Hi there.. Posting for awareness.
Original question: I it possible to change/replace an initial node?
Answer from @jussi
when you remove (terminate the instance and then '
kontena node rm ...') an existing initial node and then create a new one, the new node will take the place of the previous initial node. In this way you can replace initial nodes. Remember that don't take all the initial nodes down at once to replace them, you'll lose the state. Initial nodes control the etcd data "cluster" (based on Raft protocol) and thus you should do the replacement so that you have majority present and healthy at all times.
Thank you for an excellent answer