Ref: https://learn.cantrill.io/courses/1820301/lectures/41301584

• Summary:
• Contents:

R53 Failover Routing - Architecture

Diagram: https://github.com/acantril/aws-sa-associate-saac03/blob/main/1200-ROUTE53/00_LEARNINGAIDS/Route53FailoverRouting-1.png

• 🔧 The same host name has two records: a primary and a secondary record
  • Each record points to a different AWS resource
  • Health check in place:
    • If primary resource is healthy → primary record is returned to queries
    • If primary resource is unhealthy → secondary record is returned to queries
• Useful for configuring active-passive failover
  • i.e. route traffic to a resource if healthy, to a different resource if primary is unhealthy
  • Common scenario: failover to an out-of-band failure/maintenance page
    • e.g. EC2 as primary resource + S3 static website as secondary/backup resource