linux下nginx报错Job for nginx.service failed because……

今天遇到一个nginx报错的问题

用这条命令service nginx restart重启nginx时，出现下面的回馈

Job for nginx.service failed because the control process exited with error code.

See “systemctl status nginx.service” and “journalctl -xe” for details.

这是nginx的80端口被占用导致，在nginx启动或者关闭过多的情况下出现

killall -9 nginx
service nginx restart