nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)解决

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

报错信息

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] socket() [::]:80 failed (97: Address family not supported by protocol)
定位方法

1.先使用ps -e | grep nginx查看是否已经启动了nginx

2.如果没有的话则按照提示，查看0.0.0.0:80端口谁占用了，使用netstat -ltunp命令，可以看到

可以看到0.0.0.0:80端口被nginx -g daemon进程占用了。

解决方案：kill -s 9 对应的pid

然后再次启动nginx就解决问题了。