Hi everyone! @Aaron Prescott and I are trying to set up our first flows on Prefect cloud using an aws EKS agent. Right now we are getting stuck when trying to specify the storage in aws ECR. When I run

storage = Docker(registry_url="https://<our account id>.<http://dkr.ecr.eu-west-1.amazonaws.com/data/prefect-application/%22|dkr.ecr.eu-west-1.amazonaws.com/data/prefect-application/">)
storage.build()

I get this error

[2021-07-13 14:32:00+0100] INFO - prefect.Docker | Building the flow's Docker storage...
invalid reference format
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/hilaryroberts/.pyenv/versions/3.8.11/lib/python3.8/site-packages/prefect/storage/docker.py", line 303, in build
    self._build_image(push=push)
  File "/Users/hilaryroberts/.pyenv/versions/3.8.11/lib/python3.8/site-packages/prefect/storage/docker.py", line 369, in _build_image
    raise ValueError(
ValueError: Your docker image failed to build!  Your flow might have failed one of its deployment health checks - please ensure that all necessary files and dependencies have been included.

It should be using the default image from the prefecthq dockerhub, so I wonder why it's failing to build. Anyone know what I might be doing wrong?

Hey @Hilary Roberts, just clarifying, does this happen on flow registration or execution?

On registration

You’re not providing any Dockerfile right?

No I'm not. Great thanks!

This is working for me now. Stuff I had to do: remove https from the registry url. Log-in ECR from the CLI. Create the repository that matches the image_name.

from prefect.storage import docker
from prefect.storage.docker import Docker
from prefect import task, Flow

@task
def abc(x):
    return x

with Flow("ecs_test") as flow:
    abc(1)

storage = Docker(registry_url="<http://0298646XXXXX.dkr.ecr.us-east-2.amazonaws.com/|0298646XXXXX.dkr.ecr.us-east-2.amazonaws.com/>", image_name="ecs_test")
flow.storage = storage

Great! That worked. Thank you!