Deploy приложения на RoR 4 с помощью Capistrano 3

я использую ubuntu 12.04 LTS

sudo make install

Чтобы иметь доступ с локального компьютера в файле '/etc/postgresql/9.3/main/postgresql.conf' изменим параметр listen_addresses = 'localhost' на listen_addresses = '*' и добавим в файл '/etc/postgresql/9.3/main/pg_hba.conf' строчку
host all deployer ваш.внешний.ip.адрес 255.255.255.0 md5

set :rails_env, "production"
deploy_to = "/home/www/sites/#{application}"
set :unicorn_conf, "#{deploy_to}/current/config/unicorn.rb"
set :unicorn_pid, "#{deploy_to}/shared/pids/unicorn.pid"

namespace :deploy do

...

  desc 'Stop Unicorn'
  task :stop do
    on roles(:app) do
      if test("[ -f #{fetch(:unicorn_pid)} ]")
        execute :kill, capture(:cat, fetch(:unicorn_pid))
      end
    end
  end

  desc 'Start Unicorn'
  task :start do
    on roles(:app) do
      within current_path do
        with rails_env: fetch(:rails_env) do
          execute :bundle, "exec unicorn -c #{fetch(:unicorn_conf)} -D"
        end
      end
    end
  end

  desc 'Reload Unicorn without killing master process'
  task :reload do
    on roles(:app) do
      if test("[ -f #{fetch(:unicorn_pid)} ]")
        execute :kill, '-s USR2', capture(:cat, fetch(:unicorn_pid))
      else
        error 'Unicorn process not running'
      end
    end
  end

  desc 'Restart Unicorn'
  task :restart
  before :restart, :stop
  before :restart, :start

  after :finishing, 'deploy:cleanup'
  after :finishing, 'deploy:restart'

...

end