how to update docker image from registry code example

Example 1: docker pull command

docker pull ubuntu:14.04

docker pull ubuntu
docker pull fedora

NOTE:
Docker Hub contains many pre-built images that you can pull
docker pull :
docker pull 

Example 2: docker url image

For those trying to create a Google Cloud instance using the "Deploy a container image to this VM instance." option then the correct url format would be

docker.io/:version

The suggestion above of registry.hub.docker.com/library/ did not work for me.

I finally found the solution here (in my case, i was trying to run docker.io/tensorflow/serving:latest)