This directory contains documents about Docker Image Specification v1.X.
The Docker Image Specification is the image specification as used by the Docker Engine, and was used as foundation of the OCI image specification.
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.
Refer to spec.md for the current version of the Docker Image Specification, and the OCI Image specification for an in-depth specification of the OCI Image specs.
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.
All 1.X versions are compatible with older ones.
Changes:
StartInterval
was added to the Healthcheck
struct in the Image JSONChanges:
Healthcheck
struct was added to Image JSONChanges:
manifest.json
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