AWS S3 Management Skill

Manage S3 buckets with enterprise security and cost optimization.

Quick Reference

Attribute	Value
AWS Service	S3
Complexity	Low-Medium
Est. Time	5-15 min
Prerequisites	AWS account

Parameters

Required

Parameter	Type	Description	Validation
bucket_name	string	Globally unique name	^[a-z0-9][a-z0-9.-]{1,61}[a-z0-9]$
region	string	AWS region	Valid region code

Optional

Parameter	Type	Default	Description
versioning	bool	false	Enable versioning
encryption	string	AES256	SSE-S3, SSE-KMS, or none
public_access_block	bool	true	Block public access
lifecycle_rules	array	[]	Lifecycle configurations
cors_rules	array	[]	CORS configuration

Execution Flow

1. Validate bucket name availability
2. Create bucket with region
3. Configure Block Public Access
4. Enable encryption
5. Set versioning (if enabled)
6. Apply lifecycle rules
7. Configure logging

Implementation

Create Secure Bucket

# Create bucket
aws s3api create-bucket \
  --bucket my-secure-bucket \
  --region us-east-1

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

# Enable encryption
aws s3api put-bucket-encryption \
  --bucket my-secure-bucket \
  --server-side-encryption-configuration '{
    "Rules": [{
      "ApplyServerSideEncryptionByDefault": {
        "SSEAlgorithm": "AES256"
      }
    }]
  }'

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

Lifecycle Rule Example

{
  "Rules": [
    {
      "ID": "MoveToGlacier",
      "Status": "Enabled",
      "Filter": {"Prefix": "logs/"},
      "Transitions": [
        {"Days": 30, "StorageClass": "STANDARD_IA"},
        {"Days": 90, "StorageClass": "GLACIER"}
      ],
      "Expiration": {"Days": 365}
    }
  ]
}

Retry Logic

def s3_operation_with_retry(operation, max_retries=3):
    for attempt in range(max_retries):
        try:
            return operation()
        except s3.exceptions.SlowDown:
            wait = 2 ** attempt
            time.sleep(wait)
        except s3.exceptions.ServiceUnavailable:
            time.sleep(2 ** attempt)
    raise Exception("Max retries exceeded")

Observability

CloudWatch Metrics

• BucketSizeBytes - Total bucket size
• NumberOfObjects - Object count
• AllRequests - Request count
• 4xxErrors / 5xxErrors - Error rates

Access Logs

bucket_owner bucket [time] remote_ip requester request_id operation key

Troubleshooting

Common Issues

Symptom	Cause	Solution
BucketAlreadyExists	Name taken globally	Choose unique name
AccessDenied	IAM or bucket policy	Check both policies
SlowDown	Request rate exceeded	Add random prefix to keys
NoSuchBucket	Bucket deleted	Verify bucket exists

Debug Checklist

• Bucket name globally unique?
• Block Public Access enabled?
• Bucket policy not overly permissive?
• Encryption enabled?
• Versioning enabled for critical data?
• Lifecycle rules not conflicting?

Access Denied Resolution

Check order:
1. IAM user/role policy (s3:GetObject, etc.)
2. Bucket policy (Principal, Resource)
3. Block Public Access settings
4. Object ACL (if ACLs enabled)
5. VPC Endpoint policy (if using)

Cost Optimization

Storage Class	Cost	Retrieval	Use Case
Standard	$$$	Instant	Frequent access
Intelligent-Tiering	$$	Instant	Unknown pattern
Standard-IA	$	Instant	Infrequent
Glacier Instant	¢	Milliseconds	Archive, quick access
Glacier Flexible	¢	Minutes-hours	Archive
Glacier Deep Archive	¢	Hours	Long-term

Test Template

def test_s3_bucket_creation():
    # Arrange
    bucket_name = f"test-bucket-{uuid.uuid4().hex[:8]}"

    # Act
    s3.create_bucket(Bucket=bucket_name)
    s3.put_public_access_block(
        Bucket=bucket_name,
        PublicAccessBlockConfiguration={
            'BlockPublicAcls': True,
            'IgnorePublicAcls': True,
            'BlockPublicPolicy': True,
            'RestrictPublicBuckets': True
        }
    )

    # Assert
    response = s3.get_public_access_block(Bucket=bucket_name)
    assert response['PublicAccessBlockConfiguration']['BlockPublicAcls']

    # Cleanup
    s3.delete_bucket(Bucket=bucket_name)

Assets

• assets/s3-lifecycle.json - Lifecycle configuration template

References

• S3 User Guide
• S3 Security Best Practices