How to Reduce Your Dependence on a Single AWS Region's Control Plane

Retrospective: this article looks back at events from October 2025, written in 2026 with the benefit of hindsight.

Many AWS workloads depend on US-EAST-1 more than their owners realize. Here is how to reduce dependence on a single region's control plane.

Step 1: Map dependencies

For each critical workload, document:

• Which region(s) it runs in.
• AWS services it depends on (including DynamoDB, SQS, IAM Identity Center, Route 53 control plane, CloudFront configuration, ACM).
• Third-party SaaS services it depends on, and where they run.
• Any global features with control planes in US-EAST-1.

Step 2: Separate data plane from control plane

During regional disruptions, control-plane operations (creating, updating or deleting resources) are often impaired before data-plane operations (serving requests). Design so that steady-state operation doesn't require control-plane calls:

• Pre-provision capacity instead of relying on auto scaling during incidents.
• Avoid deployment-time dependencies during failover.
• Use Route 53 data-plane health checks and failover routing rather than making DNS changes during an incident.
• Use Route 53 Application Recovery Controller for controlled failover.

Step 3: Replicate what you need in a second region

• Data: DynamoDB global tables, Aurora Global Database, S3 replication.
• Configuration and secrets: replicate Secrets Manager secrets and KMS multi-Region keys.
• Identity: IAM Identity Center now supports more resilience options; check current multi-Region capabilities and have break-glass IAM access that doesn't depend on a single region.

Step 4: Consider moving primary workloads

If US-EAST-1 isn't required for latency or service availability, consider another primary region.

Step 5: Test

Run game days simulating loss of US-EAST-1 dependencies.