The Cloud

  • Virtualised Services
  • Virtual machines spawned on demand
  • Locations of services not certain
  • Similar to network ‘cloud’
  • Cloud is like a transparent layer that client’s don’t see

Flavours of Cloud Computing

  • Traditional IT: responsible for everything
  • Infrastructure aaS: Cloud provides networking, storage, hardware, virtualisation
  • Platform aaS: Cloud manages operating system, databases, security etc. - you only have to provide application

  • Software aaS: Entire stack managed by cloud

  • Characteristics of Cloud Computing
    • On-demand, self-service
    • Network accessible
    • Pooled resources (multi-tenant pool of resources, dynamically reassigned per customer demand)
    • Elasticity (rapid scalability)
    • Measured service (monitor/billed for resources used)

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