Stuck in a loop of freeing up space and filling it up again when rebuilding

Haha, well, I may have missed it or I may have seen it and scrolled past it because I had no reason to be interested in this kind of low level stuff. Database? It’s like the road when driving a car: you don’t really think about it until it gets bad.

It even took me a while to find what you (probably) where referring to now:

But on the way, I found this useful specification of what “not often” means:

To summary my lesson from this topic:

The confusion around the original issue was due to a combination of rather rare circumstances which meant that all standard instructions failed for various reasons:

  1. two-container setup
  2. need for (rare) database upgrade (which requires more disc space than other upgrades)
  3. only 20 GB SSD

Points 1 and 3 are still true but probably not nr. 2. Yet, I still had problems doing the web_only upgrade. So the db upgrade probably worsened things but it seems it was a mistake to run the two-container setup on 20GB.