nginx config for unicorn

nginx.conf

# you generally only need one nginx worker unless you're serving
# large amounts of static files which require blocking disk reads
worker_processes 1;
user nobody nogroup; # for systems with a "nogroup"

pid /tmp/nginx.pid;
error_log /tmp/nginx.error.log;

events {
  worker_connections 1024;
  accept_mutex off;
  use epoll; # enable for Linux 2.6+
}

http {
  include mime.types;
  default_type application/octet-stream;
  sendfile on;

  tcp_nopush on; 
  tcp_nodelay off; 

  gzip on;
  gzip_http_version 1.0;
  gzip_proxied any;
  gzip_min_length 500;
  gzip_disable "MSIE [1-6]\.";
  gzip_types text/plain text/html text/xml text/css
             text/comma-separated-values
             text/javascript application/x-javascript
             application/atom+xml;

  upstream app_server {
    server unix:/tmp/.sock fail_timeout=0;
  }

  server {
    client_max_body_size 4G;
    server_name _;
    keepalive_timeout 5;

    root /u/apps/yourappdirectory/current/public;

    try_files $uri/index.html $uri.html $uri @app;

    location ~ ^/(assets)/  {  
      root /u/apps/yourappdirectory/current/public;
      gzip_static on; # to serve pre-gzipped version  
      expires max;  
      add_header  Cache-Control public;  
    }  

    location @app {
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

      # enable this if and only if you use HTTPS, this helps Rack
      # set the proper protocol for doing redirects:
      # proxy_set_header X-Forwarded-Proto https;

      # pass the Host: header from the client right along so redirects
      # can be set properly within the Rack application
      proxy_set_header Host $http_host;

      # we don't want nginx trying to do something clever with
      # redirects, we set the Host: header above already.
      proxy_redirect off;

      # set "proxy_buffering off" *only* for Rainbows! when doing
      # Comet/long-poll/streaming.  It's also safe to set if you're using
      # only serving fast clients with Unicorn + nginx, but not slow
      # clients.  You normally want nginx to buffer responses to slow
      # clients, even with Rails 3.1 streaming because otherwise a slow
      # client can become a bottleneck of Unicorn.
      #
      # The Rack application may also set "X-Accel-Buffering (yes|no)"
      # in the response headers do disable/enable buffering on a
      # per-response basis.
      # proxy_buffering off;

      proxy_pass http://app_server;
    }

    # Rails error pages
    error_page 500 502 503 504 /500.html;
    location = /500.html {
      root /u/apps/yourappdirectory/current/public;
    }
  }
}