启动nginx的时候报错
Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details.
考虑是端口占用：
```
ps -aux | grep nginx //检查nginx是否已经启动
pkill -9 nginx //如果已经启动结束即可
systemctl start nginx.service //启动
```
