centOS 7下更改完静态ip后发现network服务重启不了，尝试了各种方法，终于解决了。
报错消息：Job for network.service failed because the control process exited with error code.See "systemctl status network.service" and "journalctl -xe" for details.
解决办法：NetworkManager 服务有冲突，这个好解决，直接关闭 NetworkManger 服务就好了， service NetworkManager stop，并且禁止开机启动 chkconfig NetworkManager off 。之后重启就好了。

service NetworkManager stop
chkconfig NetworkManager off

虚拟机启动network服务失败，Job for network.service failed because the control process exited with error code问题