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When using the default networking bridge mode, you must make a service on the Docker host listen (also) to docker0.

The provider container creates a Docker network that can be used by a consumer container.

Docker-compose makes it very easy to use the same Docker image for your Flask application and the Celery worker(s).

By sharing the code and (optionally) templates we avoid making copies and reduce maintenance time.

Use a script to check the directories and files that will be included in your Docker image fast and easy.

Docker bypasses ufw firewall settings and exposes ports to the outside world, a very serious security leak.

My Docker applications suddenly could not send mail using the host Postfix MTA. I fixed this by specifying a Docker default address pool, but it is better to do this before deployment.

When using a Python Alpine Docker image we must add the tzdata package before we can set the timezone.