安装完KVM，默认是用NAT的，我们配置网桥模式，
好了，我们省去多余的，直接开始配置
环境：Red Hat Enterprise Linux Server release 6.5
默认网卡：ifcfg-em1
一、通过配置文件配置桥接设备，配置文件请自行备份
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[root@dm01 network-scripts]
# cat ifcfg-em1
DEVICE=em1
TYPE=Ethernet
UUID=45ed4581-ffea-4a88-8bf9-5784dae9abaa
ONBOOT=
yes
NM_CONTROLLED=
yes
BOOTPROTO=none
NAME=
"System em1"
HWADDR=F8:BC:12:4D:A4:DA
LAST_CONNECT=1427979794
BRIDGE=br0
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我们新建ifcfg-br0
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[root@dm01 network-scripts]
#vi ifcfg-br0
DEVICE=br0
TYPE=Bridge
ONBOOT=
yes
BOOTPROTO=static
IPADDR=192.168.1.251
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DEFAULT=
yes
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参数详解：
ifcfg-eth0
Device 指定网卡设备名
TYPE 指定网卡的类型为以太网卡
ONBOOT 指定网卡是否开机启动，切记要设置为yes
BRIDGE 指定桥接设备，此处指定为br0设备
建议：以上变量（非变量值）均为大写。
ifcfg-br0
Device 指定网卡设备名
TYPE 指定网卡的类型为桥接
ONBOOT 指定网卡是否开机启动，切记要设置为yes
BOOTPROTO 指定网卡启动如何获取IP地址，设置静态
IPADDR 设置br0绑定的IP地址
NETMASK 设置子网掩码地址
GATEWAY 设置网关
二、建议停止NetworkManager 服务，这个服务挺讨厌
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[root@master ~]
# service NetworkManager stop
[root@master ~]
#chkconfig NetworkManager off
[root@master ~]
# service network restart
[root@dm01 network-scripts]
# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 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
inet6 ::1
/128
scope host
valid_lft forever preferred_lft forever
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link
/ether
f8:
bc
:12:4d:a4:da brd ff:ff:ff:ff:ff:ff
inet6 fe80::fabc:12ff:fe4d:a4da
/64
scope link
valid_lft forever preferred_lft forever
3: em2: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000
link
/ether
f8:
bc
:12:4d:a4:
dc
brd ff:ff:ff:ff:ff:ff
12: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
link
/ether
f8:
bc
:12:4d:a4:da brd ff:ff:ff:ff:ff:ff
inet 192.168.1.251
/24
brd 192.168.1.255 scope global br0
inet6 fe80::fabc:12ff:fe4d:a4da
/64
scope link
valid_lft forever preferred_lft forever
13: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
link
/ether
fe:54:00:7c:9a:33 brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fe7c:9a33
/64
scope link
valid_lft forever preferred_lft forever
14: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500
link
/ether
fe:54:00:ad:52:0c brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fead:520c
/64
scope link
valid_lft forever preferred_lft forever
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我们已经配置完毕，用以下命令观察下
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[root@dm01 network-scripts]
# brctl show
bridge name bridge
id
STP enabled interfaces
br0 8000.f8bc124da4da no em1
vnet0
vnet1
[root@dm01 network-scripts]
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 br0
link-
local
* 255.255.0.0 U 1012 0 0 br0
default 192.168.1.1 0.0.0.0 UG 0 0 0 br0
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好了，KVM网桥已经配置，直接在KVM选择即可使用
本文转自 jackjiaxiong 51CTO博客，原文链接:http://blog.51cto.com/xiangcun168/1663247
