Lists AWS ELBs with no valid endpoints

find_invalid_elbs.py

import boto.ec2.elb


def get_elbs_with_no_valid_instances(elb):
    """Finds ELBs with zero instances or where all instances are no longer in service."""
    for lb in elb.get_all_load_balancers():
        instances = lb.get_instance_health()
        if len(instances) == 0:
            yield lb
            continue
        if all([instanceState.state == 'OutOfService' for instanceState in instances]):
            yield lb
            continue


def main():
    for region in boto.ec2.elb.regions():
        elb = boto.ec2.elb.connect_to_region(region.name)
        try:
            elbs = list(get_elbs_with_no_valid_instances(elb))
        except boto.exception.BotoServerError as err:
            continue
        if not elbs:
            continue
        print "%s:" % region.name
        for lb in sorted(elbs, key=lambda lb: lb.name.lower()):
            print "\t%s" % lb.name



if __name__ == "__main__":
    main()