nginx: [emerg] bind() to 0.0.0.0

使用systemctl start nginx启动nginx失败，

Job for nginx.service failed because the control process exited with error code.
See "systemctl status nginx.service" and "journalctl -xe" for details.

使用systemctl status nginx查询时，看到错误：nginx: [emerg] bind() to 0.0.0.0:8081 failed (98: Address already in use)

already in use.png
原因：有可能之前启动过的nginx影响到了，但还没有停用。
解决办法：

sudo pkill -f nginx & wait $!
sudo systemctl start nginx

running.png

Have fun.