Dynamic Test/Evaluation Environment 

 Vagrant, Ganeti , Openstack are great tools for a dynamic data-driven test environment. couple them with a configuration management CFEngine3, Chef, puppet, , Ansible, or Saltstack and you will start having more time on your hand, and appreciating life around you. The possibilities are endless if you are looking for a backend highly available infrastructure Ganeti is your solution, used already by "Open Source Labs", Google, Mozilla, Greek Research and Technology Network, among others to manage cluster of virtual environments with resilience in mind. if you are looking for flexibility and providing your users with a private cloud solution Openstack will do. for testing new administration tools, policies, cookbooks, manifests, play books and blue prints than Vagrant is the way to go add the combination of these three together and you have dynamic solutions that scale in your own laptop or workstation from few virtual nodes to Amazon EC2, or your own company private cluster environment.