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deprecate legacy image formats 

Mark pulling legacy image formats as deprecated, and describe the
DOCKER_ENABLE_DEPRECATED_PULL_SCHEMA_1_IMAGE environment variable.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Sebastiaan van Stijn 2024-03-04 09:14:25 +01:00
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34
docs/deprecated.md
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@ -72,7 +72,7 @@ The table below provides an overview of the current status of deprecated feature
| Removed | [`docker build --stream` flag (experimental)](#docker-build---stream-flag-experimental) | v20.10 | v20.10 |
| Deprecated | [`fluentd-async-connect` log opt](#fluentd-async-connect-log-opt) | v20.10 | - |
| Removed | [Configuration options for experimental CLI features](#configuration-options-for-experimental-cli-features) | v19.03 | v23.0 |
| Deprecated | [Pushing and pulling with image manifest v2 schema 1](#pushing-and-pulling-with-image-manifest-v2-schema-1) | v19.03 | v20.10 |
| Deprecated | [Pushing and pulling with image manifest v2 schema 1](#pushing-and-pulling-with-image-manifest-v2-schema-1) | v19.03 | v27.0 |
| Removed | [`docker engine` subcommands](#docker-engine-subcommands) | v19.03 | v20.10 |
| Removed | [Top-level `docker deploy` subcommand (experimental)](#top-level-docker-deploy-subcommand-experimental) | v19.03 | v20.10 |
| Removed | [`docker stack deploy` using "dab" files (experimental)](#docker-stack-deploy-using-dab-files-experimental) | v19.03 | v20.10 |
@ -558,15 +558,35 @@ for the old option will be removed in a future release.
**Deprecated in Release: v19.03**
**Target For Removal In Release: v20.10**
**Disabled by default in Release: v26.0**
The image manifest
[v2 schema 1](https://github.com/docker/distribution/blob/fda42e5ef908bdba722d435ff1f330d40dfcd56c/docs/spec/manifest-v2-1.md)
format is deprecated in favor of the
[v2 schema 2](https://github.com/docker/distribution/blob/fda42e5ef908bdba722d435ff1f330d40dfcd56c/docs/spec/manifest-v2-2.md) format.
**Target For Removal In Release: v27.0**
If the registry you are using still supports v2 schema 1, urge their administrators to move to v2 schema 2.
The image manifest [v2 schema 1](https://distribution.github.io/distribution/spec/deprecated-schema-v1/)
and "Docker Image v1" formats were deprecated in favor of the
[v2 schema 2](https://distribution.github.io/distribution/spec/manifest-v2-2/)
and [OCI image spec](https://github.com/opencontainers/image-spec/tree/v1.1.0)
formats.
These legacy formats should no longer be used, and users are recommended to
update images to use current formats, or to upgrade to more current images.
Starting with Docker v26.0, pulling these images is disabled by default, and
produces an error when attempting to pull the image:
```console
$ docker pull ubuntu:10.04
Error response from daemon:
[DEPRECATION NOTICE] Docker Image Format v1 and Docker Image manifest version 2, schema 1 support is disabled by default and will be removed in an upcoming release.
Suggest the author of docker.io/library/ubuntu:10.04 to upgrade the image to the OCI Format or Docker Image manifest v2, schema 2.
More information at https://docs.docker.com/go/deprecated-image-specs/
```
An environment variable (`DOCKER_ENABLE_DEPRECATED_PULL_SCHEMA_1_IMAGE`) is
added in Docker v26.0 that allows re-enabling support for these image formats
in the daemon. This environment variable must be set to a non-empty value in
the daemon's environment (for example, through a [systemd override file](https://docs.docker.com/config/daemon/systemd/)).
Support for the `DOCKER_ENABLE_DEPRECATED_PULL_SCHEMA_1_IMAGE` environment-variable
will be removed in Docker v27.0 after which this functionality is removed permanently.
### `docker engine` subcommands