What are the instructions for configuring "headless" linux servers to act as render nodes (potentially for a windows client) using blender 2.79b? Do they all have to be on the same network, or is some kind of firewall traversal provided?
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Honestly the best way to do this is to configure each cloud node to have a separate public IP, then you will need to ensure firewall and port forwarding rules allow traffic from the internet into your nodes on ports 9000 through 9025 (these are the default ports used, but are configurable if you want to change them so your nodes use other ports).
You then start each node, start the headless server (this assumes you have crowdrender/blender installed on each node). In your client you will need to add each node and then enter its IP address when you press connect. Pressing connect will give you a list of nodes and allow you to enter the IPs of each.
Hope this helps :)