Sample deploy file

deploy.example.rb

lock '3.3.5'

set :application, 'app'
set :repo_url, ''

set :branch, 'master'

set :user, 'deploy'
set :deploy_to, '/var/www/app'

set :linked_files, %w{config/application.yml config/aws.yml config/database.yml config/secrets.yml}
set :linked_dirs, %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}

set :keep_releases, 5

set :normalize_asset_timestamps, %w{public/images public/javascripts public/stylesheets}

namespace :deploy do
  desc 'Restart application'
  task :restart do
    on roles(:app), in: :sequence, wait: 5 do
      execute :service, :unicorn, :upgrade

      within release_path do
        execute :bundle, :exec, :whenever, '--write-crontab'
      end
    end
  end

  after :publishing, :link_www do
    on roles(:app) do
      within release_path do
        execute :rm, '-f', '/var/www/current'
        execute :ln, '-s', release_path, '/var/www/current'
      end
    end
  end

  after :publishing, :restart
  after :publishing, "deploy:assets:precompile"

  web_servers = %w{}

  namespace :assets do
    task :precompile do
      run_locally do
        execute 'RAILS_ENV=production', :bundle, :exec, :rake, 'assets:precompile'
      end

      web_servers.each do |web_server|
        puts "Deploying to web server: #{web_server}"

        run_locally do
          execute :ssh, "www@#{web_server}", "mkdir -p #{release_path}"
          execute :rsync, "-av ./public www@#{web_server}:#{release_path}"
          execute :ssh, "www@#{web_server}", "rm -f #{deploy_to}/current"
          execute :ssh, "www@#{web_server}", "ln -s #{release_path} #{deploy_to}/current"
        end
      end

      run_locally do; execute :rm, '-rf public/assets'; end
    end
  end
end

production.example.rb

server 'app',
       user: 'deploy',
       port: 22,
       roles: %w{app db}