Example deploy.rb for Capistrano

deploy.rb

def run_remote_rake(rake_cmd)
  rake_args = ENV['RAKE_ARGS'].to_s.split(',')
  cmd = "cd #{fetch(:latest_release)} && #{fetch(:rake, "rake")} RAILS_ENV=#{fetch(:rails_env, "production")} #{rake_cmd}"
  cmd += "['#{rake_args.join("','")}']" unless rake_args.empty?
  run cmd
  set :rakefile, nil if exists?(:rakefile)
end

require 'rvm/capistrano'

# Bundler
set :bundle_roles, [:app]
require 'bundler/capistrano'
load 'deploy/assets'

set :git_name, "jancel"
set :user, 'deployment'
set :application, "listr"

default_run_options[:pty] = true
set :repository, "git@bitbucket.org:#{git_name}/#{application}.git"

set :scm, :git
# Or: `accurev`, `bzr`, `cvs`, `darcs`, `git`, `mercurial`, `perforce`, `subversion` or `none`

set :deploy_to, "/home/#{user}/#{application}"
set :git_shallow_clone, 1
set :keep_releases,     5


set :branch do
  default_tag = `git tag`.split("\n").last
  tag = Capistrano::CLI.ui.ask "Tag to deploy (make sure to push the tag first): [#{default_tag}] "
  tag.empty? ? default_tag : tag
end

set :use_sudo, false
server '10.10.10.10', :web, :app, :db, :primary => true

ssh_options[:keys] = [File.join(ENV['HOME'], 'id_rsa')]
ssh_options[:port] = 22
ssh_options[:forward_agent] = true
ssh_options[:paranoid] = false

namespace :custom do
  desc "Add config symlinks"
  task :links, :roles => :app do
    #["database", "application","features"].each do | cfg |
      cfg = "database"
      run <<-CMD
        ln -s #{shared_path}/config/#{cfg}.yml #{release_path}/config/#{cfg}.yml
      CMD
    #end
  end

  desc "Run db seeding"
  task :seed, :roles => :app do
    run_remote_rake "db:seed"
  end
end

set :unicorn_pid do
  "#{shared_path}/pids/unicorn.pid"
end

after "bundle:install", "custom:links"
#after "custom:links", "deploy:assets:precompile"
#before "deploy:assets:precompile", "bundle:install"
#after "bundle:install", "custom:links"
#before "deploy:migrate", "custom:seed"
#after "deploy:migrate", "custom:seed"

# remove old releases
after "deploy", "deploy:cleanup"

namespace :deploy do
  task :start do
    top.unicorn.start
    #top.resque.start
  end

  task :stop do
    top.unicorn.stop
    #top.resque.stop
  end

  task :restart do
    top.unicorn.reload
    #top.resque.restart
  end
end


namespace :unicorn do
  desc "start unicorn"
  task :start, :roles => :app do
    run "cd #{current_path} && bundle exec unicorn -c config/unicorn.rb -E #{rails_env} -D"
  end

  desc "stop unicorn"
  task :stop, :roles => :app do
    run "#{try_sudo} kill -s QUIT `cat #{unicorn_pid}`"
  end

  desc "restart unicorn"
  task :restart, :roles => :app do
    top.unicorn.stop
    top.unicorn.start
  end

  desc "reload unicorn (gracefully restart workers)"
   task :reload, :roles => :app do
     run "#{try_sudo} kill -s USR2 `cat #{unicorn_pid}`"
   end

  desc "reconfigure unicorn (reload config and gracefully restart workers)"
  task :reconfigure, :roles => :app do
    run "#{try_sudo} kill -s HUP `cat #{unicorn_pid}`"
  end
end

namespace :resque do
  desc "start workers"
  task :start, :roles => :app do
    run_remote_rake "resque:start_workers"
  end

  desc "stop worlers"
  task :stop, :roles => :app do
    run_remote_rake "resque:stop_workers"
  end

  desc "restart workers"
  task :restart, :rolse => :app do
    run_remote_rake "resque:restart_workers"
  end
end


#set :application, "set your application name here"
#set :repository,  "set your repository location here"

# set :scm, :git # You can set :scm explicitly or Capistrano will make an intelligent guess based on known version control directory names
# Or: `accurev`, `bzr`, `cvs`, `darcs`, `git`, `mercurial`, `perforce`, `subversion` or `none`

#role :web, "your web-server here"                          # Your HTTP server, Apache/etc
#role :app, "your app-server here"                          # This may be the same as your `Web` server
#role :db,  "your primary db-server here", :primary => true # This is where Rails migrations will run
#role :db,  "your slave db-server here"

# if you want to clean up old releases on each deploy uncomment this:
# after "deploy:restart", "deploy:cleanup"

# if you're still using the script/reaper helper you will need
# these http://github.com/rails/irs_process_scripts

# If you are using Passenger mod_rails uncomment this:
# namespace :deploy do
#   task :start do ; end
#   task :stop do ; end
#   task :restart, :roles => :app, :except => { :no_release => true } do
#     run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}"
#   end
# end

Gemfile

source 'https://rubygems.org'

gem 'rails', "3.2.10"

# omitted

group :stage, :production do
  gem 'pg'
  gem 'unicorn'
end



# Gems used only for assets and not required
# in production environments by default.
group :assets do
 gem 'coffee-rails', '~> 3.2.1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  gem 'therubyracer', :platforms => :ruby
  gem 'libv8'
  
  gem 'uglifier', '>= 1.0.3'
end

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# To use Jbuilder templates for JSON
# gem 'jbuilder'

# Use unicorn as the app server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
group :test do
  gem 'cucumber-rails', :require => false
  gem 'database_cleaner'
  gem 'simplecov', :require => false
  gem 'launchy', :require => false
  gem 'mocha'
  # gem 'email_spec'
end

group :development, :test do
  gem 'debugger'
  gem 'rspec-rails'
  gem 'capybara'
  gem 'sqlite3'
  gem 'vcr'
  gem 'fakeweb'
  gem 'shoulda-matchers'
  gem 'factory_girl_rails'
end

group :development do
  gem 'capistrano'
  gem 'rvm-capistrano'
end