MultiCloud Classroom notes 12/mar/2026

Serverless Compute:

• Serverless compute enables running code or containers without managing servers. The cloud provider automatically handles infrastructure provisioning, scaling, patching, and availability.

• Developers focus only on application logic, while the platform manages the backend infrastructure.

Max execution time limits 15 min

Common integrations include:

• Amazon API Gateway:

  • restapi: 30 sec
  • http
  • webscoket api

• Amazon S3:

  • upload files…events

• Amazon DynamoDB:

  • event

• Amazon EventBridge:

  • based metrix
  • trigger cron

• Pricing Model

Lambda pricing is based on:

• Number of requests

• Execution duration

• Memory allocation (GB-seconds)

• Additional costs may include:

• Provisioned concurrency

please follow class recording and create lambda and layers

Lambda sample code to start/stop ec2 insatnce

import boto3

def lambda_handler(event, context):
    ec2 = boto3.client('ec2')

    tag_key = event.get('tag_key', 'Schedule')
    tag_value = event.get('tag_value', 'StartStop')
    action = event.get('action')

    response = ec2.describe_instances(
        Filters=[{'Name': f'tag:{tag_key}', 'Values': [tag_value]}]
    )

    results = []

    for reservation in response['Reservations']:
        for instance in reservation['Instances']:
            instance_id = instance['InstanceId']
            state = instance['State']['Name']

            if action == 'start' and state == 'stopped':
                ec2.start_instances(InstanceIds=[instance_id])
                results.append(f"Started {instance_id}")

            elif action == 'stop' and state == 'running':
                ec2.stop_instances(InstanceIds=[instance_id])
                results.append(f"Stopped {instance_id}")

            else:
                results.append(f"Instance {instance_id} is already {state}")

    # ✅ Return a structured response
    return {
        "statusCode": 200,
        "body": {
            "action": action,
            "tag_key": tag_key,
            "tag_value": tag_value,
            "results": results
        }
    }

payload to trigger lambda

{
  "action": "start",
  "tag_key": "Environment",
  "tag_value": "dev"
}