centos7配置网桥

在Centos7上玩KVM的话一定要配置网桥的:

[root@localhost nb]# ls /etc/sysconfig/network-scripts
ifcfg-8866        ifdown       ifdown-isdn    ifdown-TeamPort  ifup-ib     ifup-post      ifup-tunnel        network-functions-ipv6
ifcfg-br0         ifdown-bnep  ifdown-post    ifdown-tunnel    ifup-ippp   ifup-ppp       ifup-wireless
ifcfg-CCAP_guest  ifdown-eth   ifdown-ppp     ifup             ifup-ipv6   ifup-routes    init.ipv6-global
ifcfg-enp0s25     ifdown-ib    ifdown-routes  ifup-aliases     ifup-isdn   ifup-sit       keys-8866
ifcfg-iPak        ifdown-ippp  ifdown-sit     ifup-bnep        ifup-plip   ifup-Team      keys-iPak
ifcfg-lo          ifdown-ipv6  ifdown-Team    ifup-eth         ifup-plusb  ifup-TeamPort  network-functions

 上面的是配置好的,可以看到新增的文件ifcfg-br0

接下来看看ifcfg-br0 和ifcfg-enp0s25网卡文件:

# cat /etc/sysconfig/network-scripts/ifcfg-br0 
TYPE=Bridge
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
DEVICE=br0
ONBOOT=yes
# cat /etc/sysconfig/network-scripts/ifcfg-enp0s25 
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp0s25
UUID=cfe5e123-26a1-4f1d-bcd0-ec8a7a91c82f
DEVICE=enp0s25
ONBOOT=yes
BRIDGE=br0 #只是增加 了这么一条!!!

 重启网卡enp0s25(每个机器的名子不同)

ifdown enp0s25 #先关闭然后重启网卡
# systemctl restart network
查看成功后的ip:
[root@localhost nb]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000
    link/ether 54:xx:75:4e:37:d9 brd ff:ff:ff:ff:ff:ff
3: wlp4s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 02:d7:e5:72:e5:c8 brd ff:ff:ff:ff:ff:ff
5: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000
    link/ether 52:54:x0:fe:e5:29 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
6: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000
    link/ether 52:xx:00:fe:e5:29 brd ff:ff:ff:ff:ff:ff
7: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether fe:54:00:d6:81:e8 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc54:ff:fed6:81e8/64 scope link 
       valid_lft forever preferred_lft forever
8: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
    link/ether 54:ee:75:4e:37:d9 brd ff:ff:ff:ff:ff:ff
    inet 10.100.0.19/24 brd 10.100.0.255 scope global dynamic br0 #可以看到ip
       valid_lft 86368sec preferred_lft 86368sec
    inet6 fe80::56ee:75ff:fe4e:37d9/64 scope link 
       valid_lft forever preferred_lft forever

 查看网桥:

# brctl show
bridge name	bridge id		STP enabled	interfaces
br0		8000.54ee754e37d9	no		enp0s25
virbr0		8000.525400fee529	yes		virbr0-nic