Operations
Cost Optimization
Cloud costs can spiral without deliberate management. Cost optimization is about getting the most value from your infrastructure spend while avoiding waste.
- Right-Sizing â Match resources to actual needs
- Reserved Capacity â Commit for discounts
- FinOps â Cultural practice of financial accountability
Cost optimization is not about spending less â it's about spending wisely.
The Cloud Cost Problem
Cloud computing shifts capital expenditure to operational expenditure, but without governance, costs grow unchecked.
Right-Sizing
Matching instance types and sizes to actual workload requirements.
Right-Sizing Strategy
| Step | Action |
|---|---|
| 1 | Collect utilization metrics (CPU, memory, network, disk) |
| 2 | Identify underutilized instances (< 30% average) |
| 3 | Right-size to smaller instance type |
| 4 | Switch to Graviton/ARM if supported |
| 5 | Use spot instances for fault-tolerant workloads |
| 6 | Set up autoscaling policies |
Pricing Models
Pricing Strategy
Storage Optimization
| Tier | Access Pattern | Cost/GB/month | Use Case |
|---|---|---|---|
| Hot | Frequent | $0.023 | Active data, databases |
| Warm | Infrequent | $0.0125 | Recent logs, analytics |
| Cold | Rare | $0.004 | Compliance, archives |
| Archive | Never | $0.001 | Long-term backup |
FinOps
A cultural practice for financial accountability in cloud spending.
FinOps Lifecycle
| Phase | Activities |
|---|---|
| Inform | Showback/chargeback, budgeting, forecasting |
| Optimize | Right-sizing, reserved instances, architecture |
| Operate | Continuous monitoring, anomaly detection, governance |
Cost Monitoring
| Metric | Description | Target |
|---|---|---|
| Cost per transaction | Infrastructure cost per business unit | Decreasing trend |
| Utilization rate | CPU/memory usage vs provisioned | > 60% average |
| Idle cost | Spend on unused resources | < 5% of total |
| Savings coverage | % of spend covered by reservations | > 70% for steady-state |
Practice Exercises
-
Analysis: A startup spends $50,000/month on AWS. Analyze their usage: 40% on-demand EC2, 20% RDS, 15% S3, 15% data transfer, 10% other. Identify optimization opportunities.
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Strategy: Design a cost optimization strategy for a SaaS company with 100 microservices. Include right-sizing, pricing models, and autoscaling policies.
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Storage: Design a storage tiering strategy for a healthcare app with 50TB of data: 5TB accessed daily, 15TB weekly, 30TB monthly. Calculate monthly costs with and without tiering.
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FinOps: Implement a showback system for a 50-person engineering team. How do you attribute cloud costs to services, teams, and features?
What to Learn Next
-> Containerization Docker, Kubernetes, and resource management.
-> Scalability Fundamentals Vertical vs horizontal scaling and capacity planning.
-> CDN Edge caching and content distribution.
-> Observability Logging, metrics, tracing, and monitoring.
-> Load Balancing Distribution algorithms and health checks.
-> CI/CD Pipelines Continuous integration and deployment strategies.