Not all of us have unlimited budgets for infinite nodes, and even if you do, it's important to spend wisely. If you're running Rancher in a non-production environment and want to start with a single node now and upgrade to an HA configuration later, you can do this with RKE. Once a cluster is up and running, make the best use of your available storage by deploying block-level replication with OpenEBS within your Kubernetes clusters.