Techtide azure waf cost optimization review
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Review Azure workload cost posture against the Well-Architected Framework Cost Optimization pillar: cost modeling, rightsizing, reservations, hybrid benefit, storage lifecycle, and idle resource elimination.
SKILL.md
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Azure WAF Cost Optimization Review
The Azure Well-Architected Framework Cost Optimization pillar focuses on designing workloads that maximize the value delivered while minimizing unnecessary Azure spending.
5 Cost Optimization Design Principles
- Develop a cost model - model costs before deployment; estimate spend based on requirements; track cost KPIs
- Design with a cost-efficiency mindset - favor managed services, consumption-based pricing, and right-sized resources
- Design for usage optimization - enable auto-scaling; schedule workloads; use spot/low-priority VMs for fault-tolerant jobs
- Design for rate optimization - commit to consistent usage via Azure Reservations and Savings Plans; leverage hybrid benefits
- Monitor and optimize over time - track spend continuously; act on cost recommendations; retire underutilized resources
Azure Cost Tools
- Microsoft Cost Management + Billing - cost analysis, budgets, cost alerts, export to storage for Parquet/Athena analysis
- Azure Advisor - cost recommendations: resize/shutdown VMs, buy reservations, delete unused disks
- Azure Monitor + cost alerts - alert on budget thresholds
- Azure Pricing Calculator - pre-deployment cost estimation
- Azure Cost Management Exports - raw billing data to Azure Storage for Power BI / Excel analysis
- Azure Carbon Optimization (preview) - sustainability tracking for carbon footprint reporting
Cost Optimization Areas
Compute
- Right-size VMs using Azure Advisor; use Burstable VMs (B-series) for dev/test
- Spot VMs - up to 90% off list price for interruptible workloads (CI/CD, ML training, batch)
- Azure Batch Spot nodes - bursty HPC at spot pricing
- Auto-shutdown dev VMs outside business hours via Azure DevTest Labs or scheduled stop
Reservations and Savings Plans
- 1yr/3yr Azure Reservations - VMs, SQL, Cosmos DB, App Service, AKS nodes; committed capacity discount
- Azure Savings Plans for Compute - covers VMs, VMSS, AKS, App Service, Functions across regions, SKU families, and sizes; no instance flexibility restrictions
Azure Hybrid Benefit
- Windows Server - up to 40% off VM pricing using existing Software Assurance licenses
- SQL Server - up to 55% off Azure SQL Database and SQL Managed Instance
- Dev/Test pricing - reduced rates for Visual Studio subscribers on eligible services
Storage
- Azure Blob lifecycle management - tiered transition: Hot → Cool → Cold → Archive based on last access time
- Storage Reserved Capacity - commit to blob storage capacity for up to 3 years
- LRS vs GRS vs GZRS selection - match redundancy to actual DR requirements; avoid over-replication
Networking
- Azure Front Door vs Application Gateway vs Load Balancer cost tradeoffs
- ExpressRoute vs VPN Gateway pricing model differences
- Egress data transfer costs - VNet peering is free; egress to internet is billed per GB
Governance
- Management Group + Subscription tagging policy - enforce required tags via Azure Policy deny
- Cost allocation tags - chargeback/showback reporting by team, application, environment, cost-center
- Azure Policy to enforce allowed VM SKUs - prevent accidental high-cost SKU deployment
Assessment Questions
- How do you model and predict cloud costs for your workload?
- How do you ensure resources are correctly sized for the workload?
- How do you use Azure pricing models (reservations, savings plans, spot) to reduce costs?
- How do you monitor and act on cost anomalies?
- How do you retire unused or underutilized resources?
- How do you allocate costs to teams or business units?
- How do you evaluate the cost impact of architectural decisions?
Validation Checklist
- Azure Cost Management budgets configured per subscription with email alerts at 80% and 100%
- 100% of resources tagged with required tags (env, team, app, cost-center) via Azure Policy
- Azure Advisor cost recommendations reviewed and actioned monthly
- Azure Reservations or Savings Plans covering ≥70% of steady-state compute (VMs, AKS nodes, SQL)
- Azure Hybrid Benefit enabled for eligible Windows Server and SQL Server workloads
- Spot VMs or Azure Batch Spot nodes used for CI/CD, ML training, and dev/test workloads
- Blob Storage lifecycle policies active for all storage accounts with data older than 30 days
- Unused resources identified and decommissioned monthly: unattached disks, unused public IPs, empty resource groups, stopped VMs >7 days
- Dev/test VMs auto-shutdown scheduled outside business hours
- Cost allocation report generated monthly for chargeback/showback
Response Shape
Cost visibility and tooling assessment → tagging compliance → reservation/savings plan coverage → rightsizing opportunities → hybrid benefit and spot adoption → storage lifecycle → idle resource inventory → prioritized savings actions
Official Documentation
- https://learn.microsoft.com/azure/well-architected/cost-optimization/
- https://learn.microsoft.com/azure/cost-management-billing/
Security Notes
Read-only advisory. Do not cancel Reservations, delete resources, or modify billing configurations without explicit approval and resource inventory confirmation.