First Steps with Flask

A Quick Tutorial to Deploy a Flask Application with Docker

For a project I had the need to bootstrap a small web application.

Usually I run around the Spring-Boot camp, but this time I thought I try creating a web app with Flask.

As always, that service gets deployed in a Docker container.

First, the project directory gets created.

> mkdir flask-first-steps && flask-first-steps
> mkdir app

Then we create two files.

./app/main.py
./Dockerfile

The Dockerfile has to look like:

FROM tiangolo/uwsgi-nginx-flask:python3.8
COPY ./app /app

And contents of main.py are:

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

if __name__ == "__main__":
    # Only for debugging while developing
    app.run(host='0.0.0.0', debug=True, port=80)

Let’s build the image.

> docker build -t myflaskservice .
> docker run -d --name myflaskservice -p 8080:80 myflaskservice

Quick check to ensure its up and running curl 127.0.0.1:8080

Feel free to buy me a coffe if you liked this post.

Resources

• Flask Quickstart
• How To Build and Deploy a Flask Application Using Docker on Ubuntu 18.04