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elb-unused.py
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elb-unused.py
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import boto3
import argparse
from datetime import datetime, timedelta
def get_all_regions(profile):
session = boto3.Session(profile_name=profile, region_name='us-east-1') # default region
ec2_client = session.client('ec2')
regions = [region['RegionName'] for region in ec2_client.describe_regions()['Regions']]
return regions
def get_account_info(profile):
session = boto3.Session(profile_name=profile, region_name='us-east-1') # default region
sts_client = session.client('sts')
iam_client = session.client('iam')
account_id = sts_client.get_caller_identity()['Account']
account_aliases = iam_client.list_account_aliases()['AccountAliases']
account_alias = account_aliases[0] if account_aliases else 'No alias'
return account_id, account_alias
def get_unused_elbs(profile, region):
session = boto3.Session(profile_name=profile, region_name=region)
elbv2_client = session.client('elbv2')
cloudwatch_client = session.client('cloudwatch')
all_elbs = elbv2_client.describe_load_balancers()['LoadBalancers']
unused_elbs = []
for elb in all_elbs:
response = cloudwatch_client.get_metric_statistics(
Namespace='AWS/ApplicationELB',
MetricName='RequestCount',
Dimensions=[
{
'Name': 'LoadBalancer',
'Value': elb['LoadBalancerName']
},
],
StartTime=datetime.utcnow() - timedelta(days=7),
EndTime=datetime.utcnow(),
Period=3600,
Statistics=['Sum'],
)
if not response['Datapoints']:
unused_elbs.append(elb)
return unused_elbs
def main():
parser = argparse.ArgumentParser(description='Find unused ELBs.')
parser.add_argument('--profile', required=True, help='AWS profile to use')
args = parser.parse_args()
account_id, account_alias = get_account_info(args.profile)
print(f'Account ID: {account_id}, Account Alias: {account_alias}\n')
regions = get_all_regions(args.profile)
all_unused_elbs = {}
for region in regions:
unused_elbs = get_unused_elbs(args.profile, region)
all_unused_elbs[region] = unused_elbs
for region, unused_elbs in all_unused_elbs.items():
print(f'Region: {region} ({len(unused_elbs)} unused ELBs)')
for elb in unused_elbs:
print(f' Load Balancer ARN: {elb["LoadBalancerArn"]}, Name: {elb["LoadBalancerName"]}')
if __name__ == '__main__':
main()