I managed to configure Docker and docker-compose (first one installed from the official repository, and compose run as docker container). It works fine, and I have all my configs set on the attached exteral drive (remount with exec).
The problem is, that if I see this correctly, all the image pulls are stored on internal storage, which in my case is a 16 GB eMMC. Space run out fast.
What is the path of docker images on CoreElec and can that be changed somehow to the external drive?
Odroid N2 4GB, Coreelec latest, and 4TB external WD RED via USB 3.