1.啟動nginx命令
./sbin/nginx
2.提示80端口被占用
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)
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)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] still could not bind()
3.執行netstat -antp查看誰占用了80端口
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:80 127.0.0.1:34932 TIME_WAIT -
4.通過調整內核參數解決
vi /etc/sysctl.conf
編輯文件，加入以下內容：
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30
然后執行/sbin/sysctl -p讓參數生效。
5.關閉窗口斷開連接，重新打開
80端口仍被占用
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1402/nginx: master
6.kill占用80端口的進程
7./sbin/nginx
此時，啟動nginx成功
執行命令 kill -9 1402
參考資料：https://blog.csdn.net/gzh0222/article/details/8491178