nginx.conf

 server {
      listen 80;
      listen 443 ssl;

      proxy_set_header X_FORWARDED_PROTO https;

      ssl_certificate /etc/nginx/certificate.crt;
      ssl_certificate_key /etc/nginx/certificate.key;

      server_name  XXXXXXXXXXXXXXXXXXX;
      try_files $uri /system/maintenance.html @passenger;

      location /get_500 {
          return 500;
      }
      location /get_502 {
          return 502;
      }
      location /get_503 {
          return 503;
      }
      location /get_504 {
          return 504;
      }
      location = /basic_status {
          stub_status;
      }

      location @passenger {
        passenger_enabled on;
        passenger_min_instances 2;
      }

      root /mnt/my.XXXXXXXXXXXXXXXXXXXXXXX/current/public;

      error_page 500 /500.html;
      error_page 502 503 504 @503;

      location = /50x.html {
        root /mnt/my.XXXXXXXXXXXXXXXXXX.com/current/public;
      }

      location = /404.html {
        root /mnt/my.XXXXXXXXXXXXXXXXXXXXXX.com/current/public;
      }

      location @503 {
        rewrite ^(.*)$ /errors/503.html break;
      }

      if (-f /system/maintenance.html) {
        return 503;
      }
    }