Gemfile

source 'https://rubygems.org'

gem 'rails', '3.2.9'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

gem 'sqlite3'


# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'

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

  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

# 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
# gem 'debugger'

gem 'rake'
gem 'redis'
gem 'cf-runtime'

manifest.yml

---
applications:
  .:
    name: rails-worker
    framework:
      name: standalone
      info:
        mem: 64M
        description: Standalone Application
        exec: 
    runtime: ruby193
    command: PATH="/opt/cloudfoundry/runtimes/ruby-1.9.3-p125/bin:$PATH" bundle exec rake worker:run
    infra: aws
    url: 
    mem: 128M
    instances: 1
    services:
      standalone:
        type: redis

Rakefile

#!/usr/bin/env rake
# Add your own tasks in files placed in lib/tasks ending in .rake,
# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.

require File.expand_path('../config/application', __FILE__)

RailsWorker::Application.load_tasks

namespace :worker do

  task :run => :environment do
     loop do
       puts "#{Time.now} #{RUBY_VERSION}"
       puts "keys in redis:"
       puts $redis.keys.sort.join(', ')
       sleep 5
     end
  end
end

redis.rb

# config/initializers/redis.rb

require 'redis'
require 'cfruntime/redis'

def redisConnection
  redis_names = CFRuntime::CloudApp.service_names_of_type('redis')
  redis_options = {}
  unless redis_names.empty?
    redis_options = CFRuntime::RedisClient.options_for_svc(redis_names.first)
  end
  puts "Redis connection options:"
  puts redis_options
  Redis.new(redis_options)
end

$redis = redisConnection