Installation

- Download and install the Libraries (7.x-2.x branch) module
  http://drupal.org/project/libraries

- Download Rackspace's Cloud Files PHP API binding
  (https://github.com/rackspace/php-cloudfiles/) and place it in
  sites/all/libraries/rackspace/ so that the path to cloudfiles.php is
  sites/all/libraries/rackspace/php-cloudfiles/cloudfiles.php

- Configure your setttings at /admin/config/media/cloud-files

- Visit admin/config/media/file-system and set the Default download method to
  Rackspace Cloud Files

- Add a field of type File or Image etc and set the Upload destination to
  Rackspace Cloud Files in the Field Settings tab.