Dockerize a Flask App

How to Set Up the Project

Basic directory structure

This application has tree files, our application directory structure will look like this:

flask-docker
├── app.py
├── Dockerfile
├── requirements.txt

Create app.py

Let's add the following lines of code to our app.py:

from flask import Flask

app = Flask(__name__)

@app.route('/')

def hello_geek():

    return '<h1>Hello from Flask & Docker</h2>'

if __name__ == "__main__":

    app.run(debug=True)

Create Dockerfile

Let's add the following lines of code to our Dockerfile:

FROM  ubuntu

RUN apt update

RUN apt install python3 -y

RUN apt -y install python3-pip

WORKDIR src

COPY  .  .

RUN pip install -r requirements.txt --break-system-packages

EXPOSE 5000

CMD ["flask", "run", "--host", "0.0.0.0"]

Create requirements.txt

Let's add the following lines of code to our requirements.txt:

flask

How to Build a Docker Image

docker build -t <TAG-NAME> .

How to run an image as a container

docker run -d -p 5000:5000 <TAG-NAME>