A simple python script to check all the services running on a fargate cluster to see if any are need to be upgraded before the March 2026 deadline: https://docs.aws.amazon.com/AmazonECS/latest/developerguide/platform-version-migration.html

fargate-services-needing-update.py

import boto3
import sys

ecs_client = boto3.client('ecs')

def chunker(seq, size):
    for pos in range(0, len(seq), size):
        yield seq[pos:pos + size]

def main():
    if len(sys.argv) != 2:
        print("Usage: python script.py <cluster_name>")
        sys.exit(1)

    cluster_name = sys.argv[1]

    paginator = ecs_client.get_paginator('list_services')
    service_arns = []

    # Paginate through all services in the cluster
    for page in paginator.paginate(cluster=cluster_name):
        service_arns.extend(page['serviceArns'])

    total_mismatched = 0

    for service_arn in service_arns:
        service_name = service_arn.split('/')[-1]

        # List running tasks for the service
        task_arns = ecs_client.list_tasks(cluster=cluster_name, serviceName=service_name, desiredStatus='RUNNING')['taskArns']

        if not task_arns:
            print(f"{service_name}: No running tasks")
            continue

        mismatched_count = 0
        for task_chunk in chunker(task_arns, 100):
            response = ecs_client.describe_tasks(cluster=cluster_name, tasks=task_chunk)
            for task in response['tasks']:
                if task['platformVersion'] != '1.4.0':
                    mismatched_count += 1

        print(f"{service_name}: {mismatched_count} task(s) running with platform version != 1.4.0")
        total_mismatched += mismatched_count

    print(f"Total tasks running with non-1.4.0 platform version: {total_mismatched}")

if __name__ == "__main__":
    main()