cfn-cur

A tool to generate AWS CLI command to continue-update-rollback a stack that is stuck in UPDATE_ROLLBACK_FAILED state. The resources to skip are essentially identified using a set of DescribeStackResources, DescribeStacks and DescribeStackEvents API Calls.

Works for stacks with nested stacks. Always pass the root stack ARN and the root stack must be in UPDATE_ROLLBACK_FAILED state. If your root stack is in a different state [ i.e, the nested stack was updated directly ], the stack is ideally in a stuck situation and would need AWS intervention to recover.

Features

• Automatically identifies resources that need to be skipped during continue-update-rollback
• Works with nested stacks
• Generates ready-to-use AWS CLI commands
• Handles complex stack hierarchies

Installation

pip install cfn-cur

Usage

cfn-cur <root-stack-arn>

How It Works

The tool analyzes the CloudFormation stack events to identify resources that failed during the update process. It then generates an AWS CLI command with the appropriate --resources-to-skip parameter to help you successfully roll back your stack.

Requirements

• Python 3.9 or higher
• AWS credentials configured in your CLI

License

This project is licensed under the MIT License - see the LICENSE file for details.