ex_cluster.ex

  # ...  
  # No longer take in NODES from env
  # case System.get_env("NODES") do
  #   nodes when is_binary(nodes) ->
  #     nodes
  #     |> String.split(",")
  #     |> Enum.map(&String.to_atom/1)
  #     |> Enum.each(&Node.connect/1)
  #   _ ->
  #     nil
  # end
  
  # env based LibCluster topologies
  topologies = Application.get_env(:libcluster, :topologies)
    
  children = [
    # add a Cluster Supervisor using configurable topology
    { Cluster.Supervisor, [topologies, [name: ExCluster.ClusterSupervisor]] },
    { ExCluster.StateHandoff, [] },
  # ...