@Marvin How do I specify the architecture to use for ECS tasks created by ECS workers?

To specify the architecture for ECS tasks created by ECS workers in Prefect, you will need to define the architecture within the ECS task definition. This is typically done using AWS CLI or the AWS Management Console when you register your task definition. The architecture can be specified under the container definitions within the task definition JSON or YAML file. For more detailed guidance on setting up ECS tasks with Prefect, refer to the ECS Worker Guide. This guide provides comprehensive instructions on how to register task definitions and configure ECS workers for running Prefect flows. If you have specific requirements or configurations, such as choosing between AWS Fargate or Amazon EC2, make sure to adjust your task definition accordingly.

@Marvin How do I get flow runs to spawn ECS tasks that use ARM64 as the CPU architecture?

To configure ECS tasks to use ARM64 as the CPU architecture for Prefect flow runs, you will need to specify the architecture in the ECS task definition. This can be done by setting the

runtimePlatform

parameter in your task definition. Here’s a general approach: 1. Create or Update ECS Task Definition: When defining your ECS task, specify the ARM64 architecture. This can be done by including the

runtimePlatform

attribute in your task definition JSON or YAML file like so:

json
   {
     "family": "your-task-family",
     "containerDefinitions": [
       {
         "name": "your-container-name",
         "image": "your-image",
         ...
       }
     ],
     "runtimePlatform": {
       "cpuArchitecture": "ARM64"
     }
   }

2. Register the Task Definition: Use the AWS CLI or Management Console to register this task definition. 3. Deploy Prefect Flow: Ensure your Prefect flow is scheduled to run in an ECS work pool. This setup will allow the ECS worker to poll the work pool and execute the flow run using the specified task definition. For detailed steps on setting up ECS tasks with Prefect, refer to the ECS Worker Guide. This guide provides comprehensive instructions on managing ECS tasks and Prefect flows.

I don't want to do this manually, I want the ECS worker to set the runtimePlatform parameters when when registering now task definitions.

The Prefect ECS worker does not automatically set the

runtimePlatform

parameter when creating new task definitions. To achieve this, you would need to manually specify the

runtimePlatform

parameter when defining your task definitions through the AWS CLI or the AWS Management Console. Here's a general approach you can take: 1. Manually Define Task Definition: Create a task definition with the

runtimePlatform

parameter set to ARM64. This is done outside of Prefect, using AWS CLI or the Management Console. 2. Use Custom Task Definition: When deploying a Prefect flow, ensure it references the custom task definition that includes the ARM64 configuration. 3. Automate Task Definition Registration: If you need to automate this process, consider writing a script that registers task definitions with the desired configuration using AWS CLI commands. You can then integrate this script into your deployment pipeline or Prefect flow setup process. For more details on configuring ECS tasks with Prefect, refer to the ECS Worker Guide.

@Richard Sundqvist I have just tried upgrading our staging infrastructure from Prefect 2 to Prefect 3 and also have stumbled on this issue. I can't find any configuration as a job variable to set the platform architecture. Did you get any luck?

@Mohammed Siddiqui We're still on prefect 2, but the solution might be the same. Basically:

from prefect_aws import ECSWorker
from prefect import get_client

template = ECSWorker.get_default_base_job_template()
template["job_configuration"]["task_definition"]["runtimePlatform"] = {
  "cpuArchitecture": "ARM64",
  "operatingSystemFamily": "LINUX",
}

work_pool_update = WorkPoolUpdate(base_job_template=template)
await get_client().update_work_pool("ecs-work-pool", work_pool_update)

Hope this helps.

aah that might work, thanks I'll give it a try!