centos7 nginx报错解决: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

升级了一下服务器出现了 无法重启,nginx报了如下错误:
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

这种情况是:80端口被占用了。
执行如下命令:
fuser -k 80/tcp
然后执行重启nginx命令:
systemctl restart nginx.service
或者执行
/usr/local/nginx/sbin/nginx -s reload

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