Building multi-Region resiliency for AWS CloudFormation custom resource deployment
Architecture Blog
This article presents an active-active multi-Region architecture for deploying CloudFormation custom resources with high resilience and no duplicate processing.
- CloudFormation custom resources extend infrastructure-as-code capabilities but lack native multi-Region support
- Architecture uses DynamoDB Global Tables for distributed locking to prevent duplicate event processing across Regions
- Primary Region (us-east-1) processes events immediately; secondary Region (us-west-2) handles failover after a delay
- SNS cross-Region subscriptions fan out events simultaneously to SQS queues in both infrastructure Regions
- Amazon Application Recovery Controller detects regional failures and triggers automated failover without manual intervention
- Idempotency tracking ensures retries and failover scenarios don't cause duplicate side effects
This pattern eliminates single points of failure while preventing duplicate processing, providing a blueprint for resilient multi-Region custom resource deployments at scale.
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