how to correctly copy requirements.txt for docker file-CodePudding

This is how my current folder structure looks like:

I am present in the FinTechExplained_Python_Docker folder. My Dockerfile looks like this:

FROM python:3.8-slim-buster

WORKDIR /src

COPY requirements.txt requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD [ "python", "main.py"]

However, when I run this command docker build --tag FinTechExplained_Python_Docker .

I get this error

ERROR [3/5] COPY requirements.txt requirements.txt                    0.0s
------
 > [3/5] COPY requirements.txt requirements.txt:
------
failed to compute cache key: "/requirements.txt" not found: not found

What am I doing wrong?

Edit:

I also tried changing it to:

COPY str/requirements.txt requirements.txt:

but then I would still get the error that:

failed to compute cache key: "/src/requirements.txt" not found: not found

maybe the second COPY statement is also to be changed but not sure how

CodePudding user response：

When building image from Dockerfile it searches file from directory where Dockerfile is located (FinTechExplained_Python_Docker in your case).

So basically requirements located at FinTechExplained_Python_Docker/src/requirements.txt, but docker searches them at FinTechExplained_Python_Docker/requirements.txt.

To fix this you have to change 5th line to:

COPY src/requirements.txt requirements.txt

CodePudding user response：

You need to specify the source of your COPY statements relative to the build context, like this

FROM python:3.8-slim-buster

WORKDIR /src

COPY src/requirements.txt requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

COPY src/ .

CMD [ "python", "main.py"]