Question

A company runs a customer-facing web application with its primary deployment in us-east-1 behind an Application Load Balancer. To meet a disaster recovery requirement, they deployed an identical standby stack in us-west-2, also behind an ALB, that is kept warm but should only receive traffic if the primary Region becomes unavailable. Users access the site via app.example.com, an alias to the primary ALB. Which Route 53 configuration will automatically direct users to the us-west-2 stack only when the primary Region is unhealthy?

Accepted Answer

Create two failover records for app.example.com: a Primary record aliased to the us-east-1 ALB with an associated health check, and a Secondary record aliased to the us-west-2 ALB.

Answer

Create two weighted records for app.example.com with weights of 100 for us-east-1 and 0 for us-west-2, and attach a health check to the us-east-1 record.

Answer

Create two latency-based records for app.example.com pointing to each ALB so Route 53 routes users to the lowest-latency healthy Region.

Answer

Create a multivalue answer record set returning both ALB endpoints, each with an associated health check, so clients fail over automatically.