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What is S3

Simple Service Storage (S3)

  • one of the oldest services

  • 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

  • S3 is safe place to store files

  • Object-based storage

  • Block based storage would be for operating systems (NOT s3)

  • Files can be from 0bytes to 5 TB

  • Unlimited storage

  • Files are stored in Buckets (Folders in cloud)

  • S3 is a universal Namespace so name must be unique GLOBALLY

  • will always be prefixed with https://s3-region...

  • Objects are files that consist of:

  • Key (simply the name of the object)
  • Value (Data that made up of sequence of Bytes)
  • Version ID
  • Metadata
  • Subresources
  • Access Control Lists
  • Torrent

S3 NEED TO KNOW Exam Tips

  • How does consistency work for S3
  • Read after Write consistency for PUTS of new Objects

  • Eventual Consistency for overwrite PUTS and DELETES (can take some time to propagate)

  • If writing file, put a file into S3 you can immediately read that data.

  • If you update existing file or delete file you may get an older version. Basically changes can take some time to propagate to S3

  • S3 has following guarantees

  • 99.99% availability for S3 platform But amazon only Gurantees 99.9% availability
  • AMAZON does guarantee 99.999999999% durability (the 11 9's) So very unlikely to lose File
  • To Calculate: Number of seconds in any given months and multiply it by 99.99%

S3 has the following features

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

S3 Storage Classes

  • S3 - Standard (11 9's )
  • S3 - IA (RAPID access)
  • S3 - One Zone - IA
  • S3 - Intelligent Tiering (using machine learning to determine what you need)
  • S3 - Glacier (secure, durable low cost data archiving)
  • S3 - Glacier Deep Archive (takes 12 hours to retrieve SUPER cheap)

What are you charged for with S3?

  • Storage
  • Requests
  • Storage Management pricing
  • Data Transfer pricing
  • Transfer Acceleration
  • Cross Region Replication Pricing

S3 Transfer Acceleration

enables fast and secure transfers of files over long distances between your end users and s3 buckets. (Users upload to edge sites then use Amazon intranet to upload)

Restricting ACCESS in S3

  1. Use Bucket Policies - Applies across the whole bucket
  2. Object Policies - Applies to individual files
  3. IAM Policies to Users and Groups - applies to users and groups

Static Websites can be hosted in S3 Buckets Dynamic Websites CANNOT be hosted in S3 Buckets S3 buckets scale dynamically

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