This document describes the latest changes, enhancements, known issues, and fixes for Mirantis Container Runtime (MCR) for versions 20.10.x.
In developing MCR 20.10.x, Mirantis has been transitioning from legacy Docker Hub-issued licenses to JWT licenses, as detailed below:
Versions 20.10.0 to 20.10.6: Docker Hub licenses and JWT licenses
Versions 20.10.7 and later: JWT licenses only
Using a JWT license with an MKE instance that manages MCR causes the engine to log error messages in the daemon log file, though MCR does not fail. This applies to MKE 3.4.x versions prior to 3.4.6 and MKE 3.3.x versions prior to 3.3.13.