Resilient Architectures - Multi-region applications

Question 1

How to achieve active-active redundancy

Answer 1

• By using Weighted Resource Records on a Route 53 hosted zone

Question 2

Active-passive redundancy - Failover Resource Records strategies

Answer 2

• Pilot light: secondary region runs minimal amount of resources to keep costs down
• Warm standby: secondary region has roughly the same capacity as the primary region

Question 3

Active-passive redundancy - Failover Resource Records with Route 53 Health checks

Answer 3

• Every resource record resolves to the public IP address of an instance, so the ELB is not needed. In this case Route 53 will be a DNS LB