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Something has triggered an error on your website. This is the default error page for nginx that is distributed with EPEL. It is located /usr/share/nginx/html/50x.html
You should customize this error page for your own site or edit the error_page directive in the nginx configuration file /etc/nginx/nginx.conf.
去看nginx具体的错误日志啊
你应该启动你的PHP引擎
service php-fpm start
从错误提示上看,不一定是你
nginx
配置问题,你需要看看你项目配置是不是符合对应访问机制,再结合错误日志查查看