- Why docker daemon fails to start with the message "Unable to take ownership of thin-pool (XXX-docker--pool) that already has used data blocks" in Red Hat Enterprise Linux 7 ?
Details from the log
Sep 17 17:00:01 XXXX dockerd-current: time="2017-09-17T17:00:01.522516125+10:00" level=fatal msg="Error starting daemon: error initializing graphdriver: devmapper: Unable to take ownership of thin-pool (rootvg-docker--pool) that already has used data blocks" Sep 17 17:00:01 XXXX systemd: docker.service: main process exited, code=exited, status=1/FAILURE
- Red Hat Enterprise Linux 7.4
- Existing docker installation based on docker-1.12.6-48 configured with user namespaces option as described in the documentation
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