Cloud Computing

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Cloud Computing
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Cloud Computing defined

• Dynamically scalable, device-independent and
  task-centric computing resources are provided
  online, with all charges being on a usage basis.

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Cloud Computing

• Online accessible applications, processing power
  and/or storage provided to clients on demand
• Cloud the Internet
• Implementation details are abstracted from the
  users (s/w, h/w and infrastructure)
• Servers (physical and/or virtual) are the basic
  component of the cloud

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CC Characteristics

• Apps (s/w), processing power and storage (h/w)
  accessed on the Internet, online
• Task-centric computing
• Device/platform independent computing
• Dynamically scalable, on-demand computing
• Resources are available with variable, per-usage
  costs (not fixed)

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Coming a full circle

• Centralized computing
• Different than mainframe-based models of 1960s
• Cloud is more distributed, reliable and larger
  scale
• Because there are no fixed costs, cloud resources
  are more accessible to small companies

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Cloud computing suppliers

• Zoho CRM (customer relationship management),
  Email hosting, project management, etc.
• Employease HR, benefits, payroll
• Salesforce CRM, sales and customer service apps
• Clarizen project management and collaboration
  s/w

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3 models of Cloud computing

• Software as a Service (Saas)
• Platform as a Service (Paas)
• Infrastructure as a Service (Iaas), sometimes
  known as Hardware as a Service (Haas).

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SaaS

• Running existing online applications.
• Online productivity tools, including word
  processing, spreadsheet, presentation
  GoogleDocs, Zoho, Microsoft)
• creative web tools - Pixlr, Jaycut, Aviary
• dedicated business applications Salesforce,
  Employease, NetSuite .
• Available for free or as a subscription service,
  accessible from any Internet client, facilitate
  collaboration.
• The disadvantage is that they are not customized
  enough, too generic.

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PaaS

• Environment and a set of tools to create online
  applications,
• Google App Engine, Microsoft Windows Azure
  platform, VMWare vFabric, Force.com from
  Salesforce.com (Google and force.com are free).
• Allows quick development of applications without
  much additional cost.
• Can deploy applications privately or publicly.
• Limits developers to an existing set of tools and
  languages and platform dependency.

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IaaS

• Allows a business to run their own applications
  on the cloud hw without investing in its own hw
  infrastructure.
• Cloud suppliers can use actual physical or
  virtual servers to host applications.
• Amazon Elastic Compute Cloud (EC2) (rent virtual
  computers) Rackspace (private cloud and cloud
  hosting) GoGrit (cloud hosting, hybrid hosting,
  dedicated), VMWare vSphere

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4 types of IaaS

• Private cloud (certain physical servers are
  dedicated to one customer)
• Dedicated hosting (customer rents physical
  servers on demand as needed)
• Hybrid hosting (a mix of physical and virtual
  servers to reduce cost and increase flexibility)
• Cloud Hosting (customer rents virtual servers on
  demand as needed, sometimes hourly).

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Iaas Categories
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Cloud concerns

• Availability
• Privacy
• Data theft/loss
• Security

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Case studies

• Amazon Web Services
• AWS Case Studies