rhel 7/ol 7/centos 7 新部署完系统默认会生成一个virbr0 虚拟网卡，移除方式如下:
ifconfig virbr0 down
brctl delbr virbr0
nmcli device delete virbr0-nic
systemctl mask libvirtd.service --注销
systemctl disable libvirtd.service--停用
rhel 7/ol 7/centos 7 移除virbr0虚拟网卡
原文：https://www.cnblogs.com/oradba/p/14387528.html