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)

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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

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name 
tcp        0      0 127.0.0.1:10000             0.0.0.0:* LISTEN 1177/php-fpm tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1109/httpd tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 836/vsftpd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 823/sshd tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 1073/mysqld

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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）