[DC] Cloud Computing

Basic cloud computing

  • Essential Characteristics
    • Broad network access
    • Rapid elasticity
    • Measured Service
    • On-demand Self-service
    • Resource pooling
  • Service Models
    • SaaS – Software as a Service
    • PaaS – Platform as a Service
    • IaaS – Infrastructure as a Service
  • Deployment Models
    • Public
      • Provisitioned for open use by the general public
    • Private
      • Cloud for the exclusive use by a single organization
      • Managed by IT or thirdparty
      • on-premise or off-premise
    • Hybrid
      • Two or more cloud infrastructures combined
    • Community
      • Multiple organisations combined

What is an API

  • A precise specification written by providers of a service
  • You must follow the specification when using that service
  • An API decribes what functionality is available, how ti must be used and what formats it will accept as input or return as output

 Cloud service models


Software as a Service

  • Fully functional application
  • E-Mail, CRM, Point of Sale
    • Office 365
    • Google mail
  • Salesforce, oracle
  • Consumed by end users

Platform as a Service

  • Platform to load an application on
  • Operation enviorment, Hosting, Services
  • AWS, Windows Azure
  • Consumed by developers

Infrastructure as a Service

  • Automates the deployment of compute, storage, networking, virtualization, and services
  • AWS, Rackspace
  • Consumed by network engineers





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