Docker project: Python/Flask application container

We’re going to containerize a small Python web service that uses the Flask web framework. This is an extremely common pattern, and Python lends itself well to containerization because packaging and dependency management are famously messy in a lot of Python projects. You’ll create all the files yourself – try to use a command-line text editor for practice!

1. Set up the application

First, create a new directory and enter it:

mkdir dockerpy && cd dockerpy

Create the tiny Python web application. I’m using vim in this example, but use whichever editor you like:

vim echo_server.py

Paste the following text inside:

from flask import Flask, request
import os
app = Flask(__name__)
@app.route('/')
def echo():
    return {
        "method": request.method,
        "headers": dict(request.headers),
        "args": request.args
    }
@app...