How to fix docker: exec format error

[joseletk]

For example, you want to execute the following shell script.

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# /usr/local/bin/run.sh

echo "hello, world"
Dockerfile

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ADD run.sh /usr/local/bin/run.sh
RUN chmod +x /usr/local/bin/run.sh
CMD ["/usr/local/bin/run.sh"]

When you run the container, your expectation is the container prints out hello, world. However, what you will get is a error message:

$ docker run -i hello_world_image

You see this message when you didn’t put shebang in your script, and because of that, default entry point /bin/sh -c does not know how to run the script.


To fix this, you can either add shebang

/usr/local/bin/run.sh

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#!/bin/bash
echo "hello, world"
or you can specify from command line.

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$ docker run -entrypoint="/bin/bash" -i hello_world_image==========================================================================