Implement Global DNS with Route53 for Multi-Region EKS

[runatyr1]

Implement Global DNS with Route53 for Multi-Region EKS

Description

Add Route53 support to enable global DNS and intelligent routing between our multi-region EKS clusters. This will provide latency-based routing and automated failover capabilities between the primary (us-east-1) and secondary (us-west-2) regions.

Technical Requirements

• Implement new Route53 Terraform module
• Configure latency-based routing between regions
• Set up health checks for both regional endpoints
• Integrate with existing EKS infrastructure
• Add comprehensive testing script

Acceptance Criteria

• Route53 hosted zone is properly configured
• Health checks are implemented and monitoring both regional endpoints
• Latency-based routing policy is correctly configured
• DNS records for both regions are created with appropriate routing policies
• Automated failover works when primary region is unavailable
• New test script (5-test-route53.sh) validates all DNS functionality
• Documentation is updated with DNS configuration details
• Integration tests pass in both regions
• Terraform plan shows no unexpected changes
• Route53 module has proper variable validation and error handling

Additional Notes

• Consider using TCP health checks instead of HTTP for better reliability
• Ensure proper IAM permissions are in place for Route53 management
• Add monitoring and alerting for DNS health checks
• Consider DNS propagation considerations during deployment

Related Files

• infrastructure/aws-eks/terraform/modules/route53/*
• infrastructure/aws-eks/terraform/environments/staging/main.tf
• infrastructure/aws-eks/scripts/5-test-route53.sh