Docker container build faild: "exec: \"flask\": executable file not found in $PATH": unknown

Question

I'm learning docker. I try run a sample dockerfile on docker,com. But I have a problem is "Error response from daemon: OCI runtime create failed: container_linux.go:345: starting container process caused "exec: \"flask\": executable file not found in $PATH": unknown ".

FROM python:3.7-alpine

WORKDIR /code
ENV FLASK_APP app.py
ENV FLASK_RUN_HOST 0.0.0.0
RUN apk add --no-cache gcc musl-dev linux-headers
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
COPY . .
CMD ["flask","run"]

Many thanks.

Answer 1

Seems like flask is not found from the PATH. It is either not installed (is it in requirements.txt?), or just not added into path.

You could try to set CMD ["python", "-m", "flask", "run"] instead.

Edit: Example here works for me well. https://docs.docker.com/compose/gettingstarted/

You could try to pass --no-cache option to just in case make clean image: docker build --no-cache -t test . and then run docker run test

When attempting to test image, before going into docker-compose state.