docker tag mynginx skylogin/custom-nginx:mynginx
docker push skylogin/custom-nginx
docker pull registry
docker run -d -p 5000:5000 --restart=always --name registry registry
docker pull ubuntu
docker image tag ubuntu localhost:5000/ubuntu
docker pull 34.64.198.252:5000/ubuntu
docker pull 34.64.198.252:5000/ubuntu