Tags: [docker]
Instructions copied from this site
By default Docker stores its data in /var/lib/docker
To move this data:
sudo service docker stop
Add this to /etc/docker/daemon.json (file might not exist)
{
"data-root": "/path/to/your/docker"
}
sudo rsync -aP /var/lib/docker/ /path/to/your/docker
sudo mv /var/lib/docker /var/lib/docker.old
sudo service docker start
Test
sudo rm -rf /var/lib/docker.old