Stop the Docker services:
```
  sudo systemctl stop docker
  sudo systemctl stop docker.socket
  sudo systemctl stop containerd
```

Copy docker root files to new dir
```
sudo rsync -aP /var/lib/docker/ /some_new_dir
```

Change docker config data-root
```
sudo vi /etc/docker/daemon.json
# add or change to
{
  "data-root": "/some_new_dir"
}
```

Rename docker root to old
```
sudo mv /var/lib/docker /var/lib/docker.old
```



Start docker service
```sudo systemctl start docker```

Validate the new Docker root location:
```
docker info -f '{{ .DockerRootDir}}'
```

If after start docker containers we got error like:
```
Error response from daemon: error evaluating symlinks from mount source "/var/lib/docker/volumes/.../_data": lstat /var/lib/docker: no such file or directory
```
We need to change configs in containers:
```
#stop docker, see first step.
find /some_new_dir -type f -name 'config.v2.json' -exec sed -i 's%/var/lib/docker%/some_new_dir%g' {} \;
#start dockers services
```

If everything is ok, remove old docker root
```
sudo rm -rf /var/lib/docker.old

```