在CentOS 7的安裝過程中如果有選擇相關虛擬化的的服務安裝系統後，啟動網絡卡時會發現有一個以網橋連線的私網地址的virbr0網絡卡，這個是因為在虛擬化中有使用到libvirtd服務生成的，如果不需要可以關閉後去掉：

 一、檢視IP及網橋裝置

[root@Node1 ~]# ip -4 addr    //檢視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    //檢視網橋
bridge name     bridge id               STP enabled     interfaces
virbr0          8000.5254005caf00       yes             virbr0-nic
[root@Node1 ~]#

 二、刪除網橋

[root@Node1 ~]# ifconfig virbr0 down   
[root@Node1 ~]# brctl delbr virbr0   //刪除網橋 

 三、禁用開機服務

[root@Node1 ~]# systemctl disable libvirtd.service    //禁用libvirtd服務開機自啟動
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.

 四、驗證

[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 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

 *****經過驗證，發現virbr0已經刪除****