This is an example of the current functionality of the Rackspace Cloud Server Version 2 API

servers.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'fog'

RACKSPACE_USERNAME = "racker"
RACKSPACE_API_KEY = "23423423"

#create connection
connection = Fog::Compute.new({
  :provider                 => 'Rackspace',
  :rackspace_username        => RACKSPACE_USERNAME,
  :rackspace_api_key    => RACKSPACE_API_KEY,
  :version => :v2
})


#list flavors
connection.flavors

#list images
connection.images

#create server
server = connection.servers.create(:name => 'fog-server', :flavor_id => 2, :image_id => "3afe97b2-26dc-49c5-a2cc-a2fc8d80c001")

#list servers
connection.servers

#delete server
server.destroy

#update
server.name = "bob"
server.save 

#list addresses
server.private_ip_address #returns IPv4 version
server.public_ip_address 
server.addresses #returns a hash of all addresses 

#change admin password
server.change_admin_password("BigBoy42 ")

#reboot
server.reboot

#resize
server.resize(3)

#once you confirm a resize you cannot revert and vice versa

#confirm resize
server.confirm_resize

#revert resize
server.revert_resize

#list attachements
connection.list_attachments(server.id)

#add attachments
connection.attach_volume(server.id, "0e7a706c-340d-48b3-802d-192850387f93", "/dev/xvdb") #I created the volume in the GUI; not sure where the device came from

#get attachement
connection.get_attachment(server.id, "0e7a706c-340d-48b3-802d-192850387f93")

#delete attachment
connection.delete_attachment(server.id, "0e7a706c-340d-48b3-802d-192850387f93")

#get specific image info
connection.images.get("992ba82c-083b-4eed-9c26-c54473686466")

#get specific flavor info
connection.flavors.get("2")