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Dockerfile

Dockerfile example template

FROM <base_image>
WORKDIR <path_inside_container>
RUN <command_to_execute_during_build>
COPY <source> <destination>
EXPOSE <port>
CMD [ "<command>", "<arg1>", "<arg2>" ]
  • FROM — base image used to build your container
  • WORKDIR — directory where commands will run
  • RUN — commands executed during image build
  • COPY — copy files from host to container
  • EXPOSE — declare which port the container listens on
  • CMD — default command executed when the container starts

More examples

Dockerfile for mkdocs-material

FROM python:3.12.13-alpine3.22
WORKDIR /mkdocs
RUN pip install mkdocs-material
COPY matywaky-mkdocs/ .
EXPOSE 8000
CMD [ "mkdocs", "serve", "-a", "0.0.0.0:8000" ]

  • FROM
    Example: FROM python:3.12.13-alpine3.22
    Use Python 3.12 on Alpine Linux.

  • WORKDIR
    Example: WORKDIR /mkdocs
    All following commands run inside /mkdocs.

  • RUN
    Example: RUN pip install mkdocs-material
    Installs dependencies inside the image.

  • COPY
    Example: COPY matywaky-mkdocs/ .
    Copy the local folder into the working directory.

  • EXPOSE
    Example: EXPOSE 8000
    The application will run on port 8000.

  • CMD
    Example: CMD ["mkdocs", "serve", "-a", "0.0.0.0:8000"]
    Start MkDocs server and bind it to all interfaces.

Running python script

Example requirements.txt:

flask
psycopg2-binary
flask-cors

Example Dockerfile for running app.py script:

FROM python:3.12
WORKDIR /app
COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt
COPY . .
CMD [ "python", "./app.py" ]