18. Cost Estimation and Resource Mapping

Cost breakdown and resource optimization for MILU2 Infrastructure.

Monthly Cost Drivers

┌─────────────────────────────────────────────────────────────────┐
│                    Monthly Cost Drivers                          │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│  ███████████████████████████  NAT Gateway (data transfer)       │
│  █████████████████████        ECS Fargate/EC2                   │
│  ████████████████             RDS Aurora Serverless             │
│  ██████████████               CloudFront + WAF                  │
│  ████████████                 Global Accelerator                │
│  ██████████                   ElastiCache + MemoryDB            │
│  ████████                     DocumentDB                        │
│  ██████                       S3 + Lambda                       │
│  ████                         KMS + CloudWatch                  │
│                                                                  │
└─────────────────────────────────────────────────────────────────┘

Compute Resources

Resource	Type	Count	Monthly Est.
ECS Fargate API	1 vCPU / 2GB	1-8	$35-280
ECS Fargate Web	1 vCPU / 2GB	1-8	$35-280
ECS Fargate Admin	1 vCPU / 2GB	1	$35
ECS Fargate Push	0.25 vCPU / 512MB	1	$11
EC2 Bastion	t2.micro	1	$8

Database Resources

Resource	Type	Config	Monthly Est.
RDS Aurora	Serverless v2	0.5-2 ACU	$45-180
ElastiCache	cache.t4g.micro	1 node	$13
MemoryDB	db.t4g.small	1 node	$50
DocumentDB	Serverless	1 instance	$45+

Cost Estimation by Environment

Test Environment (Minimal)

Category	Monthly Cost
Compute	$100-150
Database	$150-200
Networking	$100-150
CDN/Security	$50-100
Storage	$20-50
Total	$420-650

Production Environment (Full)

Category	Monthly Cost
Compute	$500-1000
Database	$500-1000
Networking	$300-500
CDN/Security	$200-500
Storage	$100-300
Total	$1600-3300

Cost Optimization Strategies

Compute Optimization

Strategy	Savings	Implementation
Fargate Spot	Up to 70%	fargate_spot_weight > 0
Right-size tasks	10-30%	Monitor CPU/memory usage
Auto scaling	Variable	Already configured

Database Optimization

Strategy	Savings	Implementation
Auto-pause	Significant	Already enabled (5 min)
Fewer readers	$45+/mo	reader_count = 0
Smaller ACU range	Variable	rds_min_capacity = 0.5

Monthly Cost Review Checklist

☐ Review Cost Explorer trends
☐ Check for unexpected spikes
☐ Verify auto-scaling worked correctly
☐ Review RDS auto-pause effectiveness
☐ Check NAT Gateway data transfer
☐ Review CloudFront cache hit ratio
☐ Check for unused resources
☐ Update cost forecasts