This is a working example of a multi-container flask application with Postgres as the database fronted by the nginx reverse proxy. See my blog post for a detailed explanation.

1. Bootstrap the DB

$ docker-compose up -d db
$ docker-compose run --rm flaskapp /bin/bash -c "cd /opt/services/flaskapp/src && python -c  'import database; database.init_db()'"

2. Bring up the cluster

$ docker-compose up -d

3. Browse to localhost:8080 to see the app in action.