How to change the Docker Images directory

change_docker_images_directory.sh

#!/bin/bash
# How to change the Docker images directory (default dir=/var/lib/docker)
# The simplest method is to create a symbolic link that maps your destination partition and the original docker images directory
# see REF: https://forums.docker.com/t/how-do-i-change-the-docker-image-installation-directory/1169

# remove all containers
docker ps -aq | xargs docker rm

# stop docker daemon
systemctl stop docker

# move all images from /var/lib/docker to the destination partition/dir (mount it first)
mv /var/lib/docker $destination

# create a symbolic link that maps your destination and the original docker images directory
ln -s $destination /var/lib/docker  # the symbolic link must be in /var/lib/ with the name: 'docker' pointing to $destination

# start docker daemon
systemctl start docker

The preferred way nowadays is to create /etc/docker/daemon.json file and add:

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

---

Storage Driver tips:
EXT4 -> use overlay2
NTFS -> use devicemapper

To change the Storage Driver that Docker uses, add to /etc/docker/daemon.json file:

{
  "storage-driver": "devicemapper"
}

---

to automount partitions, add to /etc/fstab:
/dev/disk/by-uuid/xxx-xxx-xxx /mnt/store ext4 rw,suid,dev,exec,auto,async 0 0

On fedora, prefer /run/media/store

If system asks password to open store, just change ownership:
sudo chown user:user /mnt/store