Capistrano deploy.rb for nginx + rvm + unicorn + delayed_job on Ubuntu LTS 12.x (2013)

deploy.rb

require 'capistrano/calendar/recipes'
require 'bundler/capistrano'
require "rvm/capistrano"
load 'deploy/assets'

set :user, 'deployuser'
set :application, 'applicationname'
set :rvm_type, :system
set :rvm_ruby_string, "ruby-1.9.3-p392@#{application}"

set :bundle_flags, "--deployment --quiet --binstubs --shebang ruby-local-exec"

set :deploy_to, "/home/#{user}/#{application}"
set :keep_releases, 3
set :rails_env, "production"

set :unicorn_conf, "#{deploy_to}/current/config/unicorn.rb"
set :unicorn_pid,  "#{deploy_to}/shared/pids/unicorn.pid"

set :scm, "git"
set :scm_command, "git"
set :repository, "git@bitbucket.org:youraccount/#{application}.git"
set :deploy_via, :remote_cache
set :scm_verbose, true
set :use_sudo, false

ssh_options[:forward_agent] = true
default_run_options[:pty] = true

set :branch, ENV['BRANCH'] ? ENV['BRANCH'] : "master"

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

namespace :deploy do
  task :start do
    ;
  end
  task :stop do
    ;
  end
  task :restart, :roles => :app, :except => {:no_release => true} do
    ;
  end
end

namespace :serverstuff do
  desc "link server specific scripts"
  task :symlink do
    run "sudo ln -s -f #{current_path}/config/#{application}.nginx.conf /etc/nginx/sites-enabled/#{application}"
  end
  desc "reload nginx"
  task :reload do
    run "sudo service nginx reload"
  end

  after 'deploy:create_symlink', 'serverstuff:symlink'
  after 'serverstuff:symlink', 'serverstuff:reload'
end

namespace :unicorn do
  desc "start unicorn"
  task :start, :roles => :app, :except => {:no_release => true} do
    run "cd #{current_path} && unicorn -c #{current_path}/config/unicorn.rb -E #{rails_env} -D"
  end
  desc "stop unicorn"
  task :stop, :roles => :app, :except => {:no_release => true} do
    run "#{try_sudo} kill -TERM `cat #{unicorn_pid}`"
  end
  desc "graceful stop unicorn"
  task :graceful_stop, :roles => :app, :except => {:no_release => true} do
    run "#{try_sudo} kill -QUIT `cat #{unicorn_pid}`"
  end
  desc "reload unicorn"
  task :reload, :roles => :app, :except => {:no_release => true} do
    run "#{try_sudo} kill -HUP `cat #{unicorn_pid}`"
  end

  after "deploy:restart", "unicorn:reload"
  after "deploy:start", "unicorn:start"
  after "deploy:stop", "unicorn:stop"
end

namespace :delayed_job do
  desc "Restart the delayed_job process"
  task :restart, :roles => :app do
    run "cd #{current_path}; RAILS_ENV=#{rails_env} script/delayed_job restart"
  end

  task :stop, :roles => :app do
    run "cd #{current_path}; RAILS_ENV=#{rails_env} script/delayed_job stop"
  end

  task :start, :roles => :app do
    run "cd #{current_path}; RAILS_ENV=#{rails_env} script/delayed_job start"
  end

  after "unicorn:reload", "delayed_job:restart"
  after "unicorn:start", "delayed_job:start"
  after "unicorn:stop", "delayed_job:stop"
end