Docker: Move Docker data directory to new location
The standard data directory used for docker is /var/lib/docker, and since this directory will store all your images, volumes, etc. it can become quite large.
Follow the steps below to move the Docker data directory to a new location. This makes especially sense if you want to avoid running out of disk space on your root partition.
Stop the Docker daemon.
sudo service docker stopEdit the config file sudo vi /etc/docker/daemon.json:
{
"data-root": "/mnt/sdb/docker"
}Copy the current directory to the new directory.
sudo rsync --delete -a /var/lib/docker/ /mnt/sdb/dockerRename the old directory.
sudo mv /var/lib/docker /var/lib/docker.oldRestart the Docker deamon.
sudo service docker startTest if all services work as expected.
docker ps -a
docker info -f '{{ .DockerRootDir}}'If everything is good, remove the old Docker directory.
sudo rm -rf /var/lib/docker.old