早上发现百度都打不开了
然后重启了网络服务
发现以下报错

● network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: Failed (Result: exit-code) since 日 2017-11-12 11:58:03 CST; 18s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 3310 ExecStart=/etc/rc.d/init.d/network start (code=exited,status=1/FAILURE)

百度发现了一个解决方案 关掉 系统自带的NetworkManager这个管理套件

systemctl stop NetworkManager
systemctl disable NetworkManager

重新启动网络：

systemctl start network.service

参考文章 http://www.jb51.cc/article/p-ecfpcoum-qr.html