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

On this page

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.

Multi-Region Resilience: Failover, Data, and DNS

Multi-Region Resilience: Failover, Data, and DNS

Patterns #

Data #

DNS and Traffic #

Best Practices #

Stay Updated

Real-World RAG Incidents: Lessons from a Production Rollout

Architecture Review: Infrastructure Documentation as Code

More from Cloud

Secrets Management in Practice: From .env Files to Vault

AWS Cost Audit: 7 Things We Found Wasting Money Every Month

RDS Restore Drills for Busy Teams: The Recovery Workflow That Surfaced Real Gaps

Secrets Management in Practice: From .env Files to Vault

AWS Cost Audit: 7 Things We Found Wasting Money Every Month

RDS Restore Drills for Busy Teams: The Recovery Workflow That Surfaced Real Gaps

Multi-Cluster Traffic Routing Strategies: A Pragmatic Rollout Pattern for Growing SaaS Teams

Monitoring That Actually Helps On-Call: Alerts, Dashboards, and Runbooks

Incident Postmortems That Actually Prevent Repeat Failures

About Kiril urbonas

Multi-Region Resilience: Failover, Data, and DNS

Patterns#

Data#

DNS and Traffic#

Best Practices#

Stay Updated

Real-World RAG Incidents: Lessons from a Production Rollout

Architecture Review: Infrastructure Documentation as Code

More from Cloud

Secrets Management in Practice: From .env Files to Vault

AWS Cost Audit: 7 Things We Found Wasting Money Every Month

RDS Restore Drills for Busy Teams: The Recovery Workflow That Surfaced Real Gaps

About Kiril urbonas

Patterns #

Data #

DNS and Traffic #

Best Practices #