./configure   --prefix=/usr   --conf-path=/etc/nginx/nginx.conf   --pid-path=/var/run/nginx.pid   --lock-path=/var/lock/nginx.lock   --http-log-path=/var/log/nginx/access.log   --error-log-path=/var/log/nginx/error.log   --http-client-body-temp-path=/var/lib/nginx/body   --http-proxy-temp-path=/var/lib/nginx/proxy   --http-fastcgi-temp-path=/var/lib/nginx/fastcgi   --http-uwsgi-temp-path=/var/lib/nginx/uwsgi   --http-scgi-temp-path=/var/lib/nginx/scgi   --with-http_ssl_module   --with-http_stub_status_module   --user=nginx   --group=nginx   --without-mail_pop3_module   --without-mail_imap_module   --without-mail_smtp_module --with-http_gzip_static_module; make && make install

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

server {
  listen 80;

  root /path/to/app/current/public;
  server_name app.domain.com;
  access_log /var/log/nginx/app-access.log;
  error_log /var/log/nginx/app-error.log;
  rewrite_log on;

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

    if (!-f $request_filename) {
      proxy_pass http://demoapp;    }
  }


  location ~* (stylesheets|javascripts|images) {
    if (!-f $request_filename) {
      break;
    }
    if ($query_string ~* "^[0-9]{10}$") {
      expires max;
      break;
    }
  }

  error_page 500 502 503 504 /500.html;
  location = /500.html {
    root /path/to/app/current/public;
  }
}

app_root = "/root/path/of/app"
app_name = "demoapp"
listen "/tmp/app.sock", :backlog => 2048 #這邊要跟nginx虛擬主機檔中upstream內定義的務必一樣
worker_processes 4 #看情況開
preload_app false
timeout 30

module Rails
  class <<self
    def root
      File.expand_path(__FILE__).split('/')[0..-3].join('/')
    end
  end
end
_working_directory = File.join(app_root, app_name, "current")
working_directory _working_directory
logs_path = "#{_working_directory}/log"
pid "#{_working_directory}/tmp/pids/unicorn.pid"
stderr_path "#{logs_path}/unicorn.stderr.log"
stdout_path "#{logs_path}/unicorn.stdout.log"

GC.respond_to?(:copy_on_write_friendly=) and GC.copy_on_write_friendly = true

before_fork do |server, worker|
  defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!

  old_pid = "#{Rails.root}/tmp/pids/unicorn.pid.oldbin"
  if File.exists?(old_pid) && server.pid != old_pid
    begin
      Process.kill("QUIT", File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
      puts "Send 'QUIT' signal to unicorn error!"
    end
  end
end

after_fork do |server, worker|
  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
end