Docker
Cache mount
Quick answer
A cache mount is a BuildKit feature that persists a directory across builds without including it in the resulting image layer.
A cache mount is a BuildKit feature that persists a directory across builds without including it in the resulting image layer.
Why it matters
It is the correct way to cache package manager directories inside a Dockerfile — the download cache survives, but it never bloats the shipped image.
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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.Container registryA container registry is a service that stores and distributes container images, such as GitHub Container Registry, Docker Hub or Amazon ECR.