centos7 网卡启动不了，修复方法

刚刚装好的虚拟机突然不能上网了，报错很诡异，没有IP地址了.执行以下命令

systemctl stop NetworkManager

systemctl disable NetworkManager

Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service.

Removed symlink /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service.

Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service.

重新启动网络：

systemctl start network.service

ifconfig