Question 84709 in Docker Question posted in
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Dockerfile specifying path of API

I’m using docker for the first time. I have a web application in angular and a backend application in python/flask. After some struggle, I finally managed to get everything to work, but docker can’t find my API program in my backend:

My server file is at /my_backend/src/server.py
My docker file is at /my_backend/Dockerfile.dockerfile

Content of Dockerfile.dockerfile:

FROM python:3.7-slim
COPY /src .
WORKDIR /src/app
ENV PYTHONUNBUFFERED 1
COPY requirements.txt /tmp/requirements.txt
RUN python3 -m pip install -r /tmp/requirements.txt
CMD ["python","server.py"]

The error message in the command prompt is

Attaching to backend, frontend
backend   | python: can't open file 'server.py': [Errno 2] No such file or directory
backend exited with code 2

Feel free to ask for more information.
I used this tutorial: https://medium.com/analytics-vidhya/dockerizing-angular-application-and-python-backend-bottle-flask-framework-21dcbf8715e5

Tags:

2

Answers


  1. 0

    If your script is in /src directory, don’t use WORKDIR /src/app but WORKDIR /src or CMD ["python","../server.py"]

    Solution 1:

    FROM python:3.7-slim
COPY /src .
WORKDIR /src    # <- HERE
ENV PYTHONUNBUFFERED 1
COPY requirements.txt /tmp/requirements.txt
RUN python3 -m pip install -r /tmp/requirements.txt
CMD ["python","server.py"]

    Solution 2:

    FROM python:3.7-slim
COPY /src .
WORKDIR /src/app
ENV PYTHONUNBUFFERED 1
COPY requirements.txt /tmp/requirements.txt
RUN python3 -m pip install -r /tmp/requirements.txt
CMD ["python","../server.py"]     # <- HERE, or "/src/server.py"

    Suggested by @TheFool:

    FROM python:3.7-slim
WORKDIR /src/app  # Swap WORKDIR and COPY
COPY /src .
ENV PYTHONUNBUFFERED 1
COPY requirements.txt /tmp/requirements.txt
RUN python3 -m pip install -r /tmp/requirements.txt
CMD ["python","server.py"]
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  2. 0

    turn your workdir and copy instructions around to make it work.

    FROM python:3.7-slim
WORKDIR /src/app # workdir first
COPY /src .
ENV PYTHONUNBUFFERED 1
COPY requirements.txt /tmp/requirements.txt
RUN python3 -m pip install -r /tmp/requirements.txt
CMD ["python","server.py"]
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