Hi, I'm trying to work through flow registration with cloud using Docker storage

Hey @Adam Roderick - I recommend working on this with Docker directly instead of through Prefect’s

.register()

call; I suggest starting by trying to pull your

base_image

or push to your configured

registry_url

and seeing if that raises the same error

Thanks, @Chris White. I'll try that

Hey @Adam Roderick, I think I had a similar error message at first when trying to register DockerStorage with a private ECR. Double-check the Docker-related configurations that you pass to the Storage object, especially stuff like

base_url

-- the defaults may not be optimal. For me in the end, it turned out I had to pass

tls_config

since the running Docker was configured with that level of security. Otherwise the authentication failed

Thanks @Arsenii. By walking through the steps using the docker CLI, I was able to get past the issue

One thing I have to do is call 

boto3.client('ecr').create_repository()

Ah, interesting. I'm basically reusing the same repository but assign unique tags to each flow's docker image -- so no need to create new repos all the time

That's a good idea. In our use case, we need many repos