In CentOS 7 installation process if there is select the relevant service virtualization system after installation, you will find virbr0 private network address of the network card to have a bridge connecting the start card, this is because of the use of virtualization in the libvirtd generated by the service, it can be turned off if not required to remove:
First, check the IP and bridge equipment
[root@Node1 ~]# ip -4 addr //查看IP地址 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 inet 192.168.10.7/24 brd 192.168.10.255 scope global ens33 valid_lft forever preferred_lft forever 3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000 inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever [root@Node1 ~]# brctl show //查看网桥 bridge name bridge id STP enabled interfaces virbr0 8000.5254005caf00 yes virbr0-nic [root@Node1 ~]#
Second, remove the network bridge
[root @ Node1 ~] # ifconfig virbr0 Down [root @ Node1 ~] # brctl delbr virbr0 // delete bridge
Third, disable the power service
[root@Node1 ~]# systemctl disable libvirtd.service //禁用libvirtd服务开机自启动Removed symlink /etc/systemd/system/multi-user.target.wants/libvirtd.service. Removed symlink /etc/systemd/system/sockets.target.wants/virtlockd.socket. Removed symlink /etc/systemd/system/sockets.target.wants/virtlogd.socket. [root@Node1 ~]# systemctl mask libvirtd.service Created symlink from /etc/systemd/system/libvirtd.service to /dev/null.
Fourth, verification
[root@Node1 ~]# ip -4 add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 inet 192.168.10.7/24 brd 192.168.10.255 scope global ens33 valid_lft forever preferred_lft forever
***** After verification, it was found virbr0 been deleted ****