This is code entire code sample presented in the Ruby SDK training on 9/19/2013

container-example.rb

# require the Fog library
require 'fog'

# Create a service object to access Cloud Files
service = Fog::Storage.new :provider => 'rackspace',
  :rackspace_username => USER, # replace USER with your username
  :rackspace_api_key => API_KEY, # replace API_KEY with your key
  :rackspace_region => :ord # We are using the Chicago data center, by default Fog will use the Dallas data center

# Create a container - Note that Fog refers to containers as directories
dir = service.directories.create :key => 'sdk-demo'

puts "Container #{dir.key} has been created\n"

# upload sam.jpg and store it into the sdk-demo directory with the name dog.jpg
obj = dir.files.create :key => 'dog.jpg', :body => File.open('sam.jpg', "r")

puts "Object #{obj.key} has been uploaded to container #{dir.key}\n"

# Enable CDN
dir.public = true
dir.save

puts "Container #{dir.key} is now CDN enabled\n"

# retrieve the CDN url for the dog.jpg object
obj.public_url

puts "#{obj.key} is available at #{obj.public_url}\n"

# Download dog.jpg stored in the sdk-demo directory and store it in a file called sam.jpg
File.open('sam.jpg', 'w') do | f |
  dir.files.get(obj.key) do | data |
    f.write data
  end
end

puts "#{obj.key} has been downloaded to sam.jpg\n"

# delete the dog.jpg object
obj.destroy

puts "#{obj.key} has been deleted!\n"

# delete the sdk-demo container
dir.destroy

puts "#{dir.key} has been deleted!"