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Hi,
I've replaced MySQL with Postgres. Postgres is much more robust in general than MySQL. Also with the Airflow project there are issues with the dropped packages.
Also some of the ports are not exposed anymore, for example of the worker as they are not used from the outside. This is not needed because there are no external processes connecting to these. Just linking the containers is sufficient. By only linking these containers, the number of worker nodes can also easily be scaled up using docker compose/swarm.
Cheers!