使用ip a命令查看虚拟机的网卡信息

发现有一个虚拟网卡virbr0

[root@localhost ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:00:42:09 brd ff:ff:ff:ff:ff:ff
    inet 192.168.218.3/24 brd 192.168.218.255 scope global noprefixroute ens32
       valid_lft forever preferred_lft forever
    inet6 fe80::a4c6:2f0e:8637:20a4/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:27:c0:50 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

在CentOS 7的安装过程中如果有选择相关虚拟化的的服务安装系统后，启动网卡时会发现有一个以网桥连接的私网地址的virbr0网卡，这个是因为在虚拟化中有使用到libvirtd服务生成的

查看网桥  brctl show

[root@localhost ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
docker0         8000.0242eabff5ec       no
virbr0          8000.52540027c050       yes             virbr0-nic

删除网桥 brctl delbr virbr0

[root@localhost ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
docker0         8000.0242eabff5ec       no
virbr0          8000.52540027c050       yes             virbr0-nic
[root@localhost ~]# brctl delbr virbr0
[root@localhost ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
docker0         8000.0242eabff5ec       no
[root@localhost ~]#

systemctl disable libvirtd.service 禁用服务开机自启

[root@localhost ~]# systemctl disable libvirtd.service
Removed symlink /etc/systemd/system/multi-user.target.wants/libvirtd.service.
Removed symlink /etc/systemd/system/sockets.target.wants/virtlogd.socket.
Removed symlink /etc/systemd/system/sockets.target.wants/virtlockd.socket.
[root@localhost ~]#