os-patcher.py

import boto3

def lambda_handler(event, context):
     
     print("Instance ID") 
     print("---------------")
     print(event["detail"]["resources"][0]["id"])
     print("---------------")
     
     ssm = boto3.client('ssm')
     # specify the name or ARN of the automation document
     document_name = 'AWS-PatchAsgInstance'
     # specify the parameters for the automation document
     parameters = {
        'InstanceId': [event["detail"]["resources"][0]["id"]],
        'WaitForReboot' : ['PT5M'],
        'WaitForInstance' : ['PT2M']
     }
     # execute the automation document
     response = ssm.start_automation_execution(
        DocumentName=document_name,
        Parameters=parameters
     )