If you want to understand a Docker image, there is no more useful tool than the docker history command. Whether it’s telling you why your image is so large, or helping you understand how a base image was constructed, the history command will let you peer into the innards of any image, allowing you to see the good, the bad, and the ugly.
Let’s see what this command does, what it can teach us about the construction of Docker images, and some examples of why it’s so useful.
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