Data Directory

Check root directory

docker info | grep -i "root dir"

Create directory

sudo mkdir -p /appdata/docker

Copy files

sudo rsync -aP /var/lib/docker/ /appdata/docker/

Update configuration

sudo vi /etc/docker/daemon.json

{
  "data-root": "/appdata/docker"
}

Restart service

sudo systemctl restart docker.socket
sudo systemctl restart docker.service

Check status

sudo systemctl status docker.socket
sudo systemctl status docker.service

Check root directory

docker info | grep -i "root dir"