Setting up private testnet with *several* nodes

[Kati]

Nobody knows?

[fav]

please use the appropriate subforum, I'm getting tired of hand-holding people here

[Kati]

I want to set up private  testnet with multiple nodes. In the documentation it describes how to do that only with a single node.

1) How about multiple ones, how to create them? I mean, exactly - I'm a newbie.

2) Also, how do nodes *discover* other nodes in the same network?

3) Say, there're 15 nodes.
 a) Does each node know about any other node?
 b) And What exactly makes them *belong* to the same network? They can be located in other countries and still belong to *same network*.


4) There's no central server or entity. To summarize -- does this mean that any *new node* can connect to *any existing/working node* in a network to become a part of that network?


p.s.

I'll use docker as I have only a single machine for testing, each node will be in its own docker.