Docker files for flask app

*Docker-Flask.md

Docker for flask app

1. Create a Dockerfile with all the specs for your image
2. Create a docker-compose.yml file for the basic setup
3. Create docker-compose.env.yml files for the specific rules for each environment

To build the image execute:
docker-compose -f docker-compose.yml -f docker-compose.env.yml build

To run the container execute:
docker-compose -f docker-compose.yml -f docker-compose.env.yml up

Or build and run together: docker-compose -f docker-compose.yml -f docker-compose.env.yml up --build

docker-compose.dev.yml

version: '3'
services:
  docker-flask:
    volumes:
      - ./app:/home/mich/service/app
    environment:
      - FLASK_ENV=development

docker-compose.prod.yml

version: '3'
services:
  docker-flask:
    environment:
      - FLASK_ENV=production

docker-compose.yml

version: '3'
services:
  docker-flask:
    # indication to use the local Dockerfile to build the image
    build: .
    container_name: "docker-flask" 
    # map docker port to local port
    ports:
     - "8000:5000"
    # setup environment variables to be used by the flask app
    environment:
      - FLASK_APP=app/main.py
      - PORT=5000
      - HOST=0.0.0.0

Dockerfile

FROM python:3.8-rc-alpine

# Use user mich instead of root
RUN adduser -D mich

# Copy project filesdoc
ADD . /home/mich/service
WORKDIR /home/mich/service

# Copy setup files like requirements, entrypoint, etc
ADD requirements.txt ./
ADD entrypoint.sh ./
# Add execution permission to entrypoint script
RUN chmod +x ./entrypoint.sh

# Install dependencies
RUN pip install -r requirements.txt

USER mich

EXPOSE 5000

# Execute the app
ENTRYPOINT [ "./entrypoint.sh" ]

entrypoint.sh

#!/bin/sh

# this script is used to run the Flash app using environment variables
flask run --port $PORT --host $HOST