It should be quite similar using AWS insted of rackspace

production.rb

  # Enable serving of images, stylesheets, and JavaScripts from an asset server
  config.action_controller.asset_host = "https://c776950.ssl.cf2.rackcdn.com"

upload.rake

require 'cloudfiles'
cf = CloudFiles::Connection.new(
  :username => Cloudsdale.config['rackspace_cloudfiles']['username'],
  :api_key => Cloudsdale.config['rackspace_cloudfiles']['api_key'],
  :snet => false
)

namespace :assets do

  desc "Upload assets to rackspace"
  task :upload do

    # Set up CloudFiles and paths
    container = cf.container('cloudsdale_production_assets')
    shared_path = Pathname.new(ENV["SHARED_PATH"])
    assets_path = shared_path.join("assets")
    remote_files = container.objects
    local_files = Dir.glob(assets_path.join('**', '*.*')).collect{ |file| file.slice!(shared_path.to_s + '/'); file }

    if remote_files.sort == local_files.sort
      puts "Remote and local the same. Skipping..."
    else
      puts "Starting remote sync..."
      # See if there are files existing localy but not remotely
      (local_files - remote_files).each do |file|
        object = container.create_object(file, false)
        object.load_from_filename(shared_path.join(file))
        puts "Uploaded #{file}"
      end

      # See if there is any files that exists remotely but are removed localy
      (remote_files - local_files).each do |file|
        container.delete_object(file)
        puts "Removed #{file}"
      end
    end

  end

end