I tried this yesterday and my initial impression is that this is a streamlined solution and I want to dig in deeper. One thing though, it is unclear how much RAM Rancher 2.0 requires. http://rancher.com/rancher2-0/ states 2 GB, while the Getting Started Guide at http://rancher.com/docs/rancher/v2.0/en/quick-start-guide/ says minimum of 4 GB RAM.
The correct answer is 4GB.