AWS Lambda: start EC2 instances

lambda_function.py

import boto3

region = 'eu-west-3'
ec2 = boto3.client('ec2', region_name=region)

def lambda_handler(event, context):
    instances = event['instances']
    ec2.start_instances(InstanceIds=instances)

policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "logs:CreateLogGroup",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": "arn:aws:logs:*:*:*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "ec2:Start*",
                "ec2:Stop*"
            ],
            "Resource": "*"
        }
    ]
}

To be called with the following params:

{"instances":["i-0123456789abcdef"]}

Replace start_instances with stop_instances to stop the EC2 instances.