AWS Simple Storage Service (s3)

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Amazon Web Services
AWS S3: Simple Storage Service

S3 – Basics
• S3 is a safe place to store your files.
• It is Object based storage.
• The data is spread across multiple devices and facilities
• S3 is Object based i.e. allows you to upload files.
• File size can be from 0 Bytes to 5 TB.
• There is unlimited storage
• Files are stored in Buckets.
• Account→Bucket -> Object

S3 – Basics
• S3 bucket has a universal namespace, that is, names must be unique globally.
• https://s3-eu-west-1.amazonaws.com/ashishrpandeyfirstbucket
• When you upload a file to S3 you will receive a HTTP 200 code if the upload was successful.
• S3 provides developers and IT teams with secure, durable, highly-scalable object storage.
• Amazon S3 is easy to use, with a simple web services interface to store and retrieve any amount of data
from anywhere on the web.

S3 – Buckets
• You can then upload any number of objects (pics, docs etc) to the bucket.
• An Amazon S3 bucket name is globally unique and buckets are created in a region you specify
• You can create up to 100 buckets in each of your AWS accounts.
• There is no limit to the number of objects that can be stored in a bucket and no difference in performance
whether you use many buckets or just a few.
• You cannot create a bucket within another bucket.
• You can delete the bucket when not in use and that bucket name can be reused.
• If you want other users or AWS resources to access your bucket you have to make it public
• You can have multiple versions of objects in your bucket by enabling version control

S3 – Static Web hosting
• You can host a static website on Amazon S3
• Amazon S3 does not support server-side scripting.
• To host a static website, you configure an Amazon S3 bucket for website hosting, and then upload your
website content to the bucket.
• This bucket must have public read access.
• The website is then available at the AWS Region-specific website endpoint of the bucket

S3 – Cross Region Replication
● Cross-region replication is a bucket-level configuration that enables automatic, asynchronous copying of
objects across buckets in different AWS Regions
● These buckets can be owned by different AWS accounts.
● You need to add a replication configuration to your source bucket to direct Amazon S3 to replicate objects
● Amazon S3 stores object replicas using the same storage class as the source object

S3 Features
•Durability and availability
•Tiered Storage Available
• Lifecycle Management
•Versioning
•Encryption
•Secure your data using Access Control Lists and Bucket Policies

S3 Storage Classes:
• S3-Standard - 99.99% availability, 99.999999999% durability, stored redundantly across multiple devices in
multiple facilities and is designed to sustain the loss of 2 facilities concurrently.
• S3 - IA (Infrequently Accessed): For data that is accessed less frequently, but requires rapid access when
needed. Lower fee than S3, but you are charged a retrieval fee.
• S3-one-zone-IA : For data that is accessed less frequently, but requires rapid access when needed, but
replicated within one-zone only.
• Reduced Redundancy Storage - Designed to provide 99.99% durability and 99.99% availability of objects
over a given year.
• Glacier - Very cheap, but used for archival only. It takes 3 – 5 hours to restore from Glacier.

S3 Storage Class Comparison:
S3 Standard
S3 Standard-
IA
S3
One Zone-IA
Amazon
Glacier
Designed for
Durability
99.999999999% 99.999999999% 99.999999999%† 99.999999999%
Designed for
Availability
99.99% 99.9% 99.5% N/A
Availability SLA 99.9% 99% 99% N/A
Availability Zones >3 >3 1 >3
Minimum Capacity
Charge per Object
N/A 128KB* 128KB* N/A
Minimum Storage
Duration Charge
N/A 30 days 30 days 90 days
Retrieval Fee N/A per GB retrieved per GB retrieved per GB retrieved**
First Byte Latency milliseconds milliseconds milliseconds
select minutes or
hours***
Storage Type Object Object Object Object
Lifecycle Transitions Yes Yes Yes Yes

S3 Storage Classes:
What is Glacier??
Glacier is an extremely low-cost storage service for data archival. Amazon Glacier stores data for as little as
$0.01 per gigabyte per month, and is optimized for data that is infrequently accessed and for which retrieval
times of 3 to 5 hours are suitable.

S3 Charges:
Charged for
- Storage space
- Requests
- Storage Management Pricing
- Data Transfer Pricing
- Transfer Acceleration
For more details refer to :
https://calculator.s3.amazonaws.com/index.html

S3 Transfer Acceleration:
• Amazon S3 Transfer Acceleration enables fast, easy, and secure transfers of ﬁles over long distances
between your end users and and S3 bucket.
• Transfer Acceleration takes advantage of Amazon CloudFront’s globally distributed edge locations. As the
data arrives at an edge location, data is routed to Amazon S3 over an optimized network path.

S3 Life Cycle Management:
• Can be used in conjunction with versioning.
• Can be applied to current versions and previous versions.
• Following actions can now be done
• Transition to the Standard - Infrequent Access Storage Class
(128Kb and 30 days after the creation date).
• Archive to the Glacier Storage Class (30 days after IA, if relevant)
• Expire

S3 Securing your bucket:
• By default, all newly created buckets are PRIVATE
• You can setup access control to your buckets using;
- Bucket Policies
- Access Control Lists
• S3 buckets can be conﬁgured to create access logs which log all requests made to the S3 bucket. This can
also be done to another bucket.

S3 Securing your bucket:
• In Transit
- SSL/TLS
• At Rest
Server Side Encryption
- S3 Managed Keys – SSE(Server Side Encryption)-S3
- AWS Key Management Service, Managed Keys - SSE-KMS
- SSE with Customer Provided Keys -SSE-C
Client Side Encryption

S3 Server Access Logging
● To track requests for access to your bucket, you can enable access logging.
● Each access log record provides details about a single access request such as the requester, bucket
name, request time, request action, response status, and error code
● Access log information can be useful in security and access audits.
● It can also help you learn about your customer base and understand your Amazon S3 bill.
● By default, logging is disabled. When logging is enabled, logs are saved to a bucket in the same AWS
Region as the source bucket.

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AWS Simple Storage Service (s3)

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