 90 (90.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@zw network-scripts]# ip add show
1: lo: mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp3s0: mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000
link/ether 78:24:af:46:ca:60 brd ff:ff:ff:ff:ff:ff
3: br0: mtu 1500 qdisc noqueue state UP
link/ether 78:24:af:46:ca:60 brd ff:ff:ff:ff:ff:ff
inet 10.10.33.17/24 brd 10.10.33.255 scope global br0
valid_lft forever preferred_lft forever
inet6 fe80::7a24:afff:fe46:ca60/64 scope link
valid_lft forever preferred_lft forever
4: virbr0: mtu 1500 qdisc noqueue state DOWN
link/ether a6:88:9f:14:b2:66 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
注：由於ip 命令屬於iproute2軟件包中的工具，由於代替舊的ifconfig命令，儘可能的習慣使用新的命令和工具包來淘汰老的軟件和工具。
三、selinux防火牆關閉
# setenforce 0
# sed -i 's/=enforcing/=disabled/g' /etc/selinux/config
四、創建虛擬機：
# cd /data
# mkdir 10.10.33.200
# cd 10.10.33.200
創建虛擬磁盤
qemu-img create -f qcow2 system.qcow2 100G(自定義)
創建虛擬機(定義cpu/內存/網卡/系統安裝方式)
virt-install --name=10.10.33.200 --ram 2048 --vcpus=2 --arch=x86_64 --os-type=linux --os-variant='rhel6' --disk path=/data/10.10.33.200/system.qcow2,device=disk,bus=virtio,format=qcow2 --accelerate --pxe --graphics vnc,password=123456 --network bridge=br1 --force --autostart
常用命令：
virsh list 查看虛擬機狀態
Id Name State
----------------------------------------------------
2 10.10.33.200 running
virsh vncdisplay 虛擬機名稱 （查看虛擬機vnc端口號）
：0
virsh destroy 10.10.33.200 強制關閉虛擬機
virsh start 10.10.33.200 開啓虛擬機