CLOUD COMPUTING

Cloud computing

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What is cloud computing ?

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# Cloud computing is internet based development and use of computer technology.

# The term cloud used as a metaphor for the internet, based on the cloud drawing use to depict the internet in computer network

# Cloud computing is a term use for hosted service delivered over the internet.


The cloud service had three distinct characteristics which differentiate it from traditional hostings :

1.It is sold on demand – typically by the minute or the hour.

2.It is elastic in terms of usage a user can have as much or as little of a service as he/she wants at any given time.

3.The service is fully managed by the provider a user just needs PC and internet computing.

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Why cloud computing ?

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1.Application and data can be accessed from anywhere at any time. Data may not be held on hard drive on one user’s computer.

2.It could bring hardware costs down.one would need the internet connection.

3.Organization do not have to buy a set of software or software licence for every employee and the organizations organize could pay a metered fee to a could computing company.

4.Organizations do not have to rent a physical space to store severs and databases. Serves and digital storage devices take a space. Cloud computing gives the option of storing data on someone else’s hardware thereby removing the need for physical space front end.

5.Organization would be able to save money on IT support because organization will have to insure about the desktop (e.g. client) and continuous internet connectivity instaed of servers and other hardware.

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Deployment models 

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# Private

# Public 

# Hybrid

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Private or public cloud computing

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# The cloud computing services can be either private or public. A public cloud sell services to anyone on the internet .

# A private cloud is like a proprietary network or data center that supplies the hosted services to a limited number of people .

# When a services provider uses public cloud resources to create a private cloud, the result is called a “virtual private cloud” the goal of cloud computing is to provide easy, scalable access to the computing resources and IT services.

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Cloud computing services providers

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# Amazon : it offers flexible, simple and easy computing environment in the cloud that allows development of application.

# 3Tera : www.3tera.com

# Force.com : www.salesforce.com : its allows building of core business application

# Microsoft Live mesh : www.mesh.com : onedrive

# AppNexus : www.appnexus.com

# googleApp engine : www.google.com : free setup that allows user to use. 

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Types of services

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# Infrastructure as a services (laas) : it is like amazon web services that provide victual services with unique ip addresses and blocks of storage on demand. Customers benefit from an application programmable interface (API) from which they can control their services.. As customers can pay for exactly the amount for services they use, like for electricity or water, this services is also called utility computing.

# platform as a services (paas) : it is a set of software and development tools hosted on the provides servers. Developers can create applications using the providers APIs. Google app is one of the most famous “Paas” provides. Developers should take notices that there are not any interoperability standards. Therefore, some provides may not allows you to take your application and put it on another platform.

# Software as a services(saas) : it is the broadest market. In this case, the providers allow the customers only to use it’s application. The software interact with the user through a user interface. These application can be anything from web based e-mails to applications such as twitter or last.fm. 

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Why security needed in cloud computing ?       

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# The growing popularity of cloud computing and virtualization among organizations have made its possible the next target of cyber criminals. Cloud computing service, while offering considerable benefits and costs savings, move servers outside the organizations security perimeter, which makes its easier for cyber criminal to attack this systems.

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