containerd Image Store Not Active on Remote Docker 29

      Storage Driver: overlayfs
        driver-type: io.containerd.snapshotter.v1

Cause

Docker Engine 29 enables the containerd image store by default, but only on a fresh installation. When Docker Layer Caching (DLC) is enabled, the remote Docker environment is restored from a previously cached state. 

Docker does not automatically switch the storage backend to the containerd image store, leaving the classic overlay2 driver in place.

This means version: docker29 alone is not sufficient to guarantee the containerd image store is active when DLC is in use.

Solution

Do not use Docker Layer Caching (DLC) in that job or purge the DLC if you no longer need it.

You may find the complete guide on how to purge a DLC by following this link - https://circleci.com/docs/guides/optimize/docker-layer-caching/#purge-dlc

To verify the storage driver you may use the following run command in your job:

    name: check Docker 29 storage driver
    command: |
      docker info | grep -A1 "Storage Driver"