KalpOps Evolving Eternally
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AWS
Terraform
Lambda
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Cloud

Disaster Recovery Implementation

Designed and implemented a multi-region disaster recovery solution with automated failover capabilities, achieving under 5 minute RTO and near-zero RPO for critical business systems.

AWSRoute 53RDS Multi-AZS3 Cross-RegionTerraformLambdaCloudWatch

The Challenge: Single Point of Failure

A financial services company had their entire production infrastructure in a single AWS region. When that region experienced an outage, they lost 8 hours of business operations – translating to hundreds of thousands in revenue loss and damaged customer trust.

🕒
8+ Hours

Last outage duration

💲
$500K+

Revenue lost per outage

📍
Single Region

No redundancy

🔧
Manual

Recovery process

DR Strategy: Active-Passive Multi-Region

I designed an Active-Passive disaster recovery architecture across two AWS regions with automated failover to minimize RTO and RPO:

Primary us-east-1
EC2 + ALB
RDS Primary
ElastiCache
S3 Origin
● Active
Async Replication →
Cross-Region →
DR us-west-2
EC2 + ALB (Standby)
RDS Read Replica
ElastiCache (Cold)
S3 Replica
○ Standby
🌐 Route 53 Health Checks + Failover Routing Automatic DNS failover when primary becomes unhealthy

Key DR Components

🗄️ Database Replication
  • RDS Multi-AZ in primary region
  • Cross-region read replica to DR
  • Automated promotion during failover
  • Near-zero RPO with async replication
📦 Storage Replication
  • S3 Cross-Region Replication (CRR)
  • Same-day replication SLA
  • Versioning enabled
  • Lifecycle policies synchronized
🌐 DNS Failover
  • Route 53 health checks every 10s
  • Failover routing policy
  • TTL set to 60 seconds
  • Automatic traffic switching
⚡ Compute Recovery
  • AMIs replicated to DR region
  • Launch templates synchronized
  • Auto Scaling pre-configured
  • Warm standby capacity

Automated Failover Process

To achieve the under 5 minute RTO, I implemented fully automated failover:

1
Detection Route 53 health check fails (3 consecutive) ~30 seconds
↓
2
DNS Failover Route 53 switches to DR region ~60 seconds (TTL)
↓
3
DB Promotion Lambda promotes RDS read replica to master ~2-3 minutes
↓
4
Service Active DR region serving production traffic Total: Under 5 min

RTO & RPO Achievement

RTO Recovery Time Objective
8+ hours Before
→
Under 5 min After
96% improvement
RPO Recovery Point Objective
24 hours Before
→
Under 1 min After
99.9% improvement

DR Testing & Validation

Implemented a rigorous DR testing program to ensure readiness:

🔄
Weekly Automated health check validation and replication lag monitoring
📋
Monthly Tabletop exercises and runbook review with on-call team
⚠️
Quarterly Full failover drill to DR region during off-peak hours
📊
Annually Comprehensive DR audit with documented recovery validation

Business Impact

Under 5 min RTO Achieved
Under 1 min RPO Achieved
99.99% Availability SLA
4x Quarterly Drills
💲
Risk Mitigation

Protected against $500K+ potential outage losses per incident

📄
Compliance Ready

Met SOC 2 and regulatory requirements for business continuity

❤️
Peace of Mind

Stakeholders confident in infrastructure resilience

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