By default, Docker will store its data in /var/lib/docker. Sometimes it’s needed to change this location. There are several ways to do it. The easiest is to create the following file:
[Service] ExecStart= ExecStart=/usr/bin/docker daemon -H fd:// --graph="/home/docker"
Then you just need to refresh systemctl, make sure your folder exists and restart docker:
mkdir -p /home/docker systemctl daemon-reload systemctl stop docker systemctl start docker
No restart needed.