* setup & run
python manage.py makemigrations

$ cd docker_launcher
$ docker-compose build .
$ docker-compose up db
wait db show "accept connnection"

$ docker-compose up web

Below only need for the first launch:

$ docker ps
find "web" container: say 'idxxx'

$ docker exec -ti 'idxxx' /bin/bash
execute the migrate commands
$ python manage.py makemigrations xxx
$ python manage.py migrate

* map database folder to host

$ docker rm <db_container>
then
$ docker-compose up db