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Cloud computing..

Cloud computing..



What is cloud computing ??

What is cloud computing ??



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    Cloud computing.. Cloud computing.. Presentation Transcript

    • Contents • Introduction • Why Cloud? • History of Cloud • Evolution of Cloud • Definition of Cloud • Cloud Models • Pros and Cons • Security Issues • Summary • References • Query
    •  The spread of high-speed broadband networks in developed countries, the continual increase in computing power, and the growth of the Internet have changed the way in which society manages information and information services.
    • Why Cloud?
    • Imagine the absence of a power grid throughout the nation, necessitating the presence of a  generator in every home for producing electricity. Well, why do we have our computers filled with software we use occasionally? Wouldn’t it be meaningful to use software the same way we use electricity – as and when we need it? This was the defining thought behind cloud computing.
    •  In 1960, J.C.R. Licklider is person who brought the idea of cloud computing to the forefront. In 1961, John McCarthy suggested in a speech at MIT that computing can be sold like a utility, like electricity/water. In 1997, Ramnath Chellappa – first known academic use of the term “Cloud Computing”  In 1999, Salesforce started delivering applications to users using a simple website. In 2002, Amazon started Amazon Web Services, providing services like storage, computation and even human intelligence. However, the launch of the Elastic Compute Cloud in 2006, open to everybody existed. In 2009, Google Apps, Microsoft Windows Azure, and companies like Oracle and HP have all joined the game.
    •  Common  Location Independent  Online   Utility (that is available on)  Demand simplifies the meaning of CLOUD - (Chan, 2009).
    •  The Cloud delivers a hosting environment that is immediate, flexible, elastic, scalable, secure, and available – while saving money, time and resources • Instead of hosting apps and data on an individual desktop computer, everything is hosted in the "cloud"— an assemblage of computers and servers accessed via the Internet.
    •  SaaS - 'Software as a Service', describes when users 'rent' or borrow online software instead of actually purchasing and installing it on their own computers.   Instead of selling you a copy of Microsoft Word for $300, a cloud computing model would "rent" word processing software to you through the Internet for $5 a month. You would not install any special software to your home machine to use this rented online product. You simply use your modern web browser to login from any web-enabled computer, and you can access your word processing documents in the same way that you would access your Gmail.
    •  PaaS (Platform as a service), as the name suggests, provides you computing platforms which typically includes operating system, programming language execution environment, database, web server etc.  Examples : AWS Elastic Beanstalk, Heroku, Force.com, Google App Engine.
    •  IaaS(Infrastructure as a service), as the name suggests, provides you the computing infrastructure, physical or virtual machines and other resources like virtual- machine disk image library, block and file-based storage, firewalls, load balancers, IP addresses, virtual local area networks etc.  Infrastructure as a Service (IaaS) describes one of the three main methods of accessing cloud computing based services. Organisations rent computing power and disk space and access them from desktop PCs through a private network or across the internet.  Examples : Amazon EC2, Windows Azure, Rackspace.
    •  Public cloud -- The cloud infrastructure is made available to the general public or a large industry group and is owned by an organization selling cloud services.  Public cloud services may be free or offered on a pay-per-usage model. Benefits Easy and inexpensive set-up because hardware, application and bandwidth costs are covered by the provider. No wasted resources because you pay for what you use.  Examples Amazon Elastic Compute Cloud (EC2), IBM's Blue Cloud, Sun Cloud, Google AppEngine and Windows Azure Services Platform.
    •  Private cloud -- The cloud infrastructure is operated solely for an organization. It may be managed by the organization or a third party and may exist on premise or off premise.  A private cloud can increase efficiency, decrease costs and offer more security than a public cloud.  Examples Eucalyptus, Elastra, VMware and Windows Azure Services Platform.
    •  Hybrid cloud -- The cloud infrastructure is a composition of two or more clouds (private, community, or public) that remain unique entities but are bound together by standardized or proprietary technology that enables data and application portability (e.g., cloud bursting for load- balancing between clouds).  Government departments, universities, central banks etc. often find this type of cloud useful. Examples Google Apps for Government, Microsoft Government Community Cloud
    •  Community cloud -- The cloud infrastructure is shared by several organizations and supports a specific community that has shared concerns (e.g., mission, security requirements, policy, and compliance considerations).  The goal of a community cloud is to have participating organizations realize the benefits of a public cloud -- such as multi-tenancy and a pay-as-you-go billing structure -- but with the added level of privacy, security and policy compliance usually associated with a private cloud. The community cloud can be either on-premises or off- premises, and can be governed by the participating organizations or by a third-party managed service provider
    •  Cloud computing requires an intricate interaction with the hardware which is very essential to ensure uptime of the application. It is very helpful to divide the cloud model into two sections, one is front end and other is backend.  They are connected via a network and mostly internet is used for fulfilling the requirement. The front side is the interface for the user and the back end is the cloud section for the whole system.
    • Data Migration/Mobility  It is the process of moving or transferring data, application from your machine to cloud and vice- versa. Moving to the cloud or between cloud environments presents the usual IT issues, but the problems are compounded by having data stored and managed remotely, by external organizations and often in multiple locations.  Cloud disaster recovery and backup options have become more common, and some users say they provide a higher level of protection than traditional solutions -- at lower cost
    • Performance metrics  How fast is the cloud server’s vCPU?  How quickly do memory and disk respond?  What is the actual network throughput? Naturally, cloud providers offer systems that are different "sizes" with regard to power and price. Offerings typically have two key dimensions: CPU and memory (RAM). Supplier’s own privacy & security policies. What are the supplier’s own procedures and policies? Do they include physical security? What about removal of data from premises on removable media? Does the supplier have an understanding of the role of the applicable privacy regulatory authorities, and procedures to respond to enquiries and complaints?
    • Privacy and data control issues are significant in the context of cloud computing services. Access controls Who will have access to the data (including individuals or roles)? Are there access audit trails? If there are particular individuals who will have access to significant amounts of data (for example, database administrators) how is their access monitored and managed? Are any subcontractors involved? How is their access controlled? Is data encrypted on disk? “in flight”? Who holds access keys?
    •  Secure Data Transfer  Secure Stored Data  Secure Software Interface  User Access Control  Data Separation
    • Cloud computing services often provide common business application online that are accessed from a web browser, while the software and data are stored on the servers. Cloud computing is an umbrella term used to refer to Internet based development and services Cloud computing defines virtual storage area which is provided by cloud providers and accessed by clients on demand and pay per use. Today, security is one of the most important factors in computing environment. Cloud service providers must provide trust worthy environment. End users must know about the awareness of security policy.
    •  [1] Bhushan Lal Sahu, Rajesh Tiwari, “A comprehensive study on Cloud computing”, International journal of Advanced Research in Computer science and Software engineering, volume 2, issue 9, September 2012, ISSN: 2277 128X.  [2] Mladen A. Vouk, “Cloud computing – Issues, Research and Implementations”, Journal of Computing and Information technology, CIT 16, 2008, 4, 235-246.  [3] Anbalagan K., “Cloud computing”, National seminar on Imminent Trends in Advanced Computing and Technology – ITIACT’ 13, ISBN: 978-81-924922-3-0.