Why do I need a shell script to run a python script inside the container?

Question

Why does the first Dockerfile does not work? Meaning that it reports docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "exec: \"python3 hello.py\": executable file not found in $PATH": unknown. ERRO[0001] error waiting for container: context canceled, where as the second Dockerfile works like a charm?

In other words, why do I need a shell script to run a python script inside the container?

Dockerfile 1:

FROM python:3.7-alpine
COPY hello.py .
ENTRYPOINT [ "python hello.py" ]

Dockerfile 2:

FROM python:3.7-alpine
COPY hello.py .
COPY entrypoint.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/entrypoint.sh
ENTRYPOINT [ "entrypoint.sh" ]

Siyu · Accepted Answer · 2018-11-23 14:16:34Z

0

ENTRYPOINT syntax requires either

ENTRYPOINT [ "python", "hello.py" ] exec form, recommended
ENTRYPOINT python hello.py shell form

edited Nov 23, 2018 at 14:16

answered Nov 23, 2018 at 14:14

Siyu

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