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- 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>