kewogc/relocating_docker_root.md

## relocating_docker_root.md

      
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              relocating_docker_root.md
            
          
    Stop the Docker services:
  sudo systemctl stop docker
  sudo systemctl stop docker.socket
  sudo systemctl stop containerd

Copy docker root files to new dir
sudo rsync -aP /var/lib/docker/ /some_new_dir

Change docker config data-root
sudo vi /etc/docker/daemon.json
# add or change to
{
  "data-root": "/some_new_dir"
}

Rename docker root to old
sudo mv /var/lib/docker /var/lib/docker.old

Start docker service
sudo systemctl start docker
Validate the new Docker root location:
docker info -f '{{ .DockerRootDir}}'

If after start docker containers we got error like:
Error response from daemon: error evaluating symlinks from mount source "/var/lib/docker/volumes/.../_data": lstat /var/lib/docker: no such file or directory

We need to change configs in containers:
find /some_new_dir -type f -name 'config.v2.json' -exec sed -i 's%/var/lib/docker%/some_new_dir%g' {} \;

If everything is ok, remove old docker root
sudo rm -rf /var/lib/docker.old