System Design

Disaster Recovery with DNS Failover

System Design diagram · made in Skemio

Disaster recovery failover architecture showing Route 53 monitoring Region A, detecting failure, rerouting users to Region B, and promoting its standby database.
Disaster recovery failover architecture showing Route 53 monitoring Region A, detecting failure, rerouting users to Region B, and promoting its standby database.
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What it shows

  • Global DNS health probes detect outages within seconds using active polling.
  • DNS records switch traffic to standby region with low TTL (30-60s) records.
  • Asynchronous cross-region read replicas promote to writable primary status.

The takeaway

Automate health-driven DNS rerouting and replica promotion before an outage strikes.

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