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Dive is great. Tools like that are critical for both learning and developing confidence on what you are precisely building/shipping.
Dredge is another tool to look at. I use it for diffing layers.
https://github.com/mthalman/dredge/blob/main/docs/commands/i...
Eventually, once zstd support gets fully supported, and tiny gzip compression windows are not a limitation, then compressing a full layer would almost certainly have a better ratio over several smaller layers
https://github.com/opencontainers/image-spec/issues/803
Dive is an amazing tool in the container/Docker space. It makes life so much easier to debug what is actually in your container. When we were first getting started with Depot [0], we often got asked how to reduce image size as well as make builds faster. So we wrote up a quick blog post that shows how to use Dive to help with that problem [1]. It might be a bit dated now, but in case it helps a future person.
Dive also inspired us to make it easier to surface what is actually in your build context, on every build. So we shipped that as a feature in Depot a few weeks back.
[0] https://depot.dev