ERROR: (gcloud.preview) Invalid choice: 'docker'. Did you mean 'dm-v2'?

Question

Somehow I was able to push my docker image to Google Container Registry with command:

    $ gcloud preview docker push gcr.io/<my-project-xxx>/<my-image-yyy>

I ran the commands yesterday and copied them to my notes, but today pasting them to terminal in the same order I get the error:

ERROR: (gcloud.preview) Invalid choice: 'docker'. Did you mean 'dm-v2'?

Why is that? where did teh "gcloud preview docker" command are then?

Answer 1

From the release notes 0.9.65 (2015/06/17):

gcloud preview docker moved to gcloud docker.

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The command was moved out of preview in the latest version of gcloud. You can run it with:

gcloud docker push gcr.io/<my-project-xxx>/<my-image-yyy>