To ensure every ECS Fargate task is closed properly on completion of a Prefect flow, regardless of the task's outcome, you can take several steps:
1.
Proper Configuration: Ensure that your ECS task definition and Prefect ECS work pool are correctly configured. The AWS CLI and IAM roles should have the correct permissions to manage ECS tasks.
2.
Lifecycle Management: Prefect generally handles starting and stopping ECS tasks through its deployments and flow processes. However, tasks can sometimes become "stuck" if there's an exception or error. Ensure that your Prefect tasks within your flow handle exceptions gracefully and ensure cleanup actions are specified.
3.
Use Infrastructure as Code: Consider using infrastructure management tools like Terraform. The Prefect documentation suggests using Terraform for provisioning an ECS cluster which might help in efficiently managing resources:
Prefect AWS ECS Guide.
4.
Ensure Proper Shutdown in Code: Implement finalizers in your Prefect tasks that can handle cleanup operations for the ECS task. Utilize Prefect's state handlers to execute specific actions depending on the outcome of the task.
If you continue to experience issues, consider leveraging Prefect's community channels or further exploring the configuration options available in the Prefect documentation or AWS ECS guides.