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An organization is architecting a multi-region disaster recovery strategy for an externally accessible, mission-critical web application on Google Cloud. The architecture must satisfy the following business continuity requirements:
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StudyCertsus-east4 region.us-central1 region.How should you configure Cloud DNS and health checking to achieve automated cross-region failover and failback?
This solution implements automated cross-region failover and failback by pairing Cloud DNS Failover routing policies with Google Cloud distributed health checks targeting regional external Application Load Balancer forwarding rules.
DNS TTL + (Health Check Interval * Unhealthy Threshold). Setting the DNS record TTL to 30–60 seconds ensures client caches expire rapidly, redirecting user traffic to the healthy secondary region with minimal delay.This approach aligns with Google Cloud architectural best practices for cross-region disaster recovery, balancing swift failure detection against protection against transient flap errors.
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