You need to add :Z to the end of your volume lines, or lowercase z for shared volumes.

I’m running 50+ containers, probably most of the popular ones, and all working fine.

I run 50+ containers with rootless Podman compose (on CoreOS) and haven’t encountered any unsolvable issues so far.

I’ve never tried quadlets but haven’t found a need or any driving reason to do so.

Move your stuff from Gandi to Netim.com

Gandi got acquired and has done some very weird shit with pricing.