Find a ElasticLoadBalancer (ELB) by its ip address

find_elb_by_ip.py

import boto3
import socket
import argparse

client = boto3.client('elb')


def find_elb_by_ip(ip):
    paginator = client.get_paginator('describe_load_balancers')
    response_iterator = paginator.paginate()

    for response in response_iterator:
        for lb in response['LoadBalancerDescriptions']:
            ips = socket.gethostbyname_ex(lb['DNSName'])
            if ip in ips[2]:
                print(lb['DNSName'])
                break


def main():
    parser = argparse.ArgumentParser(description='Process some integers.')
    parser.add_argument('ip', help='The ELBs ip')
    args = parser.parse_args()
    find_elb_by_ip(args.ip)


main()