Scale down all services in a ECS cluster.

scaler.py

#!/usr/bin/python
# -*- coding: utf-8 -*-
import boto3
from pprint import pprint

ecs_cluster = 'my_cluster_mame'

client = boto3.client('ecs', region_name='us-east-1')


def list_services(cluster):
    response = client.list_services(cluster=cluster, maxResults=100,
                                    launchType='EC2',
                                    schedulingStrategy='REPLICA')
    return [service for service in response['serviceArns']]


def desc_service(services):
    return client.describe_services(cluster=ecs_cluster,
                                    services=services)


def gen(service):
    return {'name': service['serviceName'],
            'desired_count': service['desiredCount']}


def update_service(service_name, desired_count):
    client.update_service(cluster=ecs_cluster,
                          service=service['serviceName'],
                          desiredCount=desired_count)


services = list_services(ecs_cluster)
service_info = desc_service(services)
current_state = [gen(service) for service in service_info['services']]
for service in service_info['services']:
    update_service(service, 0)
pprint(current_state)