KVM之网桥创建（ubuntu 环境）
1、创建网桥的目的是为了让KVM虚拟机连接到这个网桥，从而使虚拟机可以和物理网络通信
2、当然，安装完kvm后，会自动建立一个网桥virbr0，这个网桥应该是nat模式
一、DHCP网桥创建
vim /etc/network/interfaces
这是interfaces配置文件的内容：
#Thisfiledescribesthenetworkinterfacesavailableonyoursystem #andhowtoactivatethem.Formoreinformation,seeinterfaces(5). #Theloopbacknetworkinterface autolo ifaceloinetloopback #Theprimarynetworkinterface autoeth0 ifaceeth0inetdhcp物理网卡也为DHCP autobr100 ifacebr100inetdhcp配置br100网桥为DHCP bridge_portseth0配置br100建立在物理网卡eth0上 bridge_stpoff bridge_fd
创建完成后，重启网络
静态网桥
vim /etc/network/interfaces
#Thisfiledescribesthenetworkinterfacesavailableonyoursystem #andhowtoactivatethem.Formoreinformation,seeinterfaces(5). #Theloopbacknetworkinterface autolo ifaceloinetloopback #Theprimarynetworkinterface autoeth0 ifaceeth0inetstatic address192.168.89.3 gateway192.168.89.2 netmask255.255.255.0 network192.168.89.0 broadcast192.168.89.255 autobr100 ifacebr100inetstatic bridge_portseth0 bridge_stpoff bridge_fd0 bridge_maxwait0 address192.168.89.3 network192.168.89.0 netmask255.255.255.0 broadcast192.168.89.255 gateway192.168.89.2
创建完成后，重启网络
