Check out a new way of deploying Cassandra docker cluster on AWS. We use FireCamp platform to get this done in a quick manner. There is even an AWS Quickstart just launched to allow one-click deployment of Cassandra services.
Containerization is “boiling” the cloud systems evolution, and the “fire” is reaching stateful services. Firecamp, the open source solution, is the most easy to use and cost saving approach that allows AWS users to achieve this with your full control.