So, I pushed the single-server Kubernetes cluster that I was running my blog on a little too far, and it crashed into a bit of a heap. The pods running the different sites, including this blog, failed, and the underlying database got corrupted.
It has been down for a few weeks now. Initially I thought it was just a server issue and rebooted. When it didn't come up, I did little bits of investigation over the following weeks, just a few hours at a time, to figure out the issue.
I managed to work out how to restore the database and get it working, but the server was not stable. It would quickly crash, and trying to activate more than one site would just cause problems.
Kubernetes is quite complicated, and there is a lot of overhead for a single server. It was still a good exercise to understand the complexities of deploying Kubernetes on IPv6.
Now, deploying multiple services via containers is still a good approach, with Kubernetes simply a way to orchestrate, and manage, a large number of containers. So, I can pretty much just run the same containers, just directly (instead of inside Kubernetes).
As you can see, from this blog entry, my services are now back up and running.
There was still the complexity of running on IPv6 only, which I should probably write up in more detail, but for now a lot of it was based on an article by Stefan Kleeschulte, https://medium.com/@skleeschulte/how-to-enable-ipv6-for-docker-containers-on-ubuntu-18-04-c68394a219a2