https://docs.docker.com/registry/
https://docs.docker.com/registry/introduction/
https://docs.docker.com/registry/deploying/
sudo docker pull ubuntu:16.04
sudo docker tag ubuntu:16.04 localhost:5000/mypython
sudo docker push localhost:5000/mypython
sudo docker image remove ubuntu:16.04
sudo docker image remove localhost:5000/mypython
sudo docker pull ubuntu:16.04
sudo docker tag ubuntu:16.04 localhost:5000/myweb
sudo docker push localhost:5000/myweb
sudo docker image remove ubuntu:16.04
sudo docker image remove localhost:5000/myweb
sudo docker run -d -p 5000:5000 --restart=always --name registry registry:2
sudo docker container stop registry && sudo docker container rm -v registry