aws-cost-optimizer

# AWS Cost Optimizer

Analyze and optimize AWS costs with actionable recommendations.

## Quick Start

Review Cost Explorer, identify top costs, right-size instances, use Reserved Instances, delete unused resources.

## Instructions

### Cost Analysis Process

1. **Identify cost drivers**
2. **Analyze usage patterns**
3. **Recommend optimizations**
4. **Estimate savings**
5. **Implement changes**

### Using AWS Cost Explorer

**Access Cost Explorer:**
- AWS Console → Billing → Cost Explorer
- View costs by service, region, tag

**Key metrics to check:**
- Monthly costs by service
- Cost trends over time
- Unused or underutilized resources
- Data transfer costs

### EC2 Cost Optimization

**Right-sizing instances:**

Check utilization:
```bash
# Get CloudWatch metrics
aws cloudwatch get-metric-statistics \
  --namespace AWS/EC2 \
  --metric-name CPUUtilization \
  --dimensions Name=InstanceId,Value=i-1234567890abcdef0 \
  --start-time 2024-01-01T00:00:00Z \
  --end-time 2024-01-31T23:59:59Z \
  --period 3600 \
  --statistics Average
```

**Recommendations:**
- CPU < 20%: Downsize instance type
- CPU > 80%: Upsize or add instances
- Memory < 50%: Consider smaller instance

**Reserved Instances:**
- 1-year: ~30-40% savings
- 3-year: ~50-70% savings
- Best for predictable workloads

**Savings Plans:**
- More flexible than Reserved Instances
- Commit to $/hour usage
- Apply across instance families

**Spot Instances:**
- Up to 90% savings
- For fault-tolerant workloads
- Batch processing, CI/CD, testing

**Stop unused instances:**
```bash
# Find stopped instances
aws ec2 describe-instances \
  --filters "Name=instance-state-name,Values=stopped" \
  --query 'Reservations[].Instances[].[InstanceId,Tags[?Key==`Name`].Value|[0]]'

# Terminate if not needed
aws ec2 terminate-instances --instance-ids i-1234567890abcdef0
```

### S3 Cost Optimization

**Lifecycle policies:**
```json
{
  "Rules": [{
    "Id": "Archive old data",
    "Status": "Enabled",
    "Transitions": [