You have an application that works well on a single node, and you’ve heard that Erlang lets you scale out in a cluster. How do you go about doing that?

We’ll walk through the steps I took to turn ExVenture (a multiplayer game server) into a distributed application.

Starting with connecting nodes in development and production, to picking a cluster leader via the Raft protocol, and dealing with process groups to fan calls throughout the cluster.

Finally we’ll see some of the hurdles I encountered when spanning multiple nodes.