Getting a list of instances in an EC2 auto scale group?

Question

Is there a utility or script available to retrieve a list of all instances from AWS EC2 auto scale group?

I need a dynamically generated list of production instance

Answer 1

Use the below snippet for sorting out ASGs with specific tags and listing out its instance details.

#!/usr/bin/python

import boto3

ec2 = boto3.resource('ec2', region_name='us-west-2')

def get_instances():
        client = boto3.client('autoscaling', region_name='us-west-2')
        paginator = client.get_paginator('describe_auto_scaling_groups')
        groups = paginator.paginate(PaginationConfig={'PageSize': 100})
        #print groups
        filtered_asgs = groups.search('AutoScalingGroups[] | [?contains(Tags[?Key==`{}`].Value, `{}`)]'.format('Application', 'CCP'))

        for asg in filtered_asgs:
                print asg['AutoScalingGroupName']
                instance_ids = [i for i in asg['Instances']]
                running_instances = ec2.instances.filter(Filters=[{}])
                for instance in running_instances:
                        print(instance.private_ip_address)

if __name__ == '__main__':
    get_instances()