Hi, you are correct. I am using the official owncloud/server container. But further troubleshooting indeed shows the issue lies somewhere else: my docker container for owncloud on nas seems unable to connect to docker database containers on same nas…
I did not expect that. Stupid me. Mysql connection to a container on a different cluster does work.
Thanks for pushing me back on track and apologies for the inconvenience.
Edit: Now works. I needed to define another network to be able to share the connection.