nginx.conf

upstream rails_app_server {
  # Coloque a porta que o thin vai rodar - nao coloque ele pra rodar na porta 80!
  server 127.0.0.1:3000;
}

server {
  listen 80;
  server_name seudominio;

  keepalive_timeout 5;

  # Location of our static files
  root /path/para/app/rails/public;

  error_page 500 502 503 504 /500.html;
  error_page 404 /404.html;

  # this rewrites all the requests to the maintenance.html
  # page if it exists in the doc root. This is for capistrano's
  # disable web task
  try_files $document_root/system/maintenance.html $uri $uri.html $uri/index.html @app;

  location @app {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    proxy_pass http://rails_app_server;
  }
}