nginx configuration file with server block unicorn ready.

nginx.conf

user deploy;
worker_processes 1;
pid /var/run/nginx.pid;

events {
  worker_connections 768;
	# multi_accept on;
}

http {

	##
	# Basic Settings
	##

	sendfile on;
	tcp_nopush on;
	tcp_nodelay on;
	keepalive_timeout 75;
	types_hash_max_size 2048;
	# server_tokens off;

	# server_names_hash_bucket_size 64;
	# server_name_in_redirect off;

	include /etc/nginx/mime.types;
	default_type application/octet-stream;

	##
	# Logging Settings
	##

	access_log /var/log/nginx/access.log;
	error_log /var/log/nginx/error.log;

	##
	# Gzip Settings
	##

	gzip on;
	gzip_disable "msie6";

	# gzip_vary on;
	# gzip_proxied any;
	# gzip_comp_level 6;
	# gzip_buffers 16 8k;
	# gzip_http_version 1.1;
	# gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

	##
	# nginx-naxsi config
	##
	# Uncomment it if you installed nginx-naxsi
	##

	#include /etc/nginx/naxsi_core.rules;

	##
	# Virtual Host Configs
	##

	include /etc/nginx/conf.d/*.conf;
	include /etc/nginx/sites-enabled/*;
}


#mail {
#	# See sample authentication script at:
#	# http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
# 
#	# auth_http localhost/auth.php;
#	# pop3_capabilities "TOP" "USER";
#	# imap_capabilities "IMAP4rev1" "UIDPLUS";
# 
#	server {
#		listen     localhost:110;
#		protocol   pop3;
#		proxy      on;
#	}
# 
#	server {
#		listen     localhost:143;
#		protocol   imap;
#		proxy      on;
#	}
#}

nginxserverblock.com

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

server {

  listen   80; ## listen for ipv4; this line is default and implied
  #listen   [::]:80 default ipv6only=on; ## listen for ipv6

  root /path/to/app;

  # change the wildcard with your domain, e.g example.com or *.example.com
  server_name _;

  location / {
     try_files $uri @unicorn_app;
  }

  location @unicorn_app {
    proxy_set_header  X-Real-IP        $remote_addr;
    proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
    proxy_set_header  Host             $http_host;
    proxy_redirect    off;
    proxy_pass        http://unicorn;
  }

  location ~ ^/(assets)/ {
    root /public;
    gzip_static on;
    expires 1y;
    add_header Cache-Control public;
    add_header ETag "";
  }

  location /doc/ {
    alias /usr/share/doc/;
    autoindex on;
    allow 127.0.0.1;
    deny all;
  }

  # Only for nginx-naxsi : process denied requests
  # location /RequestDenied {
  # For example, return an error code
  # return 418;
  #}

  error_page 404 /path/to/public/404.html;
  error_page 422 /path/to/public/422.html;

  ##
  # redirect server error pages to the static page /50x.html
  error_page 500 502 503 504 /50x.html;
  location = /50x.html {
    root /path/to/public/500.html;
  }

}


# HTTPS server
#
#server {
#	listen 443;
#	server_name localhost;
#
#	root html;
#	index index.html index.htm;
#
#	ssl on;
#	ssl_certificate cert.pem;
#	ssl_certificate_key cert.key;
#
#	ssl_session_timeout 5m;
#
#	ssl_protocols SSLv3 TLSv1;
#	ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv3:+EXP;
#	ssl_prefer_server_ciphers on;
#
#	location / {
#		try_files $uri $uri/ /index.html;
#	}
#}

production.rb

# uncomment this line.
config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx