A Survey on Cloud Computing Pillars and Challenges
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International Journal of Applied Research 2015; 1(8): 254-258 ISSN Print: 2394-7500 ISSN Online: 2394-5869 A Survey on Cloud Computing Pillars and Challenges Impact Factor: 5.2 IJAR 2015; 1(8): 254-258 www.allresearchjournal.com Robin Kumar, Rajni Kant, Bhawani Sharma Received: 05-05-2015 Accepted: 08-06-2015 Abstract Robin Kumar Nowadays cloud computing is acquiring great deal of attention in users, markets, education and Assistant Professor, publications. Cloud is a group of servers that provide highly scalable services like SaaS, PaaS, IaaS to Department of Mathematics, transform computing in business. Information stored in clouds is accessible from anywhere at any time. A. S. College, Khanna, Punjab. Cloud providers have storage, software and infrastructure facilities to run businesses effectively. Cloud computing is a dominant technology that facilitates businesses to become more connective, scalable, Rajni Kant collaborative, real-time and productive. Cloud computing is based on the concept of virtualization and Assistant Professor, hence eliminates the need of a powerful configuration deployment by providing services at a reasonable Department of Economics, A. price and hence this technology is very helpful for small organizations that cannot afford the cost of S. College, Khanna, Punjab. infrastructure and storage space. This robust technology has shifted the cost of managing hardware, Bhawani Sharma software and computational infrastructure to third parties such as Google, Microsoft, Amazon. By Assistant Professor, shifting the costs of managing computational infrastructure to third parties, cloud computing has made Department of Computer it possible for individuals and small organizations to deploy world-wide services; all they need to pay is Science, R. K. Arya College, the marginal cost of actual resource usage. As all the data is being stored in clouds, security issues Nawanshahr, Punjab. should be addressed properly. All the organizations have concerns about security, privacy, residency, unauthorized access, interception, interruption, modification, fabrication and non-repudiation. Security system of clouds should not be vulnerable to unauthorized data manipulation. By effectively implementing the pillars of cloud computing security of data over clouds could be ensured. This paper describes pillars, service models, deployment models and challenges of cloud computing to provide a better and common understanding of the subject. Keywords: Cloud Computing, SaaS, PaaS, IaaS, Agility, Parallel, Distributed, Scalable, Modular, Service-Oriented 1. Introduction Cloud Computing has changed the way how people use technology without investing in new infrastructure facilities, training new personnel or procuring new software. Cloud is an impactful technology that provides on-demand access to computing resources at a marginal and predictable cost. Cloud computing is a recent dominant technological development widely accepted by organizations, educational institutions and individual users. Cloud computing adds a new dimension to business models by eliminating the need of a powerful physical configuration. Cloud computing allows consumers to use services like software, . platform and infrastructure as a supplement to consumer’s on-premises infrastructure without installation of costly hardware and software. Concept of cloud computing is same as accessing e-mails. Like e-mails, cloud services can be accessed with the help of Internet. Cloud computing is also an Internet-based service. Service providers of cloud process, manage and store the consumer’s data at a remote location. E-mail services provided by yahoo, gmail and rediffmail cloud service providers is a very simple and easily understandable example of cloud service. IT staff can spend valuable time on strategic activities rather than on routing maintenance of e-mail servers. E-mail management and storage is on the cloud, subscribers do not have e-mails on their personal computer rather they can access their e-mails with the help of an Internet connection. Internet connection is the only requirement which an organization need to have in order to access cloud. Correspondence: Consumers of cloud services are required to pay-as-per-usage not more than that. Cloud Robin Kumar Computing is an emerging technology that have a multiplying effect because it provides Assistant Professor, virtualized services like software, platform and infrastructure without physical installation of Department of Mathematics, costly hardware and software. Cloud computing is agile, distributed, modular, parallel, A. S. College, Khanna, Punjab. scalable, service-oriented and secure. ~ 254 ~ International Journal of Applied Research 