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- Cloud Computing: SaaS, PaaS, IaaS, Virtualization, Business Models, Mobile, Security and More
- Cloud computing: A study of infrastructure as a service (IAAS)
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Cloud Computing: SaaS, PaaS, IaaS, Virtualization, Business Models, Mobile, Security and More
Reema Ajmera Asst. It lets organizations ramp up new services and reallocate computing resources rapidly, based on business needs. It gives users self-service access to computing resources, while maintaining appropriate levels of control. And, done right, it provide the means to manage across hybrid computing environments, both on- and off-premise, based on cost, capacity requirements, and other factors. This paper aims to provide a means of understanding cloud services, solutions, benefits and challenges of cloud computing.
Virtualization, Multitenancy I. Cloud services allow individuals and businesses to use software and hardware that are managed by third parties at remote locations. Cloud services include online file storage, social networking sites, webmail, and online business applications. The cloud computing model allows user to access information and computer resources remotely with an available network connection i.
Cloud computing provides a shared pool of resources, including data storage space, networks, computer processing power, and specialized corporate and user applications. The following definition of cloud computing has been developed by the U. National Institute of Standards and Technology NIST : Cloud computing is a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources e.
Forrester defines cloud computing as: A pool of abstracted, highly scalable, and managed compute infrastructure capable of hosting end-customer applications and billed by consumption. Cloud computing is not a revolutionary idea; Instead, it is an evolutionary concept that integrates various existing technologies to offer a useful new IT provisioning tool.
This eliminated periods of inactivity on the mainframe and allowed for a greater return on the investment and work. The practice of sharing CPU time on a mainframe became known in the industry as time-sharing. By switching traffic as they saw fit to balance server use, they could use overall network bandwidth more effectively and effectivly.
They began to use the cloud symbol to denote the demarcation point between what the provider was responsible for and what users were responsible for. Cloud computing extends this boundary to cover servers as well as the network infrastructure. Amazon initiated a new product development effort to provide cloud computing to external customers, and launched Amazon Web Services AWS on a utility computing basis in In early , Eucalyptus became the first open-source, AWS API-compatible platform for deploying private clouds.
In the same year, efforts were focused on providing quality of service guarantees as required by real-time interactive applications to cloud-based infrastructures, in the framework of the IRMOS European Commission-funded project, resulting to a real-time cloud environment. By mid, Gartner saw an opportunity for cloud computing "to shape the relationship among consumers of IT services. The expression cloud is commonly used in science to describe a large agglomeration of objects that visually appear from a distance as a cloud and describes any set of things whose details are not inspected further in a given context.
Meteorology: a weather cloud is an agglomeration. Mathematics: a large number of points in a coordinate system in mathematics is seen as a point cloud; Astronomy: a cloud of gas and particulate matter in space is known as a nebula Latin for mist or cloud , Physics: The indeterminate position of electrons around an atomic kernel appears like a cloud to a distant observer Cloud: In analogy to above usage the word cloud was used as a metaphor for the Internet and a standardized cloud-like shape was used to denote a network on telephony schematics and later to depict the Internet in computer network diagrams and resources hardware.
The cloud symbol was used to represent the Internet as early as , in which servers were then shown connected to, but external to, the cloud. References to cloud computing in its modern sense can be found as early as , with the earliest known mention to be found in a Compaq internal document.
The term became popular after Amazon. Grid Computing "A form of distributed and parallel computing, whereby a 'super and virtual computer' is composed of a cluster of networked, loosely coupled computers acting in concert to perform very large tasks. Utility Computing The "packaging of computing resources, such as computation and storage, as a metered service similar to a traditional public utility, such as electricity. Participants are both suppliers and consumers of resources in contrast to the traditional client server model.
Cloud Gaming Also known as on-demand gaming, is a way of delivering games to computers. Gaming data is stored in the provider's server, so that gaming is independent of client computers used to play the game.
One such current example, would be a service by OnLive which allows users a certain space to save game data, and load games within the OnLive server. Some notable examples as of include the following: Google Has a private cloud that it uses for delivering many different services to its users, including access, document applications, text translations, maps, web analytics, and much more.
Microsoft Has Microsoft Sharepoint online service that allows for content and business intelligence tools to be moved into the cloud, and Microsoft currently makes its office applications available in a cloud. On-demand self service means that customers usually organizations can request and manage their own computing resources. Pooled resources means that customers draw from a pool of computing resources, usually in remote data centres. Services are made available over the network and accessed through standard mechanisms, typically lightweight web protocols.
Needs to be accessed across the internet from a broad range of devices such as PCs, laptops, and mobile devices, using standards-based APIs for example, ones based on HTTP . Deployments of services in the cloud include everything from using business applications to the latest application on the newest smartphones. This is done automatically using software automation, enabling the expansion and contraction of service capability, as needed.
This dynamic scaling needs to be done while maintaining high levels of reliability and security Rapid and elastic scaling Uses metering for managing and optimizing the service and to provide reporting and billing information. In this way, consumers are billed for services according to how much they have actually used during the billing period. Metering at a level of abstraction appropriate to the type of service e. The cloud infrastructure, regardless of deployment model, seeks to make the most of the available infrastructure across a number of users.
