docker: how to show the diffs between 2 images

Question

I have a Dockerfile with a sequence of RUN instructions that execute \"apt-get install\"s; for example, a couple of lines:

RUN apt-get install -y tree
RUN apt-ge         


        

Answer 1

I suppose you could send both images' file systems to tarballs via docker export CONTAINER_ID or docker save IMAGE_ID (updated based on comments)

Then use whatever tool you like to diff the file systems - Git, Rdiff, etc.