A Dockerfile is a text document that contains all the commands an administrator could call on the command line to assemble an image. It is used to create a Docker image, which can then be used to create Docker containers.

Example:

FROM ubuntu:18.04

RUN apt-get update && apt-get install -y
python3-pip
python3-dev

COPY . /app

WORKDIR /app

RUN pip3 install -r requirements.txt

ENTRYPOINT [“python3”]

CMD [“app.py”]

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