Goal

Document that configuring worker nodes on a separate subnet from the workers is supported and add details of how it's done.

Problem

Users are asking if they can run their workers on a network separate from the masters. This is common in Remote Worker Nodes (RWN) in telco and we have documentation for RWN, although it doesn't explain how to add workers to their own networks. This is also possible in other simpler scenarios where workers local to the masters are still placed on different subnets than the ones used for the masters. While it's supported and possible, customers are still unclear about its supportability in general.

Enhancement request

Update the RWN document to explain that:

• RWNs can be added with UPI as any other node
• RWNs can be added with IPI as per options below
• A route or default gw must be in place back to the control plane from every RWN

Update the IPI bare metal guide (4.6 through 4.10):

1. Add that to configure workers on their own networks it can be done as per the below two options.1. Use the node network configuration at install time (available from OCP 4.10)
2. Use a DHCP server with multiple subnets and allocate them to the workers as required

Notes

More details in the GDoc planning: https://docs.google.com/document/d/1thuNVmxl9Jt9hCM4LWkVhEhDpnq06N88IYKywZGATH8/edit#heading=h.c34jcvns3n7t