Hi,
it is sufficient to set the Docker Directory path in LUCI (in my case /opt/docker/) to a new location and move the directories in /opt/docker/ to this new location to avoid running full on the boot disk ?
If not, what are steps to relocate the Docker Subsystem ?
This is for the docker files.
If some container is using a volume or mounts some directory, then you'll need to consider that too.
Don't forget to stop the docker service before you move the files!