So I was playing around with devicemapper docker storage driver the other day. It was quite nice but when I stopped the modified docker daemon and tried to start the docker service in “normal” way, I received the following error:
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root@carbon:~# service docker start Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details. |
Clearly something had gone wrong. Upon running:
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systemctl status docker.service |
I found the following line most helpful in fixing the error:
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Jan 24 22:33:17 carbon dockerd[3753]: Error starting daemon: error initializing graphdriver: /var/lib/docker contains several valid graphdrivers: devicemapper, aufs; Please cleanup or explicitly choose storage driver (-s |
So I ran the following command in order to remove my devicemapper driver:
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rm -rf /var/lib/docker/devicemapper |
Boom it worked!
Alternatively, I could’ve backed it up to tmp instead by running:
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mv /var/lib/docker/devicemapper /tmp/ |
But I didn’t need any of my images anyway so I removed it.
Hope this helps.