I use porkbun.com for my domains, which is excellent, and also has glue record support.
https://kb.porkbun.com/article/112-how-to-host-your-own-nameservers-with-glue-records
The thing you want is "glue records" the upper level server would serve ns1.example.com (this is an approved domain for example use, better to use example.com than making your own example up) as the authoritative name server. Then provide the glue record which says "ns1.example.com is at IP address X".
It should ask for IP addresses as well as hostname. Otherwise they only assumed people will "host" their domain in another hosted, as opposed to self-hosting.
In that case (and in any other case) change your registrar to someone else who supports glue records.
Don't forget smallpox! (Polio still has pockets where it lives, but no longer a threat to general world population)
Lots of people contributed really good answers, so I don't have anything valuable to add to their answers. But I wanted to point out for your detailed question, you include what you have done, what is your understanding and what are your shortcomings clearly. As opposed to a lot of posts with vague, detail-challenged narratives, that's a top notch post.
And the community delivered by giving good answers, so go community!
Also, you didn't just ghost after the initial post and interacted.with the people who graciously donated their time, so another bonus point there, as well.
That's fine, it says "pie" anyway...
Same here.
https://longhorn.io/ for the curious
CRISPR to the rescue!
+1 on not using containers.for Network routing stuff That way lies pain and misery.
A good answer to a "why?" question is "why not?" This can be a great learning or practice opportunity for redundant network links and other interface challenges.
No need for using sensational/clickbait headlines like this.
BBC has just started doing that at https://social.bbc
What is FUTO?
FUTO is an organization dedicated to developing, both through in-house engineering and investment, technologies that frustrate centralization and industry consolidation.
https://futo.org/