Docker can't connect to docker daemon?

Question

After I update my Docker version to `0.8.0`, I get an error message while entering `sudo docker version`: Client version: 0.8.0 Go version (client): go1.2 Git commit (client): cc3a8c8 2014/02/19 12:54:16 Can't connect to docker daemon. Is 'docker -d' running on this host? And I've followed the instructions and entered command `sudo docker -d`, and I got this: [/var/lib/docker|2462000b] +job initserver() [/var/lib/docker|2462000b.initserver()] Creating server open /var/lib/docker/aufs/layers/cf2414da53f9bcfaa48bc3d58360d7f1cfd3784e4fe51fbef95197709dfc285d: no such file or directory[/var/lib/docker|2462000b] -job initserver() = ERR (1) 2014/02/19 12:55:57 initserver: open /var/lib/docker/aufs/layers/cf2414da53f9bcfaa48bc3d58360d7f1cfd3784e4fe51fbef95197709dfc285d: no such file or directory How do I solve the problem?

Answer 1

I would check to see what errors are being sent to journald (journalctl -xe --unit=docker) for more details. Many times you upgrade docker and certain file layers create problems. One way is to do a clean install by removing the folder /var/docker/lib. This will get rid of EVERYTHING (docker volumes, images, containers, etc) so be careful if you don't want to do that.

Another thing, it looks like it's trying to open a file with the AUFS storage driver. Make sure you have not change the driver to overlay2 or devicemapper and that aufs is supported on your version.