Building a Cross-Region Disaster Recovery Architecture on AWS

Active–Passive DR Setup Between UAE and India

A UAE-based enterprise required a highly available, secure, and disaster-resilient infrastructure to host their containerized applications. Their primary objective was:

• Ensure business continuity

• Achieve regional fault tolerance

• Maintain low Recovery Time Objective (RTO)

• Protect critical workloads and databases

• Comply with enterprise-grade security standards

To address these needs, we designed and implemented a Cross-Region Disaster Recovery (DR) solution on AWS.

The solution follows an Active–Passive Disaster Recovery model:

• Primary Region: Middle East (UAE)

• DR Region: Hyderabad

Traffic routing is managed using:

• Amazon Route 53 (Active/Passive DNS routing)

• AWS WAF for web protection

Applications are deployed on:

• Amazon EKS (Container orchestration)

• Elastic Load Balancing (Application Load Balancer)

Containerized Application Layer

• EKS clusters deployed in both regions

• Private worker nodes

• Ingress-based routing

• Auto-scalable deployments

• Container images stored in Amazon ECR

Secure Networking Design

• Dedicated VPC in each region

• Public Subnets (ALB, NAT Gateway)

• Private Web Subnets (EKS)

• Private DB Subnets (Databases)

• NACLs and Route Tables configured for controlled traffic

• OpenVPN access for administrative connectivity

Database Layer

• Multi-AZ master–replica architecture

• Cross-region replication

• Database failover strategy

• Encrypted storage using KMS

Caching Layer

• Redis deployed in private subnet

• Reduces database load

• Improves performance and availability

DR Model: Active–Passive

• UAE region serves production traffic.

• Hyderabad region remains warm standby.

• Data replication enabled across regions.

• S3 cross-region replication configured.

• DNS failover automated using health checks.

In case of UAE region failure:

1. Route 53 detects health failure.

2. Traffic automatically switches to Hyderabad.

3. Applications scale up in DR region.

4. Databases promote replica to primary (if required).

Objective                                                 Target

RTO (Recovery Time Objective) 15–30 minutes

RPO (Recovery Point Objective) Near real-time (replication-based)

Security was implemented at multiple layers:

• WAF for application protection

• Private subnets for compute & DB

• AWS KMS encryption

• Amazon GuardDuty for threat monitoring

• AWS Inspector for vulnerability assessment

• AWS Secrets Manager for credential security

This ensures enterprise-grade protection and audit readiness.

High Availability

Eliminates single-region dependency.

Business Continuity

Ensures operations remain uninterrupted during regional outages.

Scalable Kubernetes Architecture

Auto-scaling EKS clusters handle dynamic workloads.

Cost-Optimized DR

Passive region maintains minimal active load and scales during failover.

Enterprise Security Controls

Multi-layered protection aligned with global best practices.

For enterprises operating in the Middle East, regional outages or connectivity disruptions can significantly impact revenue and reputation.

By deploying a cross-region Kubernetes-based DR solution, the customer achieved:

• Zero single point of failure

• Automated DNS failover

• Data durability

• Regulatory-ready security posture

This implementation demonstrates how organisations can:

• Build resilient cloud-native infrastructure

• Leverage AWS global regions for DR

• Protect containerized workloads

• Ensure high availability without excessive cost