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1#!/usr/bin/env python
2import boto3
3import sys
4
5def deregister_all_instances(elb_client, lbname):
6	client = elb_client
7	response = client.describe_load_balancers(
8					LoadBalancerNames=[
9			        	lbname
10			    	]
11				)
12	instances = response['LoadBalancerDescriptions'][0]['Instances']
13	import pprint
14	pprint.pprint(instances)
15
16	if len(instances) > 0:
17		client.deregister_instances_from_load_balancer(
18	    	LoadBalancerName=lbname,
19		    Instances=response['LoadBalancerDescriptions'][0]['Instances']
20	    )
21
22if __name__ == '__main__':
23	client = None
24	if len(sys.argv) >= 4:
25		access_key = sys.argv[2]
26		secret_key = sys.argv[3]
27
28		client = boto3.client('elb', aws_access_key_id=access_key, aws_secret_access_key=secret_key)
29	else:
30		client = boto3.client('elb')
31	deregister_all_instances(client, sys.argv[1])