Services can be scaled larger or smaller; and use of a service is measured and customers are billed accordingly. Agility: improves with users' ability to re-provision technological infrastructure resources.
Application programming interface API : accessibility to software that enables machines to interact with cloud software in the same way that a traditional user interface e. Cost: cloud providers claim that computing costs reduce. A public-cloud delivery model converts capital expenditure to operational expenditure. This purportedly lowers barriers to entry, as infrastructure is typically provided by a third-party and does not need to be purchased for one-time or infrequent intensive computing tasks.
Pricing on a utility computing basis is fine-grained, with usage-based options and fewer IT skills are required for implementation in-house. Device and location independence: enable users to access systems using a web browser regardless of their location or what device they use e. As infrastructure is off-site typically provided by a third-party and accessed via the Internet, users can connect from anywhere.
Virtualization: technology allows sharing of servers and storage devices and increased utilization. Applications can be easily migrated from one physical server to another. Multitenancy : enables sharing of resources and costs across a large pool of users thus allowing for: centralization of infrastructure in locations with lower costs such as real estate, electricity, etc.
Reliability: improves with the use of multiple redundant sites, which makes well-designed cloud computing suitable for business continuity and disaster recovery.
Performance: is monitored, and consistent and loosely coupled architectures are constructed using web services as the system interface. Security: can improve due to centralization of data, increased security-focused resources, etc. Security is often as good as or better than other traditional systems, in part because providers are able to devote resources to solving security issues that many customers cannot afford to tackle.
However, the complexity of security is greatly increased when data is distributed over a wider area or over a greater number of devices, as well as in multi-tenant systems shared by unrelated users. Maintenance of cloud computing applications is easier, because they do not need to be installed on each user's computer and can be accessed from different places. Broad network access, Capabilities are available over the network and accessed through standard mechanisms that promote use by heterogeneous thin or thick client platforms e.
Resource pooling, The provider's computing resources are pooled to serve multiple consumers using a multi-tenant model, with different physical and virtual resources dynamically assigned and reassigned according to consumer demand. Rapid elasticity, Capabilities can be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand.
To the consumer, the capabilities available for provisioning often appear unlimited and can be appropriated in any quantity at any time. Measured service, Cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service e.
Resource usage can be monitored, controlled, and reported, providing transparency for both the provider and consumer of the utilized service. This is widely known as as a service. Once a cloud is established, how its cloud computing services are deployed in terms of business models can differ depending on requirements. Figure 1.
And same is done by SaaS as well. Big giants like Amazon, Salceforce are using all three in combination. Many new bees are also adopting this and proving their presence. The primary service models being deployed are commonly known as: Software as a Service SaaS Software s that is provided on demand for use is SaaS. Consumers purchase the ability to access and use an application or service that is hosted in the cloud.
A complete application is offered to the customer, as a service on demand. Microsoft is expanding its involvement in this area, and as part of the cloud computing option for Microsoft Office , its Office Web Apps are available to Office volume licensing customers and Office Web App subscriptions through its cloud-based Online Services. What is being provided is part operating system and part middleware. A proper PaaS provider takes care of everything needed to run some specific language or technology stack.
Consumers purchase access to the platforms, enabling them to deploy their own software and applications in the cloud.
The operating systems and network access are not managed by the consumer, and there might be constraints as to which applications can be deployed. The customer has the freedom to build his own applications, which run on the provider s infrastructure.
Google s App Engine, Force. It also known as HaaS, Hardware as a Service. IaaS provides basic storage and computing capabilities as standardized services over the network. Servers, storage systems, networking equipment, data centre space etc. The customer would typically deploy his own software on the infrastructure.
Some common examples are Amazon, GoGrid, 3 Tera, etc. Private Cloud The cloud infrastructure has been deployed, and is maintained and operated for a specific organization. The operation may be in-house or with a third party on the premises.
Community Cloud The cloud infrastructure is shared among a number of organizations with similar interests and requirements. This may help limit the capital expenditure costs for its establishment as the costs are shared among the organizations. Public Cloud The cloud infrastructure is available to the public on a commercial basis by a cloud service provider. This enables a consumer to develop and deploy a service in the cloud with very little financial outlay compared to the capital expenditure requirements normally associated with other deployment options.
This can be a combination of private and public clouds that support the requirement to retain some data in an organization, and also the need to offer services in the cloud. As shown in Figure , these components make up the three parts of a cloud computing solution.
Cloud computing: A study of infrastructure as a service (IAAS)
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Jamsa Published Computer Science. Cloud computing is changing the way businesses and users interact with computers and mobile devices. Gone are the days of expensive data centers, racks of disk drives, and large IT support teams. Save to Library. Create Alert.
These are the three main types of cloud computing. With uptake rates like these, cloud computing is becoming the norm, and many businesses are phasing out on-premise software altogether. Now, you can utilize the Cloud platform for nearly all your systems and processes. Most businesses use a combination of SaaS and IaaS cloud computing service models, and many engage developers to create applications using PaaS, too. IaaS gives users cloud-based alternatives to on-premise infrastructure, so businesses can avoid investing in expensive on-site resources.
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Embed Size px x x x x Cloud Computing presents a hands-on introduction to cloud technologies. By the end of Chapter 1 you will learn to use cloud-based data storage for storing personal documents,. If you can't read please download the document.
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