How can you configure Amazon Route 53 to act as a failover mechanism in combination with AWS Auto Scaling and Elastic Load Balancing?
To configure Amazon Route 53 as a failover mechanism with AWS Auto Scaling and Elastic Load Balancing, follow these steps:
1. Create two ELB instances in separate Availability Zones (AZs) for redundancy.
2. Attach the respective target groups to each ELB instance, ensuring they are associated with the appropriate Auto Scaling group.
3. In Route 53, create a hosted zone for your domain name.
4. Add an Alias record set for each ELB instance, pointing to their respective DNS names.
5. Configure health checks for both ELB instances, monitoring their status and availability.
6. Set up routing policies: primary ELB uses “Failover” policy with “Evaluate Target Health” enabled; secondary ELB uses “Failover” policy with “Evaluate Target Health” disabled and designated as backup.
