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1. Stop the docker daemon

sudo service docker stop

2. Add a configuration file to tell the docker daemon what is the location of the data directory Using your preferred text editor add a file named daemon.json under the directory /etc/docker.

sudo vim /etc/docker/daemon.json

The file should have this content:

{ 
   "graph": "/path/to/your/docker" 
}

or if you are using nvidia docker then

{
    "runtimes": {
        "nvidia": {
            "path": "nvidia-container-runtime",
            "runtimeArgs": []
        }
    },
    "graph": "/media/LFS/docker"   
}

3. Copy the current data directory to the new one

sudo rsync -aP /var/lib/docker/ /path/to/your/docker

4. Rename the old docker directory

sudo mv /var/lib/docker /var/lib/docker.old

This is just a sanity check to see that everything is ok and docker daemon will effectively use the new location for its data.

5. Restart the docker daemon

sudo service docker start

6. Test If everything is ok you should see no differences in using your docker containers. When you are sure that the new directory is being used correctly by docker daemon you can delete the old data directory.

sudo rm -rf /var/lib/docker.old
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