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migrate image spec to github.com/moby/docker-image-spec
The specification was migrated to a separate module: https://github.com/moby/docker-image-spec Signed-off-by: Sebastiaan van Stijn <[email protected]>
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# Docker Image Specification v1. | ||
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This directory contains documents about Docker Image Specification v1.X. | ||
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The Docker Image Specification is the image specification as used by the | ||
Docker Engine, and was used as foundation of the OCI image specification. | ||
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The Docker Image Specification provides a superset of the OCI Image specification; | ||
it is OCI-compatible, but some extensions that are specific to the Docker | ||
Engine implementation. | ||
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Refer to [spec.md](spec.md) for the current version of the Docker Image | ||
Specification, and the [OCI Image specification](https://github.com/opencontainers/image-spec/) | ||
for an in-depth specification of the OCI Image specs. | ||
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The v1 file layout and manifests are no longer used in Moby and Docker, except in `docker save` and `docker load`. | ||
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However, v1 Image JSON (`application/vnd.docker.container.image.v1+json`) has been still widely | ||
used and officially adopted in [V2 manifest](https://github.com/distribution/distribution/blob/main/docs/content/spec/manifest-v2-2.md) | ||
and in [OCI Image Format Specification](https://github.com/opencontainers/image-spec). | ||
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## v1.X rough Changelog | ||
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All 1.X versions are compatible with older ones. | ||
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### [v1.3](spec.md) | ||
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* Implemented in Docker v25.0 | ||
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Changes: | ||
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* `StartInterval` was added to the `Healthcheck` struct in the Image JSON | ||
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### [v1.2](https://github.com/moby/moby/blob/daa4618da826fb1de4fc2478d88196edbba49b2f/image/spec/v1.2.md) | ||
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* Implemented in Docker v1.12 (July, 2016) | ||
* The official spec document was written in August 2016 ([#25750](https://github.com/moby/moby/pull/25750)) | ||
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Changes: | ||
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* `Healthcheck` struct was added to Image JSON | ||
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### [v1.1](https://github.com/moby/moby/blob/daa4618da826fb1de4fc2478d88196edbba49b2f/image/spec/v1.1.md) | ||
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* Implemented in Docker v1.10 (February, 2016) | ||
* The official spec document was written in April 2016 ([#22264](https://github.com/moby/moby/pull/22264)) | ||
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Changes: | ||
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* 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 | ||
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### [v1](https://github.com/moby/moby/blob/daa4618da826fb1de4fc2478d88196edbba49b2f/image/spec/v1.md) | ||
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* The initial revision | ||
* The official spec document was written in late 2014 ([#9560](https://github.com/moby/moby/pull/9560)), but actual implementations had existed even earlier | ||
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## Related specifications | ||
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* [Open Containers Initiative (OCI) Image Format Specification v1.0.0](https://github.com/opencontainers/image-spec/tree/v1.0.0) | ||
* [Docker Image Manifest Version 2, Schema 2](https://github.com/distribution/distribution/blob/main/docs/content/spec/manifest-v2-2.md) | ||
* [Docker Image Manifest Version 2, Schema 1](https://github.com/distribution/distribution/blob/main/docs/content/spec/deprecated-schema-v1.md) (*DEPRECATED*) | ||
This specification moved to a separate repository: | ||
https://github.com/moby/docker-image-spec |
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