DockerFlaskApp

Objective

This repository shows how to launch an API with Docker and Flask in Python.:

Summary

This repository contains all the necessary code to launch a Flask app in a Docker.

Dockerfile

FROM python:3.6-slim
MAINTAINER Dimitri Bettebghor

RUN apt-get update && apt-get install -qq -y \
  build-essential libpq-dev --no-install-recommends

ENV INSTALL_PATH /webapp
RUN mkdir -p $INSTALL_PATH

WORKDIR $INSTALL_PATH

COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt

COPY . .

CMD gunicorn -b 0.0.0.0:3333 --access-logfile - "webapp.app:app"

Description :

• FROM indicates which Docker image is to be used
• MAINTAINER gives the name of the author of the Docker image
• RUN launches packages installation
• ENV sets environment variable
• RUN mkdir creates a repository
• WORKDIR sets the working directory
• COPY copies the requirements file where Python modules are listed
• RUN pip installs the Python modules listed in requirements.txt

For more documentation on these commands and on all available Dockerfile commands see online documentation

docker-compose.yml

version: '3'

services:
  webapp:
    build: .
    command: >
      gunicorn -b 0.0.0.0:3333
      --access-logfile -
      --reload
      "webapp.app:app"
    environment:
      PYTHONUNBUFFERED: 'true'
    volumes:
      - '.:/webapp'
    ports:
      - '3333:3333'

docker-compose.yml file. Documentation on docker-compose file can be found here

Running the container

Now in a terminal, run

docker-compose up --build

You should see all the steps, and if everything works you can now open a browser and type in the URL

localhost:3333/users/Toto

and you should see