2c59be7011
- relates to96b29f5a1f- similar to08e4e88482The daemon currently provides support for API versions all the way back to v1.24, which is the version of the API that shipped with docker 1.12.0 (released in 2016). Such old versions of the client are rare, and supporting older API versions has accumulated significant amounts of code to remain backward-compatible (which is largely untested, and a "best-effort" at most). This patch updates the minimum API version to v1.44, matching the minimum version of the client, and matching the API version of docker v25.0, which is the oldest supported version (through Mirantis MCR). The intent is to start deprecating older API versions when daemons implementing them reach EOL. This patch does not yet remove backward-compatibility code for older API versions, and the DOCKER_MIN_API_VERSION environment variable allows overriding the minimum version (to allow restoring the behavior from before this patch), however, API versions below v1.44 should be considered "best effort", and we may remove compatibility code to provide "degraded" support. With this patch the daemon defaults to API v1.44 as minimum: docker version Client: Version: 28.5.0 API version: 1.51 Go version: go1.24.7 Git commit: 887030f Built: Thu Oct 2 14:54:39 2025 OS/Arch: linux/arm64 Context: default Server: Engine: Version: dev API version: 1.52 (minimum version 1.44) .... Trying to use an older version of the API produces an error: DOCKER_API_VERSION=1.43 docker version Client: Version: 28.5.0 API version: 1.43 (downgraded from 1.51) Go version: go1.24.7 Git commit: 887030f Built: Thu Oct 2 14:54:39 2025 OS/Arch: linux/arm64 Context: default Error response from daemon: client version 1.43 is too old. Minimum supported API version is 1.44, please upgrade your client to a newer version To restore the previous minimum, users can start the daemon with the DOCKER_MIN_API_VERSION environment variable set: DOCKER_MIN_API_VERSION=1.24 dockerd API 1.24 is the oldest supported API version; docker version Client: Version: 28.5.0 API version: 1.24 (downgraded from 1.51) Go version: go1.24.7 Git commit: 887030f Built: Thu Oct 2 14:54:39 2025 OS/Arch: linux/arm64 Context: default Server: Engine: Version: dev API version: 1.52 (minimum version 1.24) .... When using the `DOCKER_MIN_API_VERSION` with a version of the API that is not supported, an error is produced when starting the daemon; DOCKER_MIN_API_VERSION=1.23 dockerd --validate invalid DOCKER_MIN_API_VERSION: minimum supported API version is 1.24: 1.23 DOCKER_MIN_API_VERSION=1.99 dockerd --validate invalid DOCKER_MIN_API_VERSION: maximum supported API version is 1.52: 1.99 Specifying a malformed API version also produces the same error; DOCKER_MIN_API_VERSION=hello dockerd --validate invalid DOCKER_MIN_API_VERSION: minimum supported API version is 1.24: hello Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
The Moby Project
Moby is an open-source project created by Docker to enable and accelerate software containerization.
It provides a "Lego set" of toolkit components, the framework for assembling them into custom container-based systems, and a place for all container enthusiasts and professionals to experiment and exchange ideas. Components include container build tools, a container registry, orchestration tools, a runtime and more, and these can be used as building blocks in conjunction with other tools and projects.
Principles
Moby is an open project guided by strong principles, aiming to be modular, flexible and without too strong an opinion on user experience. It is open to the community to help set its direction.
- Modular: the project includes lots of components that have well-defined functions and APIs that work together.
- Batteries included but swappable: Moby includes enough components to build fully featured container systems, but its modular architecture ensures that most of the components can be swapped by different implementations.
- Usable security: Moby provides secure defaults without compromising usability.
- Developer focused: The APIs are intended to be functional and useful to build powerful tools. They are not necessarily intended as end user tools but as components aimed at developers. Documentation and UX is aimed at developers not end users.
Audience
The Moby Project is intended for engineers, integrators and enthusiasts looking to modify, hack, fix, experiment, invent and build systems based on containers. It is not for people looking for a commercially supported system, but for people who want to work and learn with open source code.
Relationship with Docker
The components and tools in the Moby Project are initially the open source components that Docker and the community have built for the Docker Project. New projects can be added if they fit with the community goals. Docker is committed to using Moby as the upstream for the Docker Product. However, other projects are also encouraged to use Moby as an upstream, and to reuse the components in diverse ways, and all these uses will be treated in the same way. External maintainers and contributors are welcomed.
The Moby project is not intended as a location for support or feature requests for Docker products, but as a place for contributors to work on open source code, fix bugs, and make the code more useful. The releases are supported by the maintainers, community and users, on a best efforts basis only. For customers who want enterprise or commercial support, Docker Desktop and Mirantis Container Runtime are the appropriate products for these use cases.
Legal
Brought to you courtesy of our legal counsel. For more context, please see the NOTICE document in this repo.
Use and transfer of Moby may be subject to certain restrictions by the United States and other governments.
It is your responsibility to ensure that your use and/or transfer does not violate applicable laws.
For more information, please see https://www.bis.doc.gov
Licensing
Moby is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.