Deploy Sinatra Application with Capistrano

May 25, 2010  -  Comments

Step 0: Vendor the sinatra gem (optional).

  mkdir vendor
  cd vendor
  gem unpack sinatra
  mv sinatra-* sinatra

Step 1. Create a config.ru Rack file in your project's root directory.

  require 'rubygems'
  require 'vendor/sinatra/lib/sinatra.rb'

  set :public, File.expand_path(File.dirname(__FILE__) + '/public/index.html') # Include your public folder
  set :views, File.expand_path(File.dirname(__FILE__) + '/views/index.html')  # Include the views
  
  set :environment, :production

  disable :run, :reload

  require 'app_file' # replace this with your sinatra app file
  run Sinatra::Application

Step 2. Create a Capistrano deploy file.

This file should live at config/deploy.rb.

  set :domain, "yourdomain.com"
  set :application, "app_name"
  set :deploy_to, "/var/www/apps/#{domain}"

  set :user, "your_deploy_user"
  set :use_sudo, false

  set :scm, :git
  set :repository,  "git@github.com:you/application.git"
  set :branch, 'master'
  set :git_shallow_clone, 1

  role :web, domain
  role :app, domain
  role :db,  domain, :primary => true

  set :deploy_via, :remote_cache

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

    task :finalize_update, :except => { :no_release => true } do
      run "chmod -R g+w #{latest_release}" if fetch(:group_writable, true)

      # mkdir -p is making sure that the directories are there for some SCM's that don't save empty folders
      run <<-CMD
        rm -rf #{latest_release}/log &&
        mkdir -p #{latest_release}/public &&
        mkdir -p #{latest_release}/tmp &&
        ln -s #{shared_path}/log #{latest_release}/log
      CMD

      if fetch(:normalize_asset_timestamps, true)
        stamp = Time.now.utc.strftime("%Y%m%d%H%M.%S")
        asset_paths = %w(images css).map { |p| "#{latest_release}/public/#{p}" }.join(" ")
        run "find #{asset_paths} -exec touch -t #{stamp} {} ';'; true", :env => { "TZ" => "UTC" }
      end
    end
  end

Step 3: Deploy the app.

  cap deploy:setup
  cap deploy

Step 4: Get a beer, you're done!

Tagged: capistranosinatra