aws-unused-snapshots.py

#!/usr/bin/python3

import boto3

ec2res = boto3.resource('ec2')
ec2client = boto3.client('ec2')

region_name = ec2client.meta.region_name

snapshots = ec2res.snapshots.filter(OwnerIds=['self'])

snapshots_size_total = 0
snapshots_size_unused = 0
snapshots_count_total = 0
snapshots_count_unused = 0
for s in snapshots:
    # get ami for snapshot
    filters_ebs = [{"Name": "block-device-mapping.snapshot-id", "Values": [s.id]}]
    images_ebs = [i['ImageId'] for i in ec2client.describe_images(Filters=filters_ebs)["Images"]]
    snapshots_size_total += s.volume_size
    snapshots_count_total += 1
    if len(images_ebs) == 0:
        print(f'{region_name}: {s.id} ({s.volume_size} GiB, {s.start_time}, {s.description}) is not used by any image')
        snapshots_count_unused += 1
        snapshots_size_unused += s.volume_size

print(f'{region_name}: Found {snapshots_count_total} total snapshots ({snapshots_size_total} GiB)')
print(f'{region_name}: Found {snapshots_count_unused} unused snapshots ({snapshots_size_unused} GiB)')