packer-cleanup-serverless

.npmignore

# Distribution / packaging
.Python
env/
build/
develop-eggs/
dist/
downloads/
eggs/
.eggs/
lib/
lib64/
parts/
sdist/
var/
*.egg-info/
.installed.cfg
*.egg

# Serverless directories
.serverless

README.md

snapshot-cleanup

Install node.js/npm if you haven't already, as serverless framework is a node package:

brew install node

Install serverless framework:

npm install -g serverless

Configure credentials:

serverless config credentials --provider aws --key ***<REDACTED>*** --secret ***<REDACTED>***

Invocation locally, while developing:

serverless invoke local -f packersnapshotcleanup --path event-mock.json

Deploy & test:

serverless deploy function -f packersnapshotcleanup && sls invoke -f packersnapshotcleanup --path event-mock.json

event-mock.json

[
	{
		"Time": "00-00-00T00:00:00Z",
		"Source": "my-custom-source",
		"Resources": ["my-custom-resources"],
		"DetailType": "my-custom-detail",
		"Detail": "{ \"key\": \"value\"}"
	}
]

handler.py

import json, boto3, botocore

def snapshot_cleanup(event, context):

    ec2 = boto3.resource('ec2')

    snapshots = ec2.snapshots.filter(Filters=[
        {
            'Name': 'tag:Name',
            'Values': [
                'something-images-are-named-*',
                'something-else-images-are-named-*'
            ]
        }
    ])

    all_ids     = []
    deleted_ids = []

    for snapshot in snapshots:
        all_ids.append(snapshot.id)
        try:
            snapshot.delete(SnapshotId=snapshot.id)
            deleted_ids.append(snapshot.id)
        except botocore.exceptions.ClientError as ex:
            print(f'Deletion for snapshot {snapshot.id} failed. Exception: {ex}')
            continue
        except Exception as ex:
            print(f'Something went wrong while trying to delete snapshot {snapshot.id}. Exception: {ex}')
            continue

    return {
        "all_snapshots": all_ids,
        "snapshots_deleted": deleted_ids,
        "event": event
    }

put-events.sh

# Call this where you want to trigger the process.

function put_events() {

  local DATE_NOW=$(date +%Y-%m-%dT%H:%M:%SZ)

  aws events \
    put-events \
    --entries '[{"Time": "'${DATE_NOW}'", "Source": "my-custom-source", "Resources": ["my-custom-resources"], "DetailType": "my-custom-detail", "Detail": "{ \"key\": \"value\"}"}]'

  return $?

}

put_events

serverless.yaml

service: packersnapshotcleanup
frameworkVersion: '2'

provider:
  name: aws
  runtime: python3.8
  lambdaHashingVersion: 20201221
  timeout: 10
  region: eu-west-2
  stage: dev

  iamRoleStatements:
    - Effect: "Allow"
      Action:
      - ec2:DeleteSnapshot
      - ec2:DescribeVolumes
      - ec2:DescribeSnapshots
      Resource: "*"

functions:
  packersnapshotcleanup:
    handler: handler.snapshot_cleanup
    events:
      - cloudwatchEvent:
         event:
           source:
             - "my-custom-source"
           detail-type:
             - "my-custom-detail"
           detail:
             key:
               - value