Pattern: Use of ADD instead of COPY
Issue: -
Generally speaking, COPY is preferred because it’s more transparent. ADD has some features (like local-only tar extraction and remote URL support) that are not immediately obvious. Consequently, the best use for ADD is local tar file auto-extraction into the image, as in ADD rootfs.tar.xz /.
Example of incorrect code:
FROM python:3.4
ADD requirements.txt /usr/src/app/Example of correct code:
FROM python:3.4
COPY requirements.txt /usr/src/app/