centos7启动nginx失败Job for nginx.servicefailedbecause the control process exited with error code.

本文参考：https://www.cnblogs.com/hhyf/p/11518919.html
启动nginx失败：
Job for nginx.servicefailedbecause the control process exited with error code.See “systemctl status nginx.service” and “journalctl -xe” for details.

懂得查看日志很重要！

安装完成后使用
systemctl start nignx
出现
Job for nginx.servicefailedbecause the control process exited with error code.See “systemctl status nginx.service” and “journalctl -xe” for details.
再查看nginx状态

systemctl status nginx.service

address alreadly in use 说明端口被占用
查看被什么占用
命令： netstat -apn|grep :80

可以看到977/httpd 占用了端口，需要将服务关闭
命令：service httpd stop

然后再重启nginx就可以启动
（应该直接重新启动nginx即可，我重新启动了虚拟机）