Auto-scale Rackspace Cloud servers with Fabric and Celery

Copyright 2012 Nicholas Kuechler http://www.nicholaskuechler.com/

• You must edit auto-scale.py, fabfile.py, tasks.py, and conf/settings.py to fit your project
• conf/settings.py
  • Set your Rackspace Cloud API details
    • CLOUDSERVERS_USERNAME, CLOUDSERVERS_API_KEY
  • Set CLOUDSERVERS_IMAGE_TEMPLATE to the name of your Cloud Servers saved image backup snapshot
• auto-scale.py
  • Set your rabbitmq vhost details in: get_rabbitmq_queue_size()
    • Currently: project_vhost
  • Set the path to fabric and your fabfile.py in: start_workers_with_fabric()
    • Currently: /opt/codebase/auto-scale/fabfile.py
• fabfile.py
  • Set your new worker naming convention in: _create_server()
    • Currently: server_name = 'worker-%s' % (get_uuid)
  • Set path to your codebase that will rsync to new worker in: _rsync_codebase_to_worker()
    • Currently: /opt/codebase/ in the call() to rsync
  • The deploy_worker() does most of the work

• Use conf/settings.py to define additional settings:
  • Code base path
  • Snapshot image template name
  • Paths to Fabric and fabfile.py in auto-scale.py
  • RabbitMQ vhost name

Read my blog post on this project:

http://nicholaskuechler.com/2012/06/19/auto-scale-rackspace-cloud-servers-with-fabric-and-celery/