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Docker · Concept

Image layer

Docker images are stacks of read-only layers. Docker reuses unchanged layers during builds, while each container adds a separate writable layer for its file changes.

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Syntax

docker image history [OPTIONS] IMAGE

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  • Dockerfile
  • docker image history
  • docker diff
  • docker build cache
  • volumes
  • bind mounts
  • union filesystem

Source: How image layers and the build cache work | Docker Learn. Checked 2026-11-03.