Reminder: Tricks to setup docker container for FastAPI/Python application

This is a reminder for myself, in case I forgot… which already happened several times….

FROM --platform=linux/amd64 python:3.9.15

WORKDIR /app

ADD . /app

RUN pip install -r requirements.txt

CMD ["gunicorn", "-w", "4", "-k", "uvicorn.workers.UvicornWorker", "-b", "0.0.0.0:80", "app.main:app"]

This is a Dockerfile example for running FastAPI application. Python version is 3.9.15 which needs to match your python version that set in your pyproject.toml.

Otherwise, you may see the following error…

docker: Error response from daemon: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: "gunicorn": executable file not found in $PATH: unknown.
ERRO[0000] error waiting for container:  

While doing port mapping, not matter in docker-compose file or running with command docker run --name my_container -p 5566:80 my_image

The first port number is the port number for your machine.

The second port number is the port number for your container.