Assumed audience: You need a domain managed in Cloudflare dashboard for any of this to work. I assume you do, and want to point to your Unraid NAS, with SWAG as the reverse proxy. So this is a niche topic. I used the old cloudflare/cloudflared Docker container configuration with a local YAML file via aeleos’s Unraid plugin. It was a very simple file, being just:
This tip is a bit out of context, but will make sense once I write more about the NAS I did set up. The NAS I have runs Unraid. It’s a Slackware-based Linux operating system that provides a bit of redundancy/recovery from drive failures without the RAID setup overhead and performance penalties. More details will follow later.
Update 2021-02-16: I accidentally solved the problem myself, with help by Docker specialist @cwrau using a IPv6 NAT container I need help with a NAS (running the Unraid operating system) and Docker containers (Docker v19.03.5 at the moment) for various services.