场景说明：KVM虚拟机之前没有设置为Bridge模式，然后就直接创建虚拟机了（当时网卡模式选择的为default），后来调整KVM网卡模式为Bridge后，虚拟机没法正常联网。
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[root@node160 ~]# virsh shudown CentOS-7.3-X86_64
[root@node160 ~]# virsh edit CentOS-7.3-X86_64
将xml配置文件中的: <interface type='network'>
<mac address='52:54:00:e4:7c:77'/>
<source network='default'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
修改为： <interface type='bridge'>
<mac address='52:54:00:e4:7c:77'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
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由于kvm虚拟机使用的是bridge模式，可以把virbr0接口（即NAT方式里面的default虚拟网络）删除
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[root@node160 ~]# ip add list
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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000 link/ether 00:0c:29:14:2b:9a brd ff:ff:ff:ff:ff:ff
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000 link/ether 52:54:00:9f:ad:48 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
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000 link/ether 52:54:00:9f:ad:48 brd ff:ff:ff:ff:ff:ff
7: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000 link/ether 00:0c:29:14:2b:9a brd ff:ff:ff:ff:ff:ff
inet 10.10.10.160/24 brd 10.10.10.255 scope global br0
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe14:2b9a/64 scope link
valid_lft forever preferred_lft forever
8: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN qlen 1000 link/ether fe:54:00:71:7b:aa brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fe71:7baa/64 scope link
valid_lft forever preferred_lft forever
10: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN qlen 1000 link/ether fe:54:00:e4:7c:77 brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fee4:7c77/64 scope link
valid_lft forever preferred_lft forever
[root@node160 ~]# virsh net-list --all
Name State Autostart Persistent
---------------------------------------------------------- default active yes yes
[root@node160 ~]# brctl show
bridge namebridge idSTP enabledinterfacesbr08000.000c29142b9anoeth0vnet0vnet1virbr08000.5254009fad48yesvirbr0-nic[root@node160 ~]# virsh net-destroy default
Network default destroyed[root@node160 ~]# virsh net-undefine default
Network default has been undefined |
配置完成后，再次查看网卡信息
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[root@node160 ~]# ip add list
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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000 link/ether 00:0c:29:14:2b:9a brd ff:ff:ff:ff:ff:ff
7: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000 link/ether 00:0c:29:14:2b:9a brd ff:ff:ff:ff:ff:ff
inet 10.10.10.160/24 brd 10.10.10.255 scope global br0
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe14:2b9a/64 scope link
valid_lft forever preferred_lft forever
8: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN qlen 1000 link/ether fe:54:00:71:7b:aa brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fe71:7baa/64 scope link
valid_lft forever preferred_lft forever
10: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN qlen 1000 link/ether fe:54:00:e4:7c:77 brd ff:ff:ff:ff:ff:ff
inet6 fe80::fc54:ff:fee4:7c77/64 scope link
valid_lft forever preferred_lft forever
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本文转自 冰冻vs西瓜 51CTO博客，原文链接：http://blog.51cto.com/molewan/1926137，如需转载请自行联系原作者