This video shows how easy it is to deploy Ruby or PHP applications to a Hybrid Cloud using the Engine Yard Platform as a Service and a Cloudstack-based infrastructure. In fact, you can do so with little to no configuration.
The Engine Yard Cloud is the best Platform as a Service (PaaS) for a wide range of applications, from small-scale web applications that run within a single compute instance, to large-scale enterprise applications that require the reliability, elasticity and performance of high-availability clusters.