@Marvin can you give me a working version on how to deploy a worker to ECS especially for now it doesn't pull the right image?

Could you please confirm which version of Prefect you are using? The deployment process and syntax can vary between Prefect 2.x and 3.x.

Prefect 3.x

It looks like there are a couple of known issues related to deploying Prefect workers to ECS, especially concerning the pulling of the correct Docker image: 1. Concurrent Task Definition Registration: Some users have reported issues with multiple Prefect flows starting simultaneously in an ECS work pool, leading to failures in creating new task revisions. It appears this could be related to how task definitions are registered in ECS. You might look into setting environment variables such as

AWS_RETRY_MODE=adaptive

and

AWS_MAX_ATTEMPTS=100

in your worker Dockerfile, although some have reported mixed results with these settings. You can read more about this issue here: GitHub Issue 15865. 2. CannotPullContainerError: Another reported problem is with pulling the correct Docker image due to authorization failures or network issues, which could be causing the "CannotPullContainerError". There has been discussion around implementing retries for infrastructure creation failures, which might help in cases where transient network issues are causing failures. More on this issue can be found at GitHub Issue 11637. If you're encountering such errors, you might try checking your ECS configuration, particularly with respect to credentials and network access for pulling Docker images. Ensuring that the correct permissions and network settings are in place is crucial. For specific instructions on deploying Prefect to ECS, you would typically define an ECS work pool and configure your task definition properly, including the image and any role permissions required. Though I ran into some issues accessing detailed Prefect 3.x documentation at the moment, you should still find useful guidance directly on the Prefect documentation site by using queries related to ECS deployment. Once you've tackled these issues, I'm sure your deployment will feel like a shiny new robot (with less existential crises!) trundling happily through the cloud. If further detailed guidance is needed, visiting Prefect's Community Slack or GitHub discussions might offer additional real-world insights.

@Marvin in my case it pulls the default Prefect image instead from ECR why is that so?

When deploying Prefect workers to ECS with a custom Docker image stored on Amazon ECR, issues can arise if the configuration doesn't properly specify or authenticate your image source. Here are a few important points to ensure everything is set up correctly: 1. ECR Permissions: Make sure you have the appropriate permissions set up for AWS ECR. Specifically, permissions such as

ecr:CreateRepository

,

ecr:DescribeRepositories

, and

ecr:GetAuthorizationToken

are critical. Consider using AWS managed policies like

AmazonEC2ContainerRegistryFullAccess

to simplify permission management. 2. Specifying the Custom Docker Image: In your Prefect configuration, ensure you're specifying the correct Docker image URI from ECR. This is often something like

<aws_account_id>.dkr.ecr.<region>.<http://amazonaws.com/<repository>:<tag|amazonaws.com/<repository>:<tag>>

. 3. Authentication Configuration: Make sure your ECS task definitions or the ECS worker itself is set up to authenticate with ECR correctly. This often involves configuring the correct IAM roles and permissions. 4. Deployment Configuration: When you create your deployment, ensure you're using directives that specify your custom image, rather than defaults which might revert to using Prefect's published images. For selecting a custom Docker image, Prefect lets you build and use your own Dockerfile. You might need to specify this in your deployment's configuration to avoid it defaulting back to Prefect's standard setup. For more guidance, take a look at the Prefect integration for AWS ECS: ECS Worker Guide and infrastructure deployment instructions: Infrastructure Examples. If these adjustments don't resolve the issue, you might be experiencing a more subtle configuration or network issue. In such cases, logging from both ECS and ECR could provide more detailed insights. Remember, even though it might feel like the cloud is conspiring against you, it's all just electrons being a bit temperamental!