KVM 虚拟化技术（二）之 bridge

1.进入到/etc/sysconfig/network-scripts/ 目录

[root@kvm ~]# cd /etc/sysconfig/network-scripts/
[root@kvm network-scripts]# ls
ifcfg-eth0   ifdown-ib    ifdown-ppp     ifup-aliases  ifup-ipv6   ifup-ppp       init.ipv6-global
ifcfg-lo     ifdown-ippp  ifdown-routes  ifup-bnep     ifup-isdn   ifup-routes    net.hotplug
ifdown       ifdown-ipv6  ifdown-sit     ifup-eth      ifup-plip   ifup-sit       network-functions
ifdown-bnep  ifdown-isdn  ifdown-tunnel  ifup-ib       ifup-plusb  ifup-tunnel    network-functions-ipv6
ifdown-eth   ifdown-post  ifup           ifup-ippp     ifup-post   ifup-wireless

2.复制当前 eth0 配置文件为 ifcfg-br0
[root@kvm network-scripts]# cp ifcfg-eth0 ifcfg-br0
3.修改 eth0 配置文件，末尾追加 BRIDGE=br0

[root@kvm network-scripts]# vi ifcfg-eth0

DEVICE=eth0
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
IPADDR=10.1.100.131
PREFIX=24
GATEWAY=10.1.100.2
DNS1=223.5.5.5
DOMAIN=223.6.6.6
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
BRIDGE=br0

4.修改 br0配置文件

DEVICE=br0
TYPE=Bridge
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp

5.重启网卡，并观察网卡信息变化

[root@kvm network-scripts]# /etc/init.d/network restart
正在关闭接口 eth0： bridge br0 does not exist!
														[确定]
关闭环回接口：                                             [确定]
弹出环回接口：                                             [确定]
弹出界面 eth0：                                            [确定]
弹出界面 br0：
正在决定 br0 的 IP 信息...完成。
														[确定]
[root@kvm network-scripts]# ifconfig
br0       Link encap:Ethernet  HWaddr 00:0C:29:5F:F4:17
		inet addr:10.1.100.131  Bcast:10.1.100.255  Mask:255.255.255.0
		inet6 addr: fe80::20c:29ff:fe5f:f417/64 Scope:Link
		UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
		RX packets:26 errors:0 dropped:0 overruns:0 frame:0
		TX packets:21 errors:0 dropped:0 overruns:0 carrier:0
		collisions:0 txqueuelen:0
		RX bytes:2070 (2.0 KiB)  TX bytes:2878 (2.8 KiB)

eth0      Link encap:Ethernet  HWaddr 00:0C:29:5F:F4:17
		inet6 addr: fe80::20c:29ff:fe5f:f417/64 Scope:Link
		UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
		RX packets:100644 errors:0 dropped:0 overruns:0 frame:0
		TX packets:20490 errors:0 dropped:0 overruns:0 carrier:0
		collisions:0 txqueuelen:1000
		RX bytes:129452127 (123.4 MiB)  TX bytes:1840714 (1.7 MiB)

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:8 errors:0 dropped:0 overruns:0 frame:0
		TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
		collisions:0 txqueuelen:0
		RX bytes:504 (504.0 b)  TX bytes:504 (504.0 b)

virbr0    Link encap:Ethernet  HWaddr 52:54:00:37:8D:EF
		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)

查看桥接接口

[root@kvm network-scripts]# brctl show
bridge name	bridge id		STP enabled	interfaces
br0		8000.000c295ff417	no		eth0
virbr0		8000.525400378def	yes		virbr0-nic
[root@kvm network-scripts]# brctl --help
Usage: brctl [commands]
commands:
	addbr     	<bridge>		add bridge
	delbr     	<bridge>		delete bridge
	addif     	<bridge> <device>	add interface to bridge
	delif     	<bridge> <device>	delete interface from bridge
	setageing 	<bridge> <time>		set ageing time
	setbridgeprio	<bridge> <prio>		set bridge priority
	setfd     	<bridge> <time>		set bridge forward delay
	sethello  	<bridge> <time>		set hello time
	setmaxage 	<bridge> <time>		set max message age
	sethashel 	<bridge> <int>		set hash elasticity
	sethashmax	<bridge> <int>		set hash max
	setmclmc  	<bridge> <int>		set multicast last member count
	setmcrouter	<bridge> <int>		set multicast router
	setmcsnoop	<bridge> <int>		set multicast snooping
	setmcsqc  	<bridge> <int>		set multicast startup query count
	setmclmi  	<bridge> <time>		set multicast last member interval
	setmcmi   	<bridge> <time>		set multicast membership interval
	setmcqpi  	<bridge> <time>		set multicast querier interval
	setmcqi   	<bridge> <time>		set multicast query interval
	setmcqri  	<bridge> <time>		set multicast query response interval
	setmcqri  	<bridge> <time>		set multicast startup query interval
	setpathcost	<bridge> <port> <cost>	set path cost
	setportprio	<bridge> <port> <prio>	set port priority
	setportmcrouter	<bridge> <port> <int>	set port multicast router
	show      	[ <bridge> ]		show a list of bridges
	showmacs  	<bridge>		show a list of mac addrs
	showstp   	<bridge>		show bridge stp info
	stp       	<bridge> {on|off}	turn stp on/off

文章作者：阿文

文章链接： https://www.awen.me/post/1106227057.html