@Marvin the documentation regarding ECR is a bit confusing. After infrastructure provisioning completes, you will be logged into your new ECR repository and the default Docker build namespace will be set to the URL of the registry. While the default namespace is set, you will not need to provide the registry URL when building images as part of your deployment process. To take advantage of this, you can write your deploy scripts like this:

example_deploy_script.py
from prefect import flow
from prefect.deployments import DeploymentImage

@flow(log_prints=True)            
def my_flow(name: str = "world"):                          
    print(f"Hello {name}! I'm a flow running in a ECS task!") 


if __name__ == "__main__":
    my_flow.deploy(
        name="my-deployment", 
        work_pool_name="my-work-pool",
        image=DeploymentImage(                                                 
            name="my-repository:latest",
            platform="linux/amd64",
        )                                                                      
    )

This will build an image with the tag

<ecr-registry-url>/my-image:latest

and push it to the registry. Your image name will need to match the name of the repository created with your work pool. You can create new repositories in the ECR console. Where does the image name my-image come from?

Based on the documentation excerpt from Prefect: It looks like the image name

my-image

in the example script seems to be a placeholder to indicate where you would put the name of your image repository. The text demonstrates the image repository URL does not need to be specified in the build step because it is implied by the default Docker build namespace, which should be set to the ECR registry URL upon provisioning the infrastructure. The excerpt from the documentation on deploying with Prefect shows a generic

image_name: my-repo/my-image

configuration, which suggests that

my-image

is part of the

image_name

key that should be replaced with the name of your image on the ECR. In the script you are using,

my-repository:latest

serves as the image name (

my-repository

) and the tag (

latest

). This tag will be prefixed with the ECR registry URL automatically. In proper usage, "my-repository" should match the name of the repository associated with your work pool in ECR. If you have named your repository differently in ECR, you should use that name instead of

my-repository

or

my-image

.

@Marvin will prefect create a new repository on ecr? ECR usually has one repo per imagename

In the Prefect deployment flow, Prefect itself does not create a new repository on ECR. The repository needs to be created manually in the ECR console or through infrastructure as code tools like Terraform or AWS CloudFormation. When you define the

DeploymentImage

with the

name

parameter, it is assumed that the repository you're referencing already exists in ECR. Therefore, before you can successfully deploy and push an image, you must ensure the ECR repository with that name is already set up. Each image name typically corresponds with one repository in ECR. The deployment process then pushes the built Docker image to that specified repository.

@Marvin given that the serverless push workflow with fargate on ecs creates one repo called prefect-flows. what is the suggested way to containerize different flows that require different containers?

The documentation excerpts did not specifically address best practices for managing multiple Prefect flows that require different containers in ECS. However, using the standard practices of container orchestration and AWS ECS, here's a suggested approach: If you're using a single repository like

prefect-flows

to hold all flow images, you need a way to distinguish between different flows that might require different container environments. One way to achieve this is to use separate tags for each flow image within the

prefect-flows

repository. For example: - Flow A might use the image

prefect-flows:flow-a-latest

- Flow B might use the image

prefect-flows:flow-b-latest

Each tag (

flow-a-latest

,

flow-b-latest

) corresponds to a different Docker image that has been built with the specific dependencies and environment required by each flow. When you configure your deployments, you specify the appropriate tag for the image you want to use for that flow. This will allow you to have different container environments for each flow while maintaining them within a single ECR repository. However, if your flows are distinct enough that they justify completely separate repositories, you would traditionally create a new ECR repository for each unique environment. This approach might require additional ECR repositories but gives you complete isolation for the container environments of your different flows. This might not be the serverless push approach but would be a more traditional way to manage different containers in ECS. Keep in mind that serverless deployments in Prefect aim to minimize the operational overhead, and in some cases, you might have to balance best practices for containerization with the conveniences of serverless workflows. If the default serverless model isn't fitting your needs, you may need to consider a more custom setup.

Thx. That makes sense.