Fundamentally there are two types of storage:

  1. Object-Based Storage
  2. Block-Based Storage

Simple Storage Service (S3) - Object-Based Storage

It provides developers and IT Teams with secure, durable, highly-scalable object storage. It is easy to use the simple web interface to store and retrieve any amount of data from anywhere on the web.

It is a place to store your files on AWS. and data is spread across multiple devices and facilities.

Think about S3 to store your photos or files.

  1. Object based storage
  2. Unlimited storage
  3. Files are stored in Buckets/Folders
  4. Names must be unique globally
  5. Every time you have a successful upload you get a http 200 code back

S3 is primarily used for:

  1. Store and Backup
  2. Application File Hosting
  3. Media Hosting
  4. Software Delivery
  5. Storing AMI’s and Snapshots

Data consistency Model – S3

S3 data consistency model provides strong read after write consistency for PUT and DELETE requests of objects in the S3 bucket.

Objects consist of the following:

  1. Key – this is simply the file name of the object.
  2. Value – the data and is made up of a sequence of bytes.
  3. Versioning – which version of the object is this
  4. MetaData – Additional information about the data file you are storing.

Think, if you are storing a music track/song. This would have metadata like the information of the singer, the year it was released, the name of the album, etc.

Sub resources

  1. Access Control list – this determines whether we can access the file on S3. This can be done at the file level or at the Bucket level.
  2. Torrent – supports the Bit torrent protocol.
  3. Built for 99.99% availability of the S3
  4. Durability guarantee – 99.9%… (11.9s)
  5. Tiered storage Availability
  6. Lifecycle management
  7. Versioning
  8. Encryption
  9. Secure the data using Access control lists and Bucket policies

S3 – IA (Infrequently Accessed)

It is used for data that is accessed less frequently but requires rapid access when needed. This costs lesser than S3 but you are charged for the retrieval of the data.

S3 – RRS (Reduced Redundancy Storage)

It provides less durability with the same level of availability.

For example, this is about data you could potentially regenerate like a tax calculation or a payslip. This is cheaper. Suppose you create thumbnails for all your pictures. If you lose a thumbnail you could always regenerate it.

When deciding which storage to use think about the various storage options, their advantages vs disadvantages. Are you optimizing for durability, the frequency of retrieval, or availability?

Image comparing the various types of S3


Charging model

  1. Storage
  2. Number of requests
  3. Storage Management Pricing
  4. Add metadata to see usage metrics.

Transfer Acceleration - Enables fast, easy and secure transfers of your files over long distances between your end-users and an S3 bucket.

Transfer acceleration takes advantage of Amazon cloud front’s globally distributed edge locations. As the data arrives at an edge location, the data is routed to Amazon S3 over an optimized network path.

Think of transfer acceleration as a combination of S3 and CDN natively supported by this Service. Basically, every user ends up going through the closest possible edge location which in turn talks to the actual S3 bucket.

Recap - S3

S3 Storage Classes

  1. S3 (Durable, immediately available and frequently accessed)
  2. S3 – IA (durable, immediately available, infrequently accessed)
  3. S3 Reduced Redundancy Storage (Used for data that is easily reproducible, such as thumbnails)

Core fundamentals of S3 objects

  1. Key: Name of the object these are stored in alphabetic order
  2. Value: The data itself
  3. Version ID: The version of the object
  4. Meta Data: The various attributes of the data

Sub resources

  1. ACL: Access control lists
  2. Torrent: bit Torrent protocol

Cross-region Replication

This basically means that if you have this turned on then for a bucket AWS will automatically make a bucket available across 2 or more regions.

Example of an Amazon S3 hosted website architecture


Securing your S3 Buckets

  1. By default, all buckets are private
  2. You can set up access control for your use
  3. Bucket Policies
  4. Access control lists (ACL)
  5. S3 buckets can be configured to create access logs

Encryption for S3

  1. In-transit
  2. SSL/TLS (using HTTPS)
  3. At Rest
  4. Server-Side Encryption
  5. S3 Managed keys – SSE-S3
  6. Server-side Encryption
  7. Key Management Service – Managed Key
  8. SST – KMS
  9. Client-Side Encryption