Docker dm_task_run failed error

Question

Today I first time installed docker on Fedora 21. Now, I need change location of docker images folder from default /var/lib/docker.

After copying files (devicemapper sub

Answer 1

1) service docker stop

2) thin_check /home/docker/devicemapper/devicemapper/metadata

3) thin_check --clear-needs-check-flag /home/docker/devicemapper/devicemapper/metadata

4) service docker start