To set up a Hub installation, you will require:
One central Uyuni Server, which acts as the Hub Server.
Two or more additional Uyuni Servers, registered to the Hub as Salt clients. This document refers to these as peripheral servers. Register peripheral servers to the Hub Server directly, do not use a proxy.
Any number of clients registered to the peripheral servers.
Ensure the Hub Server and all peripheral servers are running Uyuni 4.1 or higher.
The Hub Server must not have clients registered to it. Clients should only be registered to the peripheral servers.
You will need credentials to access the XMLRPC APIs on each server, including the Hub Server.