遇到的问题:   centos7 的本机地址Ping不通，是因为 network没开

开启network

命令:systemctl start network /   service network start

然后会报错:

 

 

 

网上查找之后: 

1.需要先将NetworkManager停掉

命令: systemctl stop NetworkManager

2.再开启network

命令:systemctl start network /   service network start