说明：之前在CentOS7下配置过bridge，现在讲bridge模式改为普通模式后，查看网卡的时候还是可以看到很多垃圾信息，想彻底删除自己不想要的网卡配置信息，操作如下:

[root@linux-node1 ~]# ip add list

1: lo: 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: mtu 1500 qdisc pfifo_fast state UP qlen 1000

link/ether 00:0c:29:9b:7d:d6 brd ff:ff:ff:ff:ff:ff

inet 10.10.10.11/24 brd 10.10.10.255 scope global eth0

valid_lft forever preferred_lft forever

inet6 fe80::20c:29ff:fe9b:7dd6/64 scope link

valid_lft forever preferred_lft forever

4: virbr0: mtu 1500 qdisc noqueue state DOWN qlen 1000

link/ether 52:54:00:f4:24:05 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: mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000

link/ether 52:54:00:f4:24:05 brd ff:ff:ff:ff:ff:ff

查看网络列表：

[root@linux-node1 ~]# virsh net-list

Name                State      Autostart    Persistent

----------------------------------------------------------

default              active    yes          yes

使用“virsh net-destroy default”删除

[root@linux-node1 ~]# virsh net-destroy default

Network default destroyed

从配置文件中剔除

[root@linux-node1 ~]# virsh net-undefine default

Network default has been undefined

重启libvirtd服务

[root@linux-node1 ~]# systemctl restart libvirtd.service

[root@linux-node1 ~]# virsh net-list

Name                State      Autostart    Persistent

----------------------------------------------------------

[root@linux-node1 ~]# ip add list

1: lo: 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: mtu 1500 qdisc pfifo_fast state UP qlen 1000

link/ether 00:0c:29:9b:7d:d6 brd ff:ff:ff:ff:ff:ff

inet 10.10.10.11/24 brd 10.10.10.255 scope global eth0

valid_lft forever preferred_lft forever

inet6 fe80::20c:29ff:fe9b:7dd6/64 scope link

valid_lft forever preferred_lft forever

再次查看，发现不必要的信息已经清除，清爽多了