It sounds intuitive that you may just move the /var/lib/docker dir to another location and symlink it back but it won't work and you'll get an error.

How to move Docker Storage the Correct Way

This assumes that you want to use /mnt/raid as the new location.

1.) Stop Docker

systemctl stop docker

2.) Move /var/lib/docker

mv /var/lib/docker /mnt/raid/

3.) Edit the Docker daemon file

Specify the path you want in the data-root parameter eg.

data-data: /mnt/raid/docker

Edit the docker daemonfile.

vi /etc/docker/daemon.json


{
"data-root": "/mnt/raid/docker"
}


Remember if you have other options in daemon.json and you put data-root first, you need to put a "," at the end:

"data-root": "/mnt/raid/docker",

4.) Restart Docker

Restart Docker and now everything will be working out of the /mnt/raid/docker or whatever you specified in the daemon.json

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