Engine API and Clients

Warning

Before you upgrade MCR, upgrade every Docker client, script, and tool that communicates with the engine, to ensure that these components support Engine API 1.40 or later. Clients that fail to meet this API requirement may be unable to use the daemon following the upgrade.

MCR exposes the Docker Engine API, the minimum supported API version for which is 1.40. Any client, script, or tool that communicates with the daemon must use a Docker client or library that negotiates API 1.40 or later, or which explicitly targets a compatible version. By imposing a minimum API requirement, Mirantic is able to ensure that features added in the future are not constrained by older clients and API design.

Use Mirantis-packaged Docker CLI builds from MCR 19 onward, or another client distribution that supports Engine API 1.40 and which matches your operational requirements.

See also

• The official Docker documentation, Docker Engine API, Engine API version history, including v1.40, and Docker Engine command-line reference.

• Moby API definitions upstream versioned API packages