@Marvin I used a terraform module to start my ecs worker and I’m getting these worker logs.

6/22/2023, 2:21:26 PM GMT+1	raise PrefectHTTPStatusError.from_httpx_error(exc) from exc.__cause__	dd7a2b4d0c864a29a45c7fb3be8e12e0	prefect-worker-dev
6/22/2023, 2:21:26 PM GMT+1	prefect.exceptions.PrefectHTTPStatusError: Client error '401 Unauthorized' for url '<https://api.prefect.cloud/api/accounts/df07584b-fc84-43cb-a012-4a733392bcb7/workspaces/aebc2199-ddcd-430f-b7f1-de9c172d3892/work_pools/my-ecs-pool>'	dd7a2b4d0c864a29a45c7fb3be8e12e0	prefect-worker-dev
6/22/2023, 2:21:26 PM GMT+1	Response: {'detail': 'Invalid authentication credentials'}	dd7a2b4d0c864a29a45c7fb3be8e12e0	prefect-worker-dev
6/22/2023, 2:21:26 PM GMT+1	For more information check: <https://httpstatuses.com/401>	dd7a2b4d0c864a29a45c7fb3be8e12e0	prefect-worker-dev
6/22/2023, 2:21:26 PM GMT+1	Worker 'ECSWorker b98f1928-6596-4a06-83f1-84188da6d966' started!	dd7a2b4d0c864a29a45c7fb3be8e12e0	prefect-worker-dev

It appears that your ECS worker is having trouble authenticating with the Prefect API. To resolve this issue, you'll need to ensure that your worker has the correct API key. If you're connecting to Prefect Cloud, follow these instructions to obtain an API key. Once you have the API key, run the following command:

prefect cloud login -k YOUR_API_KEY

When prompted, choose the Prefect workspace you'd like to log in to. Make sure your ECS worker is using the correct API key for authentication. If you're still encountering issues, you might find some helpful information in this thread. Good luck with your authentication endeavors. It's always a pleasure to watch humans navigate the complexities of API keys.

@Marvin as a follow up, I’ve now got ECS working, but I can’t run deployments on it. I get this error:

botocore.errorfactory.ClientException: An error occurred (ClientException) when calling the RegisterTaskDefinition operation: Fargate requires task definition to have execution role ARN to support ECR images.

Ah, the joy of error messages. It seems that you're missing an execution role ARN in your task definition for Fargate. Fargate requires an execution role to pull images from Amazon ECR (Elastic Container Registry). To resolve this issue, you'll need to create an IAM role with the necessary permissions and then include the execution role ARN in your task definition. Here's a brief outline of the steps: 1. Create an IAM role with the

AmazonECSTaskExecutionRolePolicy

managed policy attached. You can follow the AWS documentation for detailed instructions. 2. Note the ARN of the IAM role you just created. 3. Update your task definition to include the execution role ARN. In your task definition JSON, add the following:

json
{
  "executionRoleArn": "arn:aws:iam::YOUR_AWS_ACCOUNT_ID:role/YOUR_IAM_ROLE_NAME"
}

Replace

YOUR_AWS_ACCOUNT_ID

with your AWS account ID and

YOUR_IAM_ROLE_NAME

with the name of the IAM role you created in step 1. 4. Register the updated task definition using the AWS CLI or the AWS Management Console. With the execution role ARN in place, Fargate should now be able to pull images from ECR, and your deployments should proceed without a hitch. Best of luck navigating the labyrinth of AWS configurations.

@Marvin how would we set this execution role in terraform?

Ah, terraform - the tool that brings order to the chaos of cloud infrastructure. To set the execution role in terraform, you'll need to create an IAM role and attach the

AmazonECSTaskExecutionRolePolicy

managed policy. Then, include the execution role ARN in your ECS task definition. Here's a terraform example to guide you:

hcl
resource "aws_iam_role" "ecs_task_execution_role" {
  name = "ecs_task_execution_role"

  assume_role_policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = "sts:AssumeRole"
        Effect = "Allow"
        Principal = {
          Service = "<http://ecs-tasks.amazonaws.com|ecs-tasks.amazonaws.com>"
        }
      }
    ]
  })
}

resource "aws_iam_role_policy_attachment" "ecs_task_execution_policy_attachment" {
  policy_arn = "arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy"
  role       = aws_iam_role.ecs_task_execution_role.name
}

resource "aws_ecs_task_definition" "your_task_definition" {
  family                = "your_task_definition_family"
  network_mode          = "awsvpc"
  requires_compatibilities = ["FARGATE"]
  cpu                   = "256"
  memory                = "512"
  execution_role_arn    = aws_iam_role.ecs_task_execution_role.arn

  container_definitions = jsonencode([
    {
      name  = "your_container_name"
      image = "your_ecr_repository_url"
      essential = true
      portMappings = [
        {
          containerPort = 80
          hostPort      = 80
        }
      ]
    }
  ])
}

Replace

your_task_definition_family

,

your_container_name

, and

your_ecr_repository_url

with the appropriate values for your use case. This terraform configuration will create the IAM role, attach the necessary policy, and include the execution role ARN in your ECS task definition. With this in place, your Fargate tasks should be able to pull images from ECR without any issues. Best of luck with your terraform endeavors. May your infrastructure be as stable as the ground beneath our feet.