配置KVM虚拟机仅主机模式

安装 KVM 所需组件

yum 源提供了，直接安装：

yum install -y qemu-kvm libvirt virt-manager

安装完成后启动 libvirtd 服务：

service libvirtd start

会自动启动一个桥设备，这相当于 VMware Workstation 中的 host-only 仅主机的网络设备；

ifconfig

eth0     Link encap:Ethernet  HWaddr00:0C:29:3E:63:26 
	inet addr:172.16.31.7 Bcast:172.16.255.255 Mask:255.255.0.0
	inet6 addr: fe80::20c:29ff:fe3e:6326/64 Scope:Link
	UP BROADCAST RUNNING MULTICAST MTU:1500  Metric:1
	 RX packets:25460 errors:0 dropped:0overruns:0 frame:0
	TX packets:9728 errors:0 dropped:0 overruns:0 carrier:0
	collisions:0 txqueuelen:1000
	RX bytes:35156437 (33.5 MiB)  TXbytes:800196 (781.4 KiB)
lo       Link encap:Local Loopback 
	inet addr:127.0.0.1 Mask:255.0.0.0
	inet6 addr: ::1/128 Scope:Host
	UP LOOPBACK RUNNING MTU:65536  Metric:1
	RX packets:12 errors:0 dropped:0 overruns:0 frame:0
	TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
	collisions:0 txqueuelen:0
	RX bytes:1024 (1024.0 b)  TXbytes:1024 (1024.0 b)
virbr0   Link encap:Ethernet  HWaddr52:54:00:30:54:41 
	inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
	UP BROADCAST RUNNING MULTICAST MTU:1500  Metric:1
	RX packets:0 errors:0 dropped:0 overruns:0 frame:0
	TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
	collisions:0 txqueuelen:0
	RX bytes:0 (0.0 b)  TX bytes:0(0.0 b)

使用网桥管理命令查看：

brctl show

bridge name     bridge id               STP enabled     interfaces
virbr0          8000.525400305441       yes             virbr0-nic