https://github.com/docker/distribution
https://github.com/docker/docker.github.io/blob/master/registry/deploying.md
https://stackoverflow.com/questions/24309526/how-to-change-the-docker-image-installation-directory

Prereq : Docker installed

Prereq : Docker config

/etc/docker/daemon.json
graph: /tank/docker/graph

docker info | grep "Docker Root Dir"

docker pull ubuntu:16.04 # pull from hub
docker tag ubuntu:16.04 localhost:5000/my-ubuntu # tag for registry
docker push localhost:5000/my-ubuntu # push to registry
docker image remove ubuntu:16.04 # nuke local cache
docker image remove localhost:5000/my-ubuntu # nuke local cached
docker pull localhost:5000/my-ubuntu # pull from registry


docker run --name registry \
  --restart unless-stopped \\
  -p 5000:5000 \
  -e TZ=UTC \\
  -e DEBUG=1 \\
  -e REGISTRY_HTTP_ADDR=0.0.0.0:5000 \
  -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/domain.crt \
  -e REGISTRY_HTTP_TLS_KEY=/certs/domain.key \
  -e REGISTRY_AUTH=htpasswd \
  -e REGISTRY_AUTH_HTPASSWD_REALM="Registry Realm" \
  -e REGISTRY_AUTH_HTPASSWD_PATH=/auth/htpasswd \
  -v /path/data:/var/lib/registry
  -v /path/certs:/certs
  -v /path/auth:/auth
  registry/registry:$tag