Simple Flask and Redis app using Docker Compose

This is a simple Flask app that keeps track of how many times you visit the website url.

Dockerfile

FROM python:3.4-alpine

ADD . /code

WORKDIR /code

RUN pip install -r requirements.txt

CMD ["python", "app.py"]

This tells Docker to:

• Build an image starting with the Python 3.4 image.

• Add the current directory . into the path /code in the image.

• Set the working directory to /code.

• Install the Python dependencies.

• Set the default command for the container to `python app.py.

Compose file

version: '3'
services:
  web:
    build: .
    ports:
     - "5000:5000"
    volumes:
     - .:/code
  redis:
    image: "redis:alpine"

This Compose file defines two services, web and redis. The web service:

• Uses an image that’s built from the Dockerfile in the current directory.

• Forwards the exposed port 5000 on the container to port 5000 on the host machine. We use the default port for the Flask web server, 5000.

• The volumes key mounts the project directory (current directory) on the host to /code inside the container, allowing you to modify the code on the fly, without having to rebuild the image.

Build and run

To run the containers write:

docker-compose up

And then visit http://localhost:5000

Stop Docker

To stop a running service simply type CTRL + C

Afterward, to bring everything down and remove unused containers type:

docker-compose down --volumes