Docker device-mapper Storage Backend

External

• https://docs.docker.com/engine/userguide/storagedriver/device-mapper-driver/

Internal

• Docker Concepts - Storage Backend

Overview

Device-mapper driver metadata is stored in /var/lib/docker/devicemapper/metadata. Docker state can be reset by stopping docker and by removing /var/lib/docker/devicemapper/metadata directory. This will destroy existing docker images and containers and all the docker metadata.