docker pull old build code example
Example: 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/<dockerimagename>:version
The suggestion above of registry.hub.docker.com/library/<dockerimagename> did not work for me.
I finally found the solution here (in my case, i was trying to run docker.io/tensorflow/serving:latest)