Docker
Image digest
Quick answer
An image digest is the content-addressed SHA-256 hash that uniquely identifies an exact container image.
An image digest is the content-addressed SHA-256 hash that uniquely identifies an exact container image.
Why it matters
Tags move; digests do not. Pinning by digest is the only way to guarantee that the image you tested is the image you deployed.
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Related
Base imageA base image is the image named in a Dockerfile's FROM instruction, providing the filesystem and tooling every subsequent layer builds on.BuildKitBuildKit is Docker's build engine, providing parallel layer execution, better caching and support for build secrets and multi-platform output.BuildxBuildx is the Docker CLI plugin that exposes BuildKit features, including multi-platform builds, remote builders and advanced cache backends.Cache mountA cache mount is a BuildKit feature that persists a directory across builds without including it in the resulting image layer.