错误“无法连接到Docker守护程序。 'docker -d'是否在此主机上运行？“升级Linux内核后

Question

I am using Ubuntu 14.04 with docker v1.8.2. Docker works well before. Then I just upgraded my Linux kernel from 3.16 to 4.05 and now docker is broken.

docker images

simlw@sim-lw:~$ docker images
Cannot connect to the Docker daemon. Is 'docker -d' running on this host?

ps auxww | grep docker

simlw@sim-lw:~$ ps auxww | grep docker   
simlw    23085  0.0  0.0  15976  2276 pts/24   S+   13:12   0:00 grep --color=auto docker 

sudo docker -d

simlw@sim-lw:~$ sudo docker -d
Warning: '-d' is deprecated, it will be removed soon. See usage.
WARN[0000] please use 'docker daemon' instead.          
INFO[0000] Listening for HTTP on unix (/var/run/docker.sock) 
ERRO[0000] [graphdriver] prior storage driver "aufs" failed: driver not supported 
FATA[0000] Error starting daemon: error initializing graphdriver: driver not supported 

Does anybody know how to resolve this? thanks in advance.

Pleae note I've already read Cannot connect to the Docker daemon. Is 'docker -d' running on this host? and Docker Daemon not running , and both of them don't help me out.

Answer 1

Ubuntu dropped support for AUFS since its Kernel package version 3.18, because from that version OverlayFS is part of Linux Kernel. I think your docker daemon is trying to use AUFS driver because you have a /var/lib/docker/aufs folder. Anyway, you can force to use the correct storage driver using the -s or --storage-driver= option when running the docker daemon.

So first, to test that the daemon works with the OverlayFS storage driver, run the daemon in a terminal: sudo docker daemon -s overlay . Once you have tested it is working correctly, you can modify it permanently editing the file /etc/default/docker , adding the next line:

# Force OverlayFS for storage driver
DOCKER_OPTS="$DOCKER_OPTS -s overlay"

Answer 2

I upgraded from Debian Jessie to testing and I'm now using linux-image-4.2 and I encountered the same kind of issue with a missing aufs driver.

A quick fix is to delete the docker aufs folder. You might lose some data, so please do it with care!

sudo rm -rf /var/lib/docker/aufs

Answer 3

If the docker daemon is already runing, or you could run the command with root successfully, you may need to to add your user id to docker group with:

sudo usermod -aG docker <userid>

and then logout. If you still get the same info, try:

sudo service docker restart