检查联网设置是否正确命令:ip addr
配置中关闭网络管理命令:chkconfig NetworkManager off
配置中开启网络管理命令:chkconfig network on
服务中关闭网络管理命令:service NetworkManager stop
服务中开启网络管理命令:service network start在最后一步servic network start时失败,出Job for network.service failed.