Orphaned CloudFormation Stacks — HouseKeeping

#aws #cloudformation #housekeeping #cost

Scenario

There could be some stacks missed out during teardown process due to some issues and this might leave those stacks orphaned.
Also when App teams create a new stack without deleting their previous stack, this will leave the previous stack orphaned.

Solution

List out all the stacks based on the state in the corresponding account using below python script. Filter the suspecting orphaned stacks from the list.

# Function: EvaluateOrphanedStacks
# Purpose: List out stacks based on the state and accounts
import boto3
import json
from datetime import datetime
from datetime import date
cfn_client=boto3.client('cloudformation')
def list_stacks():
paginator = cfn_client.get_paginator('list_stacks')
response_iterator = paginator.paginate(
StackStatusFilter=[
'CREATE_IN_PROGRESS',
'CREATE_FAILED',
'CREATE_COMPLETE',
'ROLLBACK_IN_PROGRESS',
'ROLLBACK_FAILED',
'ROLLBACK_COMPLETE',
'DELETE_IN_PROGRESS',
'DELETE_FAILED',
'UPDATE_IN_PROGRESS',
'UPDATE_COMPLETE_CLEANUP_IN_PROGRESS',
'UPDATE_COMPLETE',
'UPDATE_ROLLBACK_IN_PROGRESS',
'UPDATE_ROLLBACK_FAILED',
'UPDATE_ROLLBACK_COMPLETE_CLEANUP_IN_PROGRESS',
'UPDATE_ROLLBACK_COMPLETE',
'REVIEW_IN_PROGRESS',
'IMPORT_IN_PROGRESS',
'IMPORT_COMPLETE',
'IMPORT_ROLLBACK_IN_PROGRESS',
'IMPORT_ROLLBACK_FAILED',
'IMPORT_ROLLBACK_COMPLETE'
]
)
for page in response_iterator:
for stack in page['StackSummaries']:
print(stack['StackName'])
if __name__ == '__main__':
list_stacks()

Note:
Its ALWAYS recommended and good practice to reduce the orphaned stacks and unwanted resources !