How can I get the addresses of all the EC2 instances tied to a LoadBalancer using Boto?

boto

Solution

This is what I ended up with:

import boto
from boto import regioninfo
from boto import ec2

ACCESS_KEY_ID = '***********'
SECRET_ACCESS_KEY = '***********'

elb_region = boto.regioninfo.RegionInfo(
    name='ap-southeast-1', 
    endpoint='elasticloadbalancing.ap-southeast-1.amazonaws.com')

elb_connection = boto.connect_elb(
    aws_access_key_id=ACCESS_KEY_ID, 
    aws_secret_access_key=SECRET_ACCESS_KEY, 
    region=elb_region)

ec2_region = ec2.get_region(
    aws_access_key_id=ACCESS_KEY_ID,
    aws_secret_access_key=SECRET_ACCESS_KEY, 
    region_name='ap-southeast-1')

ec2_connection = boto.ec2.connection.EC2Connection(
    aws_access_key_id=ACCESS_KEY_ID, 
    aws_secret_access_key=SECRET_ACCESS_KEY,
    region=ec2_region)

load_balancer = elb_connection.get_all_load_balancers(load_balancer_names=['MediaPopClients'])[0]
instance_ids = [ instance.id for instance in load_balancer.instances ]
reservations = ec2_connection.get_all_instances(instance_ids)
instance_addresses = [ i.public_dns_name for r in reservations for i in r.instances ]

Gives:

[u'ec2-46-137-194-58.ap-southeast-1.compute.amazonaws.com']

Problem

Original source