Docker 在启动时运行 Python 文件

Question

First of all, I'm very new to Docker, so if my general idea of how this should work is stupid, then please tell me :) I created a Dockerfile which looks like this:

FROM nodered/node-red:1.2.1
COPY./retrieveNewFlow.py /home/retrieveNewFlow.py
ENTRYPOINT [ "/bin/bash" ]
CMD [ "python3", "/home/retrieveNewFlow.py" ]

I want to execute the retrieveNewFlow.py Python Script every time the container starts. But I get the following error message:

 /usr/bin/python3: /usr/bin/python3: cannot execute binary file

Can anybody image what i've done wrong?

Answer 1

Change the ENTRYSCRIPT in your dockerfile

from ENTRYPOINT [ "/bin/bash" ]

to ENTRYPOINT [ "/bin/bash", "-l", "-c" ]

Answer 2

The ENTRYPOINT and CMD are combined together into a single command , so the main container command becomes

/bin/bash python3 /home/retrieveNewFlow.py

This instructs Bash to try to run the Python interpreter as a shell script; since it's not, you get the error you see.

You are not required to have an ENTRYPOINT , and you should remove it here. Leave the CMD as you have it.

# No ENTRYPOINT
CMD ["python3", "/home/retrieveNewFlow.py"]

This will cause the main container command to be the Python script, without unnecessarily introducing a bash wrapper.