If you have a Flask app that you would like packaged in a Docker container, then you can do the following. The steps outlined below will help you create the following directory tree:
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└── flaskapp
├── Dockerfile
├── app.py
└── requirements.txt
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Step 1 – Create your Flask app
In a new directory, create the following files:
app.py
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from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_geek():
return '<h1>Hello world!</h2>'
if __name__ == "__main__":
app.run(debug=True)
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requirements.txt
Step 2 – Create your Docker file
In the same directory, create a Dockerfile:
Dockerfile
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FROM python:3.8-slim-buster
WORKDIR /python-docker
COPY requirements.txt requirements.txt
RUN pip3 install -r requirements.txt
COPY . .
CMD [ "python3", "-m" , "flask", "run", "--host=0.0.0.0"]
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If you want to pass environment variables to your running docker container, then potentially use the following instead:
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FROM python:3.8-slim-buster
WORKDIR /python-docker
COPY requirements.txt requirements.txt
RUN pip3 install -r requirements.txt
COPY . .
ENTRYPOINT ["python3"]
CMD ["app.py"]
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Step 3 – Build your Docker image
Build your Docker image:
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docker build -t ourflaskapp:latest .
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Step 4 – Run your Docker container
Run your new Docker container:
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sudo docker run -p 5000:5000 ourflaskapp
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