Docker error : no space left on device

Question

I installed docker on a Debian 7 machine in the following way

$ echo deb http://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list
$          


        

Answer 1

I also encountered this issue on RHEL machine. I did not find any apt solution anywhere on stack-overflow and docker-hub community. If you are facing this issue even after below command:

docker system prune --all

The solution which worked finally:

1. docker info
   • To check current docker storage driver
   • Mine was : Storage Driver: devicemapper; If you have storage driver as overlay2 nothing to worry about. Solution will still work for you.
2. df -h
   • This is to check the available file systems on machine and the path where they are mounted. Two mounted path to have a note:
   • /dev/mapper/rootvg-var 7.6G 1.2G 6.1G 16% /var
   • /dev/mapper/rootvg-apps 60G 9.2G 48G 17% /apps
   • Note- By default docker storage path is /var/lib/docker. It has available space ~6 GB and hence all the space related issues. So basically, I have to move default storage to some other storage where available space is more. For me its File sysyem path '/dev/mapper/rootvg-apps' which is mounted on /apps. Now task is to move /var/lib/docker to something like /apps/newdocker/docker.
3. mkdir /apps/newdocker/docker
4. chmod -R 777 /apps/newdocker/docker
5. Update docker.serive file on linux which resides under: /usr/lib/systemd/system
   • vi /usr/lib/systemd/system/docker.service
6. if storage device is devicemapper , comment existing ExecStart line and add below under [Service]:
   • ExecStart=
   • ExecStart=/usr/bin/dockerd -s devicemapper --storage-opt dm.fs=xfs --storage-opt dm.basesize=40GB -g /apps/newdocker/docker --exec-opt native.cgroupdriver=cgroupfs
7. Or if storage device is overlay2:
   • just add -g /apps/newdocker/docker in the existing ExexStart statement.
   • Something like ExecStart=/usr/bin/dockerd -g /apps/newdocker/docker -H fd:// --containerd=/run/containerd/containerd.sock
8. rm -rf /var/lib/docker (It will delete all existing docker data)
9. systemctl stop docker
10. ps aux | grep -i docker | grep -v grep
    • If no output has been produced by the above command, reload systemd daemon by below command.
11. systemctl daemon-reload
12. systemctl start docker
13. docker info
    • Check out the Data Space Available: 62.15GB after mouting to docker to new File system.
14. DONE