standard_init_linux.go:211: exec user process caused "exec format error"

This can also happen when your host machine has a different architecture from your guest container image.

E.g. running an arm container on a host with x86-64 architecture

I can see that you add the command command: [/app/helloworld.py] to yaml file.

so you need to (in Dockerfile):

RUN chmod +x /app/helloworld.py

set shebang to your py file:

#!/usr/bin/env python # whatever your defualt python to run the script

or setup the command the same as you did in Dockerfile

I recently encountered the problem when running a logstash container

standard_init_linux.go:211: exec user process caused "exec format error"

Noticed that the shebang line (#!/bin/sh) on the entrypoint.sh was typed in the second line instead of the first line of the entrypoint.sh file.

When the shebang line is made as to the first line in the script, the error went away and "docker run -it logstashimage:latest sh" worked perfectly.