2. Cloud Deployment Models services like operating system, server software, database A. Public Cloud management system, tools for design and development etc. Public clouds are available for general public. Public cloud’s to create scalable, service-oriented applications with lower infrastructure is available for all the subscribers having an investments. Examples of PaaS vendors are: Amazon EC2, Internet connection and access to cloud space. Public clouds Appistry, AppScale, AT&T, Engine Yard, Enomaly, are more vulnerable than private clouds. Level of efficiency FlexiScale, GCloud3, Gizmox, GoGrid, Google, LongJump, in resource sharing is highest in public clouds. A public Microsoft, Orange Scape, RackSpace, Salesforce.com, cloud does not mean that user’s data is accessible to all; Terremark, Ubuntu, Verizon etc. vendors of public clouds provide an effective access control mechanism to ensure the integrity of data. C. Infrastructure as a service (IaaS) IaaS providers offer services like storage, disaster recovery, B. Private Cloud remote access, backup, file sharing, resources and computing Private clouds are available solely for a single group or power to the customer on pay-per-usage basis. Amazon is the organization. Access to private cloud’s infrastructure is major player in this domain, it offers two products: EC2 limited to that particular group or organization. This (Elastic Compute Cloud) for computing resources and S3 deployment model is implemented solely for an organization (Simple Storage Services) for data storage. Cloud computing and is managed by either organization or third party. Level of provides highly scalable, virtualized, standardized, reliable, security is highest in private clouds. secure and dynamic infrastructure services to facilitate the working of small and large organizations that cannot afford C. Community Cloud the costly infrastructure. Organizations can focus on their Community clouds are shared by several organizations application logic rather than installing their own having similar cloud requirements such as security concerns, infrastructure services. In cloud computing, instead of fixed policies and facilities etc. Organizations having common resources, resources can grow—and shrink–dynamically as concerns opt for community clouds rather than using public requirements shift and the customers pay on the basis of pay- clouds or creating their private clouds. Management of per-usage. Examples of IaaS vendors are: AllenPort, community clouds is very complex. Amazon, AppZero, Boomi, Cast Iron, Citrix Cloud Center (C3), Elastra, IBM, Informatica, New Relic, Novell, D. Hybrid Cloud OpSource, RightScale, Stoneware, Carbonite, Ctera, IBM, Hybrid clouds are combinations of infrastructure of two or Intronis, Robobak, Symantec etc. more clouds that is private, public or community. Organizations may host critical applications with rigorous 4. Pillars of Cloud Computing security on private clouds and applications with less security Pillars are the foundational building blocks of cloud concerns on the public cloud. Hybrid clouds facilitate ― computing. If all the pillars of cloud computing are not cloud burstingǁ which means if an application of private implemented properly then that service cannot be considered cloud needs additional resources, it can use the resources of as cloud computing service. public cloud in case of peak load requirements. This resource sharing facilitates efficient utilization of resources among A. Dynamic Computing Infrastructure different clouds but increases the design complexity. Clouds should provide a standardized, scalable, robust and secure physical infrastructure in a virtualized manner. 3. Cloud Service Models Dynamic means resources should be allocated and released A. Software as a service (SaaS) as per the user’s requirements to match the traffic demand Software is delivered as a service to the customer, which curve. This rapid elasticity of cloud computing facilitates the makes it unnecessary to have a physical copy of the software resources to grow-and-shrink automatically as per the on all the devices of an organization. Some software services customer’s requirements. are free like Google, Hotmail while others are available on a subscription basis. Customers can have access to the B. On-Demand Self-Service software at all the times without worrying about deployment Cloud Computing has changed the way how people use and maintenance of software. In this type of service technology. Cloud computing technology provides customers have least control over the cloud. Examples of convenient on-demand access to a shared pool of resources SaaS vendors are: SAP, Birst, Cloudphysics, Databricks, without human intervention on the cloud service provider’s Hubspot, Netsuite, New Relic, Otixo, Qlik, Qubole, side. Users