Docker running script in entrypoint

Question

In Dockerfile I have defined an entrypoint:

ENTRYPOINT ["sh", "./docker-entrypoint.sh"]

In the docker-entrypoint.sh, I want to create a file (file.json) from the template.json, which is nothing but replaces some environment variables with actual values.

#! /bin/bash

eval "echo \"$(<template.json)\"" > file.json; npm start

Now, after getting in the container, I see file.json is empty. But if I execute the exact same command in the bash prompt inside the container, it works, and I see the required contents in file.json.

Why is this behaviour ?

Answer 1

The problem is with your interpreter: sh Try exec form: ENTRYPOINT ["/bin/bash", "-c", "./docker-entrypoint.sh"]

Answer 2

You use sh:

ENTRYPOINT ["sh", "./docker-entrypoint.sh"]

But in your entrypoint file you use bash:

#! /bin/bash

You have to choose