start_ec2.py

import json
#!/usr/bin/env python3.11

# this script will start ec2 instances based off of tags 

import boto3
import sys
import os

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

    regions = [region['RegionName']
               for region in ec2.describe_regions()['Regions']] 
    
    # start instances in us-east-1 with Key labeled 'tag' and Value labeled 'swarm_node'
    filters = [{
                'Name': 'tag:swarm_node',
                'Values': ['true']
            }
        ]
    for region in regions:
        ec2 = boto3.resource('ec2', region_name=region)
        instances = ec2.instances.filter(Filters=filters)
        for instance in instances:
            instance.start()
            print(f"started instance: {instance.id} in {region}")

    
    
    
    return {
        'statusCode': 200,
        'body': json.dumps('Hello from Lambda!')
    }