Cloud Computing

Cloud Computing

A shift paradigm of 21st century

Definition

Cloud computing centers around the concept of sharing computing resources rather than having local servers or personal devices handle applications. Clouds can be public, available to anyone or organization that wishes to use it, private, located in an organization’s data center or off premise, or a combination of the two known as a hybrid.

Fundamental service models

IaaS Infrastructureas-a- Service PaaS

Platform -as-aService

SaaS Software -as-aService

Provides processing, storage, networking and other fundamental computing resources. Customers do not manage the underlying infrastructure, they do manage operating systems, applications and data.

Allows the customer to develop his own applications using programming tools and utilities supported by the provider.

The customer uses the provider’s software that is running on a cloud infrastructure and that is typically accessed using a web browser.

Cloud Computing

Benefits of cloud computing

That the market is moving toward cloud model is undeniable. Cloud services offer a huge business opportunity and benefits such as

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reducing deployment and maintenance costs for software and hardware agility, increasing scalability and availability

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Cloud challenges

How rapidly cloud services will be adopted will depend on various things. There are open issues that surround the use of software services from the cloud. These according to John Grundy and his colleagues from Swinburne University of Technology are: • Gathering Software • Development methods for requirements engineering cloud services

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Software architecting and design Testing Ensuring quality attributes (security)

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Project management approaches for cloud services and applications Cloud deployment

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Security issues

Cloud users face security threats from inside and outside the cloud: External threats like side channel attacks(attacks...