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 It is possible to change docker root directory by creating a systemd drop-in service file. This is useful when you want images and containers or docker generated files to be located in another partition or drive.

Create drop-in configuration file

1. Create the systemd directory:
   sudo mkdir /etc/systemd/system/docker.service.d/
2. Create the docker.service drop-in file:
   sudo nano /etc/systemd/system/docker.service.d/docker.root.conf
3. Add the following configuration :

[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -g /your/custom/docker/root -H fd://