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Sentinel Scaling and Cost Optimization Guide

This guide provides strategies and procedures for scaling the Sentinel system and optimizing costs as usage grows.

Scaling Strategies

Horizontal Scaling

Lambda Functions

  • Reserved Concurrency: Set limits for critical functions
  • Provisioned Concurrency: Use for consistent performance
  • Queue Management: Implement SQS for load distribution

Database Scaling

# Enable DynamoDB auto-scaling
aws application-autoscaling register-scalable-target \
    --service-namespace dynamodb \
    --resource-id table/sentinel-articles-prod \
    --scalable-dimension dynamodb:table:ReadCapacityUnits \
    --min-capacity 5 \
    --max-capacity 1000

Vertical Scaling

Resource Optimization

  • Lambda Memory: Optimize based on performance testing
  • DynamoDB Capacity: Right-size based on usage patterns
  • OpenSearch: Scale capacity units based on query volume

Cost Optimization

Resource Right-Sizing

  • Monitor utilization metrics weekly
  • Adjust Lambda memory allocation
  • Optimize DynamoDB capacity modes
  • Implement S3 lifecycle policies

Reserved Capacity

  • Purchase reserved capacity for predictable workloads
  • Use Savings Plans for flexible compute usage
  • Monitor usage patterns for optimization opportunities

Data Lifecycle Management

# S3 lifecycle policy for cost optimization
aws s3api put-bucket-lifecycle-configuration \
    --bucket sentinel-content-prod \
    --lifecycle-configuration '{
      "Rules": [
        {
          "ID": "CostOptimization",
          "Status": "Enabled",
          "Transitions": [
            {"Days": 30, "StorageClass": "STANDARD_IA"},
            {"Days": 90, "StorageClass": "GLACIER"}
          ]
        }
      ]
    }'

Monitoring and Alerts

Cost Monitoring

  • Set up billing alerts for budget thresholds
  • Monitor daily costs with CloudWatch
  • Use AWS Cost Explorer for trend analysis
  • Implement cost allocation tags

Performance Monitoring

  • Track response times and error rates
  • Monitor resource utilization
  • Set up auto-scaling triggers
  • Review capacity planning monthly