# 需求：迁移环境母机在重启后，需要手动配置网桥
重启后，如下图示：
[root@host-10-123-98-218 ~]# ifconfig
eth1 Link encap:Ethernet HWaddr 00:E0:81:E6:6C:3B
inet addr:10.123.98.218 Bcast:10.123.98.255 Mask:255.255.255.192
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5374 errors:0 dropped:0 overruns:0 frame:0
TX packets:4010 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:584689 (570.9 KiB) TX bytes:575491 (562.0 KiB)
Memory:f7900000-f7920000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:163 errors:0 dropped:0 overruns:0 frame:0
TX packets:163 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:167824 (163.8 KiB) TX bytes:167824 (163.8 KiB)可以查看更多的网络情况
[root@host-10-123-98-218 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 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
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:e0:81:e6:6c:3a brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:e0:81:e6:6c:3b brd ff:ff:ff:ff:ff:ff
inet 10.123.98.218/26 brd 10.123.98.255 scope global eth1
valid_lft forever preferred_lft forever 查看当前网桥信息
[root@host-10-123-98-218 ~]# brctl show
bridge name bridge id STP enabled interfaces这里可以对比同一网络区域其他正常母机网络，如下:
[root@host-10-123-98-213 ~]# ifconfig
eth1 Link encap:Ethernet HWaddr 00:E0:81:E6:6B:BB #真实网卡
inet addr:10.123.98.213 Bcast:10.123.98.255 Mask:255.255.255.192
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1758313140 errors:0 dropped:0 overruns:0 frame:0
TX packets:1129411318 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:301531883354 (280.8 GiB) TX bytes:184138656905 (171.4 GiB)
Memory:f7900000-f7920000
eth1.3 Link encap:Ethernet HWaddr 00:E0:81:E6:6B:BB #添加的网桥
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:542897803 errors:0 dropped:0 overruns:0 frame:0
TX packets:114650555 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:33814358483 (31.4 GiB) TX bytes:22081251843 (20.5 GiB)
eucabr3 Link encap:Ethernet HWaddr 00:E0:81:E6:6B:BB # #添加的网桥
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:439499091 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:23134270803 (21.5 GiB) TX bytes:0 (0.0 b)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:158403403 errors:0 dropped:0 overruns:0 frame:0
TX packets:158403403 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:11455266584 (10.6 GiB) TX bytes:11455266584 (10.6 GiB)
vnet0 Link encap:Ethernet HWaddr FE:54:00:7E:8B:25 #虚拟机网卡
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:256 errors:0 dropped:439498799 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:15360 (15.0 KiB)
vnet1 Link encap:Ethernet HWaddr FE:0D:EB:DA:A9:43 #虚拟机网卡
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:114650555 errors:0 dropped:0 overruns:0 frame:0
TX packets:542897475 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:22081251843 (20.5 GiB) TX bytes:41255620926 (38.4 GiB)1、设置子网卡 eth1.3 #vconfig add eth1 3
2、创建网桥 #brctl addbr eucabr3
3、将eht1.3端口加入到网桥eucabr3 #brctl addif eucabr3 eth1.3
4、启动子网卡和网桥 ifconfig eth1.3 up;ifconfig eucabe3 up
[root@host-10-123-98-218 ~]# ifconfig
eth1 Link encap:Ethernet HWaddr 00:E0:81:E6:6C:3B
inet addr:10.123.98.218 Bcast:10.123.98.255 Mask:255.255.255.192
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:20978 errors:0 dropped:0 overruns:0 frame:0
TX packets:8223 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1682834 (1.6 MiB) TX bytes:1258355 (1.2 MiB)
Memory:f7900000-f7920000
eth1.3 Link encap:Ethernet HWaddr 00:E0:81:E6:6C:3B
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8419 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:394168 (384.9 KiB) TX bytes:0 (0.0 b)
eucabr3 Link encap:Ethernet HWaddr 00:E0:81:E6:6C:3B
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1505 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:71176 (69.5 KiB) TX bytes:0 (0.0 b)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:221 errors:0 dropped:0 overruns:0 frame:0
TX packets:221 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:172856 (168.8 KiB) TX bytes:172856 (168.8 KiB)查看母机上虚拟机状态，启动处于关闭状态的虚拟机
[root@host-10-123-98-218 ~]# virsh list
Id Name State
----------------------------------------------------
[root@host-10-123-98-218 ~]# virsh list --all
Id Name State
----------------------------------------------------
- i-C70462A7 shut off
- i-D69199A5 shut off
[root@host-10-123-98-218 ~]# vitsh start i-C70462A7
Hey! No command 'vitsh' found, did you mean 'virsh'?
[root@host-10-123-98-218 ~]# virsh start i-C70462A7
Domain i-C70462A7 started
[root@host-10-123-98-218 ~]# virsh dominfo i-C70462A7
Id: 12
Name: i-C70462A7
UUID: 5452a99f-9695-46d8-b7b6-92658d1e85d8
OS Type: hvm
State: running
CPU(s): 4
CPU time: 4.9s
Max memory: 3670016 KiB
Used memory: 3670016 KiB
Persistent: yes
Autostart: disable
Managed save: no
Security model: none
Security DOI: 0
[root@host-10-123-98-218 ~]# virsh list --all
Id Name State
----------------------------------------------------
12 i-C70462A7 running
- i-D69199A5 shut off
- 虚拟机正常启动，就表示母机网桥设置正常
[root@host-10-123-98-218 ~]# ping 10.123.7.87
PING 10.123.7.87 (10.123.7.87) 56(84) bytes of data.
64 bytes from 10.123.7.87: icmp_seq=1 ttl=63 time=0.312 ms
64 bytes from 10.123.7.87: icmp_seq=2 ttl=63 time=0.267 ms来源：https://blog.51cto.com/11620628/2431363