Hi esackbauer,
thank you for your msg. Yes, of course, update to bookworm all sources, incl. the docker one.
My VM runs only plain debian bullseye with the mailcow (docker) daemons. Nothing more.
After this fiasko, i had make this try:
Run a copy of the original vm and reproduce it -> exact the same behavior.
After the upgrade to bookworm all the docker containers are there, but i get the error
Error response from daemon: error creating overlay mount to /var/lib/docker/overlay2/72d3b938c3096b74337a0c1edde2c8a95d044b501d5cc5ca27681030b30b7950/merged: invalid argument
when (re-)starting the daemons.
After that running the mailcow “update.sh” script which runs without errors, all the docker container are gone.
Very strange.
Bfo