Configure Production Load Balancer Architecture

## Architecture Recommendation For your Node.js API with high traffic requirements, I recommend a multi-tier load balancing approach using AWS Application Load Balancer (ALB) with Nginx as reverse proxy. **Architecture:** ``` Internet → CloudFlare CDN → AWS ALB → Nginx (2 instances) → Node.js Apps (4 instances) ``` ## ALB Configuration ```yaml Type: AWS::ElasticLoadBalancingV2::LoadBalancer Properties: Type: application IpAddressType: ipv4 SecurityGroups: [!Ref ALBSecurityGroup] Subnets: [!Ref PublicSubnet1, !Ref PublicSubnet2] ``` ## Health Check Setup ```javascript // Health check endpoint app.get('/health', (req, res) => { // Check database connection db.query('SELECT 1', (err) => { if (err) return res.status(503).json({status: 'unhealthy'}); res.json({status: 'healthy', timestamp: new Date()}); }); }); ``` ## Nginx Configuration ```nginx upstream backend { least_conn; server 10.0.1.10:3000 max_fails=3 fail_timeout=30s; server 10.0.1.11:3000 max_fails=3 fail_timeout=30s; } server { listen 80; location / { proxy_pass http://backend; proxy_set_header X-Real-IP $remote_addr; } } ``` **Monitoring:** Use CloudWatch with custom metrics for response time <200ms and error rate <1%. **Estimated cost:** $650/month including ALB, monitoring, and SSL certificates.