之前装好的CentOS7虚拟机是可以运行的，今天用Xshell突然就连不上去，经检查发现网卡启动不了。百度下发现贴吧上的答案真的太水了，一堆复制粘贴不负责任的。顺便记录下自己的解决方法，以便日后忘记。

具体报错如下：

Restarting network (via systemctl):  Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.

[失败]

使用命令 systemctl status network 查看报错：Failed to start LSB: Bring up/down networking.

解决方法：系统自带的NetworkManager这个管理套件影响到网卡的启动，关掉就可以解决。

systemctl stop NetworkManager		//停止NetworkManager
systemctl disable NetworkManager	//并使其失效，开机不启动
systemctl start network			//启动网络后就OK了