I've been running an Elixir app in production on about 20 nodes for 18 months. We just build Debian packages and deploy using Salt.
Additionally, most of the cluster nodes run on Spot Instances in AWS so they are relatively inexpensive also. When a new instance comes up it connects to the cluster and starts serving requests. When an instance is killed, traffic is routed to the remaining nodes. Works great.
Additionally, most of the cluster nodes run on Spot Instances in AWS so they are relatively inexpensive also. When a new instance comes up it connects to the cluster and starts serving requests. When an instance is killed, traffic is routed to the remaining nodes. Works great.