Docker device-mapper Storage Backend
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External
- https://docs.docker.com/engine/userguide/storagedriver/device-mapper-driver/
- https://docs.docker.com/storage/storagedriver/device-mapper-driver/
Internal
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.