README.md

Start flask server:

# start app on default port 5000
python app.py

# start app on port 5555
export FLASK_APP=main.py
export FLASK_RUN_PORT=5555
flask run

Containerized app:

docker build -t dejanualex/python_hello:1.0 .
# port baked into image
docker run --rm -p 5555:5555 dejanualex/python_hello:1.0

docker build -t dejanualex/python_hello:1.1 .
# port as env var
docker run --rm -e FLASK_RUN_PORT=5554 -p 5554:5554 dejanualex/python_hello:1.1

# build with args for port
docker build --build-arg PORT=5553 -t dejanualex/python_hello:1.2 .
docker run --rm -p 5553:5553 dejanualex/python_hello:1.2

# cleanup
docker rmi dejanualex/python_hello:1.0 dejanualex/python_hello:1.1 dejanualex/python_hello:1.2