What is a minimal viable number of hosts for an experimental Kubernetes cluster?

For example, to play with Docker Swarm in a way which makes sense you need 2 or better 3 hosts, right?

What is that number for K8S?

I'd say the minimal viable configuration to test and get a good overview of pod placement would be 5 machines, 2 masters and 3 nodes.

This allows you to play with a master failure, placement of multiple pods "stretched" across the cluster, etc.

StackExchange DevOps Q#2063, answer score: 10