Docker
Base image
Quick answer
A base image is the image named in a Dockerfile's FROM instruction, providing the filesystem and tooling every subsequent layer builds on.
A base image is the image named in a Dockerfile's FROM instruction, providing the filesystem and tooling every subsequent layer builds on.
Why it matters
A base image update invalidates every layer beneath it, which is why a routine security bump can turn a 30-second incremental build into a full rebuild.
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Related
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.Container registryA container registry is a service that stores and distributes container images, such as GitHub Container Registry, Docker Hub or Amazon ECR.