Tuesday, August 26, 2014

Amazon Web Services: AWS Elasticity Principles of elasticity

Traditional/AWS Architecture
-Traditional architecture is based on peak load

-AWS architecture provisions resources on demand / as needed


Elasticity Principle #1: Automate
-        -  Manual intervention= failure to meet demand
-        -  Elastic scaling = Automation
-        -  Preconfigured AMI
-         - Bootstrapping principles

Elasticity Principle #2: Loose Coupling
-          -Tightly coupled applications- apps where one component specifically depends on another specific , single      unit (creates failure or poor performance)
-       -   Loose coupling design uses AWS services or horizontally scaled design. you will need to recode your application.




Elasticity Principle #3: Staying stateless
-Avoid statefull application that stores state information on a single instance
-Instead store state information on a speedy, redundant, shared location (ex. dyanmeDB)


Elasticity Principle #4: Horizontal scaling
-Large instances will eventually hit a limit ( cpu, memory etc)
-Horizontal scaling and design grows without bounds






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