Amazon S3 Concepts

External

• https://docs.aws.amazon.com/AmazonS3/latest/dev/Welcome.html

Internal

• Amazon S3

Overview

Amazon Simple Storage Service (S3) is an object storage service. It can be used to store and protect any amount of data for a range of use cases, such as websites, mobile applications, backup and restore, archive, enterprise applications, IoT devices and big data analytics. Amazon S3 is designed for 99.999999999% (11 9's) of durability. The S3 service can be integrated and exposed externally via the Amazon API Gateway.

The fundamental storage entity in S3 is the object. Objects are contained in buckets.

Object

Working with Amazon S3 Objects

An object is the fundamental entity stored in Amazon S3. Each object consists of data, a key, and metadata. Every S3 object can be uniquely addressed through a combination of the web service endpoint, bucket name, key and optionally a version. Assuming that "blue" is the bucket name, and "2021-01-01/picture.jpg" is the key, the object can be accessed as https://blue.s3.amazonaws.com/2021-01-01/picture.jpg

Data

The data portion of an object is opaque to Amazon S3.

Key

Object Keys

The object key and its version ID uniquely identify the object in a bucket, and the combination of a bucket, key and version ID uniquely identify globally each object stored in Amazon S3. Every object in a bucket has exactly one key.

Version ID

https://docs.aws.amazon.com/AmazonS3/latest/dev/Versioning.html

Metadata

Object Metadata

The object metadata is a set of key/value pairs that describe the object. Metadata include some default pairs: date last modified, and standard HTTP metadata such as Content-Type. Custom metadata can be specified at the time the object is stored. After the object was stored, the object metadata cannot be modified. The only way to modify the metadata is to make a copy of the object and set the metadata.

Bucket

The Amazon S3 data model is a flat structure: you create a bucket, and the bucket stores objects. There is no hierarchy of subbuckets or subfolders; however, you can infer logical hierarchy using key name prefixes and delimiters. The Amazon S3 console supports a concept of folders. The console uses the key name prefixes and the delimiter ('/') to present a folder structure.

Bucket ARN

arn:aws:s3:::bucket-name

Bucket Permissions

By default, all S3 buckets are private and can be accessed only by users that are explicitly granted access.

Bucket Policy

Operations:

Grant an AWS Account Permissions on a Bucket