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I’m a Chicago software engineer who loves to move fast and fix things… Usually.


Compare installed packages between 2 docker images.

Why? An, eventually abandoned, attempt to transition from node: x,x,x to node: x,x,x-slim. I needed to determine which packages were excluded in the node - slim image. Given any two images, I use this script to compare the installed packages. This works with debian based images. IMAGE_ONE=node:lts IMAGE_TWO=node:lts-slim comm -23 <(sort <(docker run $IMAGE_ONE apt list --installed)) <(sort <(docker run $IMAGE_TWO apt list --installed)) This will list out the packages present in “Image_One” and not “Image_Two”. Read more...