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v1.md image spec formatting fix 2018-05-13 13:30:53 -04:00

Docker Image Specification v1.

This directory contains documents about Docker Image Specification v1.X.

The v1 file layout and manifests are no longer used in Moby and Docker, except in docker save and docker load.

However, v1 Image JSON (application/vnd.docker.container.image.v1+json) has been still widely used and officially adopted in V2 manifest and in OCI Image Format Specification.

v1.X rough Changelog

All 1.X versions are compatible with older ones.

v1.2

  • Implemented in Docker v1.12 (July, 2016)
  • The official spec document was written in August 2016 (#25750)

Changes:

  • Healthcheck struct was added to Image JSON

v1.1

  • Implemented in Docker v1.10 (February, 2016)
  • The official spec document was written in April 2016 (#22264)

Changes:

  • IDs were made into SHA256 digest values rather than random values
  • Layer directory names were made into deterministic values rather than random ID values
  • manifest.json was added

v1

  • The initial revision
  • The official spec document was written in late 2014 (#9560), but actual implementations had existed even earlier