Cost Estimation & Optimization¶
Detailed Cost Breakdown by Component¶
1. Database Layer¶
Production (db.r6i.xlarge + read replica): - RDS Multi-AZ Primary: $1,800/month - RDS Read Replica (db.r6i.large): $900/month - Storage (200GB @ $0.23/GB): $46/month - Backup Storage (30-day retention): $100/month - Total Database: $2,846/month
Staging (db.t3.small): - RDS Primary: $150/month - Read Replica: $100/month - Storage: $15/month - Backup: $20/month - Total: $285/month
Development (db.t3.micro): - RDS Primary: $30/month - Storage: $5/month - Backup: $5/month - Total: $40/month
2. Compute Layer¶
Production: - On-Demand (3 @ t3.large): $900/month - Spot Instances (2 @ t3.large, 70% discount): $270/month - Data Transfer (Out): $500/month - ALB: $300/month - Total: $1,970/month
Staging: - On-Demand (1 @ t3.medium): $200/month - Spot (1 @ t3.medium): $30/month - Data Transfer: $50/month - ALB: $300/month - Total: $580/month
Development: - On-Demand (1 @ t3.small): $20/month - Data Transfer: $10/month - ALB: $300/month - Total: $330/month
3. Caching Layer¶
Production (cache.r6g.xlarge, 3 nodes): - Node cost: $0.658/hour × 3 × 730 = $1,443/month - Reserved Instance 1-year: $960/month (-33%) - Effective: $960/month
Staging (cache.t3.small, 2 nodes): - Cost: $0.054/hour × 2 × 730 = $79/month
Development (cache.t3.micro, 1 node): - Cost: $0.015/hour × 1 × 730 = $11/month
4. Storage Layer¶
Production: - S3 Storage: $300/month - Cross-region replication: $200/month - Total: $500/month
Staging: - S3 Storage: $50/month
Development: - S3 Storage: $5/month
5. Networking & Security¶
Production: - NAT Gateway: $45/month × 2 = $90/month - VPC Flow Logs: $20/month - WAF: $150/month - Total: $260/month
Staging: - NAT Gateway: $45/month - VPC Flow Logs: $10/month - WAF: $150/month - Total: $205/month
Development: - NAT Gateway: $45/month - Total: $45/month
6. Monitoring & Logging¶
Production: - CloudWatch (logs, metrics, dashboards): $50/month - Custom metrics: $5/month - Total: $55/month
Staging: $30/month Development: $10/month
Monthly Cost Summary¶
| Environment | Database | Compute | Cache | Storage | Network | Monitoring | Total |
|---|---|---|---|---|---|---|---|
| Development | $40 | $330 | $11 | $5 | $45 | $10 | $441 |
| Staging | $285 | $580 | $79 | $50 | $205 | $30 | $1,229 |
| Production | $2,846 | $1,970 | $960 | $500 | $260 | $55 | $6,591 |
| Total (All) | $3,171 | $2,880 | $1,050 | $555 | $510 | $95 | $8,261 |
Cost Optimization Strategies¶
1. Reserved Instances (20-50% savings)¶
# Calculate optimal mix
# Production baseline: 3 on-demand + 2 spot
# Year 1 Cost without RI: $23,640
# Year 1 Cost with 1-yr RI (3 instances): $15,700
# Savings: $7,940 (33%)
2. Spot Instances (70% discount)¶
Current configuration uses: - 70% Spot instances for non-critical workloads - 30% On-Demand for baseline reliability - 2-3 Spot pools to tolerate interruptions - Annual Savings: ~$17,000
3. Storage Lifecycle Policies¶
# Transition to cheaper storage classes
0-30 days: STANDARD ($0.023/GB)
30-60 days: STANDARD-IA ($0.0125/GB) → -46% cost
60+ days: GLACIER ($0.004/GB) → -83% cost
180+ days: EXPIRATION → -100% cost
# For 100GB dataset:
# STANDARD (30 days): $2.30
# STANDARD-IA (30 days): $1.24
# GLACIER (120 days): $0.48
# **Monthly average**: $0.67 (vs $2.30) → 70% savings
4. Right-Sizing Recommendations¶
Current Production: db.r6i.xlarge (32 vCPU, 256GB) - If CPU utilization < 20% and memory < 30%, downgrade to db.r6i.large (8 vCPU, 64GB) - Monthly savings: $900/month
Recommendation: Monitor for 2 weeks, then rightsize if utilization permits
5. Data Transfer Optimization¶
Current: ~$500/month (mostly outbound) - Use CloudFront CDN for static content (-$200/month) - Implement VPC endpoints for S3 access (-$50/month) - Potential Savings: $250/month
Cost Monitoring & Alerts¶
AWS Budgets¶
# Create budget alert
aws budgets create-budget \
--budget '{
"BudgetName": "Basecoat-Portal-Monthly",
"BudgetLimit": { "Amount": "7000", "Unit": "USD" },
"TimeUnit": "MONTHLY",
"BudgetType": "COST"
}'
Cost Anomaly Detection¶
Enable AWS Cost Anomaly Detection: - Monitors daily costs - Alerts on 10%+ variance - Machine learning-based baseline
Monthly Review Process¶
- Week 1: Generate cost report from AWS Cost Explorer
- Week 2: Review by Finance & Engineering leads
- Week 3: Implement optimizations
- Week 4: Validate and update budget
Projected Savings (12-month horizon)¶
| Strategy | Effort | Savings |
|---|---|---|
| Reserve 3 prod instances (1-yr) | Low | $7,940 |
| Storage lifecycle policies | Low | $600/month × 12 = $7,200 |
| CDN for static content | Medium | $2,400 |
| Database right-sizing | Medium | $10,800 |
| Compute consolidation | High | $5,000 |
| Total Potential Savings | - | ~$33,340 |
Current 12-month cost: $99,132 Optimized cost: $65,792 Savings: 34%