#-------- start 3 nodes a, b, c

iex --name a@127.0.0.1 -S mix
iex --name b@127.0.0.1 -S mix
iex --name c@127.0.0.1 -S mix


#-------- on node a:

cluster_name = :cluster
system_name = :system

machine = {:simple,
  fn command, _state -> command
  end,
0}

nodes = [node_a, node_b, node_c] = [:"a@127.0.0.1", :"b@127.0.0.1", :"c@127.0.0.1"]
server_ids = [server_id_a, server_id_b, server_id_c] = for node <- nodes, do: {cluster_name, node}

for node <- nodes, do: true = Node.connect(node)
for node <- nodes, do: :rpc.call(node, :ra, :start, [])

:ra.start_cluster(:default, cluster_name, machine, [server_id_b])

:ra.start_server(:default, cluster_name, server_id_a, machine, [server_id_b])
:ra.add_member(server_id_b, server_id_a)

:ra.start_server(:default, cluster_name, server_id_c, machine, [server_id_b])
:ra.add_member(server_id_b, server_id_c)


#-------- manually shutdown all followers (a and c)

#-------- start a new node d

iex --name d@127.0.0.1 -S mix

cluster_name = :cluster
system_name = :system

machine = {:simple,
  fn command, _state -> command
  end,
0}

nodes = [node_a, node_b, node_c] = [:"a@127.0.0.1", :"b@127.0.0.1", :"c@127.0.0.1"]
server_ids = [server_id_a, server_id_b, server_id_c] = for node <- nodes, do: {cluster_name, node}

server_id_d = {cluster_name, :"d@127.0.0.1"}

:ra.start()
:ra.start_server(:default, cluster_name, server_id_d, machine, [server_id_b])
:ra.add_member(server_id_b, server_id_d)

#>>>>>>> added (not expected as no majority is reached)


#-------- start a new node e

iex --name e@127.0.0.1 -S mix

cluster_name = :cluster
system_name = :system

machine = {:simple,
  fn command, _state -> command
  end,
0}

nodes = [node_a, node_b, node_c] = [:"a@127.0.0.1", :"b@127.0.0.1", :"c@127.0.0.1"]
server_ids = [server_id_a, server_id_b, server_id_c] = for node <- nodes, do: {cluster_name, node}

server_id_e = {cluster_name, :"e@127.0.0.1"}

:ra.start()
:ra.start_server(:default, cluster_name, server_id_e, machine, [server_id_b])
:ra.add_member(server_id_b, server_id_e)

#>>>>>>> not added {:error, :cluster_change_not_permitted} (expected)