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

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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httpd这个进程占用了（也就是apcache占用）