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Multi-Region Resilience: Failover, Data, and DNS

KU

Kiril urbonas

4 months ago • 1 min read•Updated Mar 24, 2026•6 views

Design for region failure. Active/passive and active/active, data replication, and failover testing.

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Multi-Region Resilience: Failover, Data, and DNS Patterns Data DNS and Traffic Best Practices

Multi-Region Resilience: Failover, Data, and DNS

Single-region risk is high. Multi-region design improves availability and disaster recovery.

Patterns #

Active/passive: One primary region; failover to secondary on failure. RTO/RPO depend on replication and DNS.
Active/active: Traffic in multiple regions; better latency and availability, harder data consistency.

Data #

Replication: Async for RPO tolerance; sync for strong consistency (with latency tradeoff).
Conflict resolution: Last-write-wins or application-defined; test conflict scenarios.

DNS and Traffic #

Route53 / global load balancers: Health checks and failover or weighted routing.
TTL: Lower TTL before failover to reduce propagation delay; balance with DNS load.

Best Practices #

Run failover drills regularly; automate where possible.
Document RTO/RPO and runbooks; align with business.
Monitor replication lag and health in both regions.

Multi-region adds cost and complexity; start with critical paths and expand.

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KU

About Kiril urbonas

DevOps Engineer and AI Enthusiast

256 articles

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