aws-cost-optimization

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• SKILL.md

SKILL.md (first lines)

# AWS Cost Optimization

Apply practical FinOps controls to reduce AWS spend without sacrificing reliability or performance.

## When to Use This Skill

- Monthly AWS bill spikes unexpectedly or exceeds budget thresholds
- Preparing cost reviews with engineering and finance teams
- Rightsizing EC2, RDS, EKS, or Lambda workloads after load testing
- Choosing between Savings Plans, Reserved Instances, or on-demand pricing
- Setting up automated budget alerts and anomaly detection
- Cleaning up unused resources (unattached EBS, idle load balancers, old snapshots)
- Optimizing data transfer costs across regions and AZs

## Prerequisites

- AWS CLI v2 installed and configured (`aws configure`)
- IAM permissions: `ce:*`, `budgets:*`, `ec2:Describe*`, `cloudwatch:PutMetricAlarm`, `s3:PutLifecycleConfiguration`
- Cost Explorer enabled in the AWS billing console (takes 24 hours to populate)
- Cost allocation tags activated in the Billing console

## Cost Review Workflow

Start read-only with the confirmed account/profile/regions and least-privilege billing access; the permission list is illustrative, not a role to grant wholesale. Dates, dollar thresholds and identifiers below are examples. Review savings against availability, recovery objectives and retrieval/transition costs. No automatic purchases, resource shutdown, deletion or lifecycle expiry follows from identifying a recommendation. Export the current lifecycle configuration and review the full replacement before applying it; noncurrent-version expiration permanently removes recovery copies.

1. Tag every resource by team, service, environment, and cost center.
2. Enable Cost Explorer and activate Cost and Usage Reports (CUR) to S3.
3. Identify top spend drivers by service, account, and tag.
4. Rightsize underutilized compute and storage based on CloudWatch metrics.
5. Apply commitment discounts (Savings Plans or RIs) for stable baseline usage.
6. Set budgets, anomaly alerts, and build KPI dashboards.
7. Review monthly and iterate.

## Cost Explorer CLI Commands

```bash
# Get cost and usage for the last 30 days grouped by service
aws ce get-cost-and-usage \
  --time-period Start=2026-02-01,End=2026-03-01 \
  --granularity MONTHLY \
  --metrics "BlendedCost" "UnblendedCost" "UsageQuantity" \
  --group-by Type=DIMENSION,Key=SERVICE

# Get cost forecast for the next 30 days
aws ce get-cost-forecast \
  --time-period Start=2026-03-24,End=2026-04-24 \
  --metric UNBLENDED_COST \
  --granularity MONTHLY

# Get cost grouped by a specific tag (e.g., team)
aws ce get-cost-and-usage \
  --time-period Start=2026-02-01,End=2026-03-01 \
  --granularity MONTHLY \
  --metrics "UnblendedCost" \
  --group-by Type=TAG,Key=team

# Get rightsizing recommendations for EC2
aws ce get-rightsizing-recommendation \
  --service "AmazonEC2" \
  --configuration '{"RecommendationTarget":"SAME_INSTANCE_FAMILY","BenefitsConsidered":true}'

# Get Savings Plans purchase recommendation
aws ce get-savings-plans-purchase-recommendation \
  --savings-plans-type COMPUTE_SP \
  --term-in-years ONE_YEAR \
  --payment-option NO_UPFRONT \
  --lookback-period-in-days SIXTY_DAYS

# Get Savings Plans utilization
aws ce get-savings-plans-utilization \
  --time-period Start=2026-02-01,End=2026-03-01 \
  --granularity MONTHLY

# Get Reserved Instance utilization
aws ce get-reservation-utilization \
  --time-period Start=2026-02-01,End=2026-03-01 \
  --granularity MONTHLY
```

## Budget Alerts

```bash
# Create a monthly cost budget with email alert at 80% and 100%
aws budgets create-budget \
  --account-id 123456789012 \
  --budget '{
    "BudgetName": "monthly-total",
    "BudgetLimit": {"Amount": "5000", "Unit": "USD"},
    "TimeUnit": "MONTHLY",
    "BudgetType": "COST",
    "CostFilters": {},
    "CostTypes": {
      "IncludeTax": true,
      "IncludeSubscription": true,
      "UseBlended": false
    }
  }' \
  --notifications-with-subscribers '[
    {
      "Notification": {
        "NotificationType": "ACTUAL",
        "ComparisonOperator": "GREATER_THAN",
        "Threshold": 80,
        "ThresholdType": "PERCENTAGE"
      },
      "Subscribers": [{"SubscriptionType": "EMAIL", "Address": "finops@example.com"}]
    },
    {
      "Notification": {
        "NotificationType": "ACTUAL",
        "ComparisonOperator": "GREATER_THAN",
        "Threshold": 100,
        "ThresholdType": "PERCENTAGE"
      },
      "Subscribers": [{"SubscriptionType": "EMAIL", "Address": "finops@example.com"}]
    }
  ]'

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