Google has its own internal private repository. Before we can start to pull and push Docker images in the repository, we must be sure to have the credential correctly configured. To do that, open the Google SDK and execute the following command:

docker tag [SOURCE_IMAGE] [HOSTNAME]/[PROJECT-ID]/[IMAGE]:[VERSION]

docker tag practicalgcpgo eu.gcr.io/practicaldevopsgcpcli/practicalgpc:1.0

docker push [HOSTNAME]/[PROJECT-ID]/[IMAGE]:[VERSION]