database.yml

staging:
  adapter: postgresql
  encoding: unicode
  database: myapp
  pool: 5
  username: myapp
  password: password
  host: localhost

secrets.yml

staging:
  admin_name: Admin
  admin_email: admin@mail.com
  admin_password: password
  domain_name: localhost
  secret_key_base: 123qwe

unicorn.rb

rails_env = ENV['RAILS_ENV'] || 'production'
rails_root = File.expand_path( File.dirname(__FILE__) + "/..")
pid '/home/myapp/application/shared/tmp/pids/unicorn.pid'
worker_processes 1
preload_app true
timeout 30
listen 3000
stderr_path rails_root + "/log/unicorn.stderr.log"
stdout_path rails_root + "/log/unicorn.stdout.log"
before_exec do |server|
  ENV["BUNDLE_GEMFILE"] = "/home/myapp/application/current/Gemfile"
end
before_fork do |server, worker|
  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
      # someone else did our job for us
    end
  end
end

after_fork do |server, worker|
  ActiveRecord::Base.establish_connection
  child_pid = server.config[:pid].to_s.sub('.pid', ".#{worker.nr}.pid")
  system("echo #{Process.pid} > #{child_pid}")
end