Shell usage in dockerfile

2019-02-04 - How to use a proper shell in a dockerfile
Tag: docker

The problem

The default shell is [“/bin/sh”, “-c”], which doesn’t handle pipe fails when chaining commands.

The fix

To process errors when using pipes use this :

SHELL ["/bin/bash", "-eux", "-o", "pipefail", "-c"]

References

• https://bearstech.com/societe/blog/securiser-et-optimiser-notre-liste-des-bonnes-pratiques-liees-aux-dockerfiles/