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Multi-Region Cloud Platform Architecture

Architected multi-region AWS/Azure platforms achieving 99.95% uptime with high availability and disaster recovery

AWSAzureKubernetesEKSAKSTerraformHigh Availability

Problem

The organization needed a highly available, scalable cloud platform that could support critical business operations across multiple regions. Key challenges included:

  • Single point of failure - existing infrastructure lacked redundancy
  • Regional compliance requirements - needed to serve customers in multiple geographic regions
  • Disaster recovery gaps - no automated failover capabilities
  • Scalability limitations - unable to handle traffic growth and regional expansion
  • High availability requirements - needed 99.95% uptime SLA

Solution Approach

I architected and implemented a multi-region cloud platform spanning AWS and Azure:

  1. Multi-region deployment - active-active configuration across AWS and Azure regions
  2. Kubernetes orchestration - EKS on AWS and AKS on Azure for consistent container management
  3. Terraform infrastructure as code - version-controlled, reproducible infrastructure
  4. Cross-region replication - automated data synchronization and failover
  5. Global load balancing - intelligent traffic routing based on latency and availability
  6. Automated disaster recovery - RTO < 5 minutes, RPO < 1 minute

Architecture

The multi-region architecture includes:

  • EKS clusters in AWS regions (us-east-1, eu-west-1) with multi-AZ node groups
  • AKS clusters in Azure regions (East US, West Europe) for redundancy
  • Cross-cloud networking - VPN and ExpressRoute connections between clouds
  • Database replication - RDS Multi-AZ and Azure SQL with geo-replication
  • Global Traffic Manager - DNS-based routing with health checks
  • Monitoring and alerting - unified observability across both clouds

Implementation Details

Multi-Region Setup

Implemented active-active configuration:

  • Primary regions: AWS us-east-1 and Azure East US
  • Secondary regions: AWS eu-west-1 and Azure West Europe
  • Synchronous replication for critical data
  • Asynchronous replication for non-critical workloads

Kubernetes Orchestration

Configured EKS and AKS clusters with:

  • Multi-AZ node groups for high availability within regions
  • Horizontal Pod Autoscaling based on CPU and custom metrics
  • Cluster Autoscaling to handle traffic spikes
  • Network policies for security isolation
  • Service mesh for inter-service communication

Disaster Recovery

Implemented automated failover:

  • Health checks every 30 seconds across all regions
  • Automatic DNS failover when primary region becomes unavailable
  • Data replication with minimal latency
  • Automated testing of DR procedures monthly

Infrastructure as Code

All infrastructure managed with Terraform:

  • Version-controlled infrastructure definitions
  • Environment parity - dev, staging, production
  • Automated provisioning via CI/CD pipelines
  • Compliance validation built into deployment process

Results + Metrics

The multi-region platform achieved:

  • 99.95% uptime - exceeded SLA requirements
  • < 5 minute RTO - rapid recovery from regional failures
  • Zero data loss - RPO < 1 minute for critical systems
  • Global reach - serving customers across multiple continents
  • Cost optimization - 30% reduction through right-sizing and reserved instances

The platform now provides enterprise-grade reliability and can seamlessly handle regional outages while maintaining service continuity.