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Multi-Region Resiliency for CloudFormation Custom Resources

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2026

This feature thread tracks the evolution of enabling robust multi-Region resiliency for AWS CloudFormation custom resource deployments. Initial focus is on addressing the inherent challenges of deploying custom resources across multiple AWS Regions, such as the lack of native fan-out mechanisms, duplicate execution risks, and the absence of distributed locking and automated failover. The proposed solution introduces an active-active architecture leveraging DynamoDB Global Tables for distributed locking and idempotency, and Amazon Application Recovery Controller for automated failover. This post details the architecture and walkthrough for implementing this active-active multi-Region solution.

2026

Building multi-Region resiliency for AWS CloudFormation custom resource deployment | Amazon Web Services

7/22/2026

This post introduces a detailed active-active multi-Region architecture for CloudFormation custom resources. It addresses challenges like no native fan-out, duplicate execution risk, lack of distributed locking, and no automated failover. The solution leverages DynamoDB Global Tables for distributed locking and idempotency, and Amazon Application Recovery Controller for automated failover. The walkthrough explains event initiation in customer regions, cross-region fan-out with SNS, primary and secondary Lambda handler logic with conditional writes and delayed processing, and the role of DynamoDB Global Tables in maintaining state and locks.