s3

# AWS S3

Amazon Simple Storage Service (S3) provides scalable object storage with industry-leading durability (99.999999999%). S3 is fundamental to AWS—used for data lakes, backups, static websites, and as storage for many other AWS services.

## Table of Contents

- [Core Concepts](#core-concepts)
- [Common Patterns](#common-patterns)
- [CLI Reference](#cli-reference)
- [Best Practices](#best-practices)
- [Troubleshooting](#troubleshooting)
- [References](#references)

## Core Concepts

### Buckets

Containers for objects. Bucket names are globally unique across all AWS accounts.

### Objects

Files stored in S3, consisting of data, metadata, and a unique key (path). Maximum size: 5 TB.

### Storage Classes

| Class | Use Case | Durability | Availability |
|-------|----------|------------|--------------|
| Standard | Frequently accessed | 99.999999999% | 99.99% |
| Intelligent-Tiering | Unknown access patterns | 99.999999999% | 99.9% |
| Standard-IA | Infrequent access | 99.999999999% | 99.9% |
| Glacier Instant | Archive with instant retrieval | 99.999999999% | 99.9% |
| Glacier Flexible | Archive (minutes to hours) | 99.999999999% | 99.99% |
| Glacier Deep Archive | Long-term archive | 99.999999999% | 99.99% |

### Versioning

Keeps multiple versions of an object. Essential for data protection and recovery.

## Common Patterns

### Create a Bucket with Best Practices

**AWS CLI:**

```bash
# Create bucket (us-east-1 doesn't need LocationConstraint)
aws s3api create-bucket \
  --bucket my-secure-bucket-12345 \
  --region us-west-2 \
  --create-bucket-configuration LocationConstraint=us-west-2

# Enable versioning
aws s3api put-bucket-versioning \
  --bucket my-secure-bucket-12345 \
  --versioning-configuration Status=Enabled

# Block public access
aws s3api put-public-access-block \
  --bucket my-secure-bucket-12345 \
  --public-access-block-configuration \
    BlockPublicAcls=true,IgnorePublicAcls=true,BlockPublicPolicy=true,RestrictPublicBuckets=true

# Enable