今天上午发现网站，出现数据库连接错误，以为是mysql挂掉了呢。结果登录面板一看，是nginx停止服务了，于是我就尝试重启nginx服务，结果发现启动不了，出现如下提示：
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
![nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)](/uploads/allimg/200408/21112533a-0.png "nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)")
大概意思就是80端口被占用，习惯性重起服务器，结果发现重启后问题依旧，用SSH登录服务器查看端口，PID选项里面不显示是哪个占用这个端口。
![nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)](/uploads/allimg/200408/2111256496-1.png "nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)")
经查，我这个使用的是GD的服务器，它需要提供权限才能操作，所以执行了一下sudo su root
![nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)](/uploads/allimg/200408/2111255592-2.png "nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)")
然后再查看端口。终于有结果了
使用kill命令杀死占用的进程
kill 383
然后再重起nginx进行，成功。
感觉莫名其妙，没对服务器进行任何操作，为啥端口会被占用?
