Stop Paying for Idle AWS ECS Services: Automate Start/Stop Scheduling

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Paying for idle AWS Elastic Container Service (ECS) resources is a waste of money. Fortunately, you can automate the shutdown of unused services using AWS serverless components like EventBridge and Lambda.

How It Works

AWS EventBridge Scheduler triggers actions on a schedule, while Lambda executes business logic to stop or start ECS services. By combining these services, you can automate resource management efficiently.

You Should Know: AWS Automation Steps

1. Set Up EventBridge Rule

Create an EventBridge rule to trigger Lambda on a schedule (e.g., non-working hours). 

aws events put-rule --name "StopECSServicesAtNight" --schedule-expression "cron(0 20   ? )"

2. Create Lambda Function

Write a Lambda function (Python) to stop ECS services: 

import boto3

def lambda_handler(event, context):
ecs = boto3.client('ecs')
response = ecs.update_service(
cluster='your-cluster-name',
service='your-service-name',
desiredCount=0  Stops all tasks
)
return response

3. Add Permissions

Ensure Lambda has the required IAM permissions:

{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"ecs:UpdateService",
"ecs:DescribeServices"
],
"Resource": ""
}
]
}

4. Trigger Lambda via EventBridge

Link the EventBridge rule to Lambda:

aws events put-targets --rule "StopECSServicesAtNight" --targets "Id"="1","Arn"="your-lambda-arn"

5. (Optional) Use SNS for Notifications

Configure SNS to alert when scaling actions occur:

aws sns create-topic --name "ECS-Scaling-Alerts"
aws sns subscribe --topic-arn "your-sns-topic-arn" --protocol "email" --notification-endpoint "[email protected]"

What Undercode Say

Automating AWS ECS scaling with EventBridge and Lambda ensures cost efficiency. Below are additional useful commands for managing AWS resources:

Linux/Cloud Commands

  • List running ECS tasks: 
    aws ecs list-tasks --cluster your-cluster --service your-service
  • Force-stop a task: 
    aws ecs stop-task --cluster your-cluster --task your-task-id
  • Check CloudWatch logs for Lambda: 
    aws logs get-log-events --log-group-name "/aws/lambda/your-lambda" --log-stream-name "latest"

Windows AWS CLI Setup

  • Install AWS CLI on Windows: 
    msiexec.exe /i https://awscli.amazonaws.com/AWSCLIV2.msi
  • Configure AWS credentials: 
    aws configure

Prediction

As cloud costs rise, more organizations will adopt automated scaling solutions. Serverless architectures will dominate cost optimization strategies in AWS, Azure, and GCP.

Expected Output:

  • Idle ECS services stopped automatically.
  • Cost savings reflected in AWS billing reports.
  • Notifications via SNS for scaling events.

Read the full guide here.

References:

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