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Pinning the Image Build Recipe: Base Image, System Packages, and Layer Order

Digest pinning preserves an image you already have; this node is what makes the image worth preserving in the first place, and it is the only defence when the image must be rebuilt. The outcome explicitly asks that a result be re-derivable from the recorded environment, which requires the recipe and the artefact to agree.

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Building a Custom Docker Image from a Dockerfile and Running It as a Container

A container image is an immutable, self-contained package of application code together with its runtime, libraries, system tools, and configuration, and a container is the running instance of such an…