Docker 运行 Python 错误 - [错误 2] 没有这样的文件或目录

Question

I am new to docker, I have prepared a dockerfile and built a basic docker image, however, I got this error when I run it. My dockerfile is below:

FROM python:3.8.6
MAINTAINER tester  tester
ADD . /code
WORKDIR /code
CMD ["python", "/app/Main.py"]

I used this command to build my docker image (I am in folder "test" to execute this command):

docker build -t my_test .

And then I use this command tp run my docker image:

docker run -it my_test

Then I have got this following error:

python: can't open file '/app/Main.py': [Errno 2] No such file or directory

I can confirm the folder "app" has got script "Main.py". What is the possible reason?

Thanks,

Answer 1

You're using a hard coded file path in the CMD which is ignoring your working directory, remove the prefixing slash

CMD ["python", "app/Main.py"]

Answer 2

When you start a path with a / it corresponds to the root level. Change the following line as follows:

CMD ["python", "/app/Main.py"]

to:

CMD ["python", "app/Main.py"]

OR

CMD ["python", "./app/Main.py"]