lambda.py

gistfile1.txt

def imagesInASGs(region):
  amis = []
  autoscaling = boto3.client('autoscaling', region_name=region)
  print(f'Checking autoscaling groups in region {region}...')
  paginator = autoscaling.get_paginator('describe_auto_scaling_groups')

  page_iterator = paginator.paginate(
    PaginationConfig = {'PageSize': 10}
  )  
  filtered_asgs = page_iterator.search(f"AutoScalingGroups[*].[Instances[?LifecycleState == 'InService'].[InstanceId, LaunchTemplate.LaunchTemplateId,LaunchTemplate.Version]]")

  for key_data in filtered_asgs:
    matches = re.findall(r"'(.+?)'",str(key_data))
    instance_id = matches[0]
    template = matches[1]
    version = matches[2]
    print(f"Template found: {template} version {version}")

    if (template == ""):
      send_alert(f"AMI cleaner failure", f"Failed to find launch template that was used for instance {instance_id}")
      return

    ec2 = boto3.client('ec2', region_name = region)
    launch_template_versions = ec2.describe_launch_template_versions(
      LaunchTemplateId=template, 
      Versions=[version]
    );  
    used_ami_id = launch_template_versions["LaunchTemplateVersions"][0]["LaunchTemplateData"]["ImageId"]
    if not used_ami_id:
      send_alert(f"AMI cleaner failure", f"Failed to find AMI for launch template {template} version {version}")
      return    
    amis.append(used_ami_id)
  return amis