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