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The Docker daemon provides a versioned API for backward compatibility with old clients. Docker clients can perform API-version negotiation to select the most recent API version supported by the daemon (downgrading to and older version of the API when necessary). API version negotiation was introduced in Docker v1.12.0 (API 1.24), and clients before that used a fixed API version. Docker Engine versions through v25.0 provide support for all [API versions](https://docs.docker.com/engine/api/#api-version-matrix) included in stable releases for a given platform. For Docker daemons on Linux, the earliest supported API version is 1.12 (corresponding with Docker Engine v1.0.0), whereas for Docker daemons on Windows, the earliest supported API version is 1.24 (corresponding with Docker Engine v1.12.0). Support for legacy API versions (providing old API versions on current versions of the Docker Engine) is primarily intended to provide compatibility with recent, but still supported versions of the client, which is a common scenario (the Docker daemon may be updated to the latest release, but not all clients may be up-to-date or vice versa). Support for API versions before that (API versions provided by EOL versions of the Docker Daemon) is provided on a "best effort" basis. Use of old API versions is very rare, and support for legacy API versions involves significant complexity (Docker 1.0.0 having been released 10 years ago). Because of this, we'll start deprecating support for legacy API versions. Docker Engine v25.0 by default disables API version older than 1.24 (aligning the minimum supported API version between Linux and Windows daemons). When connecting with a client that uses an API version version older than 1.24, the daemon returns an error. The following example configures the docker CLI to use API version 1.23, which produces an error: DOCKER_API_VERSION=1.23 docker version Error response from daemon: client version 1.23 is too old. Minimum supported API version is 1.24, please upgrade your client to a newer version An environment variable (`DOCKER_MIN_API_VERSION`) is introduced that allows re-enabling older API versions in the daemon. This environment variable must be set in the daemon's environment (for example, through a [systemd override file](https://docs.docker.com/config/daemon/systemd/)), and the specified API version must be supported by the daemon (`1.12` or higher on Linux, or `1.24` or higher on Windows). Support for API versions lower than `1.24` will be permanently removed in Docker Engine v26, and the minimum supported API version will be incrementally raised in releases following that. We do not recommend depending on the `DOCKER_MIN_API_VERSION` environment variable other than for exceptional cases where it's not possible to update old clients, and those clients must be supported. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Docker CLI
About
This repository is the home of the Docker CLI.
Development
docker/cli is developed using Docker.
Build CLI from source:
docker buildx bake
Build binaries for all supported platforms:
docker buildx bake cross
Build for a specific platform:
docker buildx bake --set binary.platform=linux/arm64
Build dynamic binary for glibc or musl:
USE_GLIBC=1 docker buildx bake dynbinary
Run all linting:
docker buildx bake lint shellcheck
Run test:
docker buildx bake test
List all the available targets:
make help
In-container development environment
Start an interactive development environment:
make -f docker.Makefile shell
Legal
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For more information, please see https://www.bis.doc.gov
Licensing
docker/cli is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.