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Introduction to Cloud ComputingIntroduction to Cloud Computing

Jian TangJian Tang01/19/201201/19/2012

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OutlineOutline Definition

Architecture

Why Cloud Computing

Services

Types

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DefinitionDefinition “Cloud” is a metaphor for the Internet.

Cloud computing is new location-independent computing model, in which shared servers and data storage devices provide resources, software, and data to users in an on-demand manner, just like the electricity grid.

Cloud computing -> Network is computer

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ArchitectureArchitecture

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ArchitectureArchitecture Client (end user): web browser or an APP

Service: functions in cloud computing

Application: backbone of service

Platform: software infrastructure for applications, e.g., Windows Azure, Google App Engine, VMware Foundry, Heroku.

Storage: disks, tapes, optical, memory, etc

Infrastructure: IT hardware and facilities

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Why Cloud ComputingWhy Cloud Computing The milk/cow example

The power/power plant example

The restaurant example

From business point of view, most of time it is better to rent than buy.

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Why Cloud ComputingWhy Cloud Computing No capital expenses needed

Customers only pay a fee for what are used

Flexible capacity and feature sets

No risk of obsolescence

No facilities and engineering cost incurred

Guaranteed business continuity and disaster recovery

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ServicesServices Software as a Service (SaaS)

Infrastructure as a Service (IaaS)

Platform as a Service (PaaS)

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SaaSSaaS A software distribution model in which applications are hosted by

vendor or service provider and made available to users over Internet.

Network-based management and access to commercially available software from central locations rather than at each user’s site.

Application delivery follows a one-to-many model as opposed to a traditional one-to-one model.

Centralized administration

Examples: Gmail/Hotmail, Google Docs, TurboTax, iCube online OS, etc

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SaaSSaaSBenefits:No powerful computer needed.

No installation needed.

Automated update and patch management services.

Data compatibility across the enterprise (All users have the same version of software).

Facilitated, enterprise-wide collaboration.

Global accessibility.

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IaaSIaaS The delivery of computer infrastructure (servers, storage, networking

components) as a service.

The IaaS provider owns the equipment and is responsible for housing, running and maintaining it.

The client typically pays on a per-use basis.

Examples: Amazon EC2, Joyent, GoGrid, Dropbox

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IaaSIaaSBenefits:Ready access to a preconfigured environment

Use of latest technology for equipment

Secured “sand-box” computing platform

Ability to manage service peaks and valleys

No capital investments needed

Reduced time, cost and complexity in adding new features and capacities

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PaaSPaaS Delivery of computing platform and solution stack as a service.

Mainly used by developers to build and deploy their applications.

Examples: Windows Azure, Google App Engine, VMware Foundry, Heroku.

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PaaSPaaSBenefits:

Fast and cost-effective application development and delivery.

Deliver new applications to markets via web browsers.

Users pay only for what they use.

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Windows AzureWindows Azure

Private Cloud

Public Cloud

Hybrid Cloud

TypesTypes

Built for the exclusive use of one client, providing the utmost control over data, security, and Quality of Service (QoS).

Built and managed by a company’s own IT professionals or by a cloud provider.

Private CloudPrivate Cloud

A cloud vendor makes all the resources like applications and storage available to general public over the Internet.

Run by third party.

Hosted away from customer premises.

Public CloudPublic Cloud

Combines both public and private cloud.

Ability to augment a private cloud with the resources of a public cloud.

Hybrid CloudHybrid Cloud