Fast Docker, Python, Flask deployment on Linux | Raspberry Pi Example

Instructions for your copying and pasting pleasure:
1. Install Docker on Ubuntu
sudo apt update
sudo apt install docker.io
sudo systemctl start docker
sudo systemctl enable docker
docker --version # Verify installation
You will need to add your user to the Docker group, add the user with the command below and restart the shell session.
sudo usermod -aG docker insert-your-username-here
2. Create a Basic Flask App
Create a new directory and navigate into it:
mkdir flask_app && cd flask_app
Create app.py:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
return 'Hello, World!'
if _name_ == '__main__':
app.run(host='0.0.0.0', port=5000)
Create requirements.txt:
Flask
3. Dockerize the Flask App
Create a Dockerfile:
FROM python:3.8-slim
WORKDIR /app
COPY requirements.txt /app/
RUN pip install -r requirements.txt
COPY . /app
EXPOSE 5000
CMD ["python", "app.py"]
Build the Docker image:
docker build -t myflaskapp .
Run the container:
docker run -d -p 5000:5000 --restart=always myflaskapp