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Uploaded byAli Bahu
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Cloud computing

Cloud computing is the delivery of computing resources such as hardware and software over a network. It allows consumers to access applications from anywhere via the internet. There are different types of cloud computing including Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). Cloud services can be deployed in private, public, community or hybrid models. Major companies delivering cloud services include Google, Microsoft, Amazon, Apple and Salesforce.

Technology◦
Ali Bahu 09/24/2012 CLOUD COMPUTING
INTRODUCTION  Cloud computing is the use of both hardware and software resources that are delivered as a service over a network.  The name cloud computing comes from the cloud-shaped symbol that is used to represent the complex infrastructure of the system design.
TYPES OF CLOUD COMPUTING  Infrastructure as a service (IaaS)  Platform as a service (PaaS)  Software as a service (SaaS)  Storage as a service (STaaS)  Security as a service (SECaaS)  Data as a service (DaaS)  Test environment as a service (TEaaS)  Desktop as a service (DaaS)  API as a service (APIaaS)
INFRASTRUCTURE AS A SERVICE  Consumers control and manage the systems in terms of the operating systems, applications, storage, and network connectivity, but do not themselves control the cloud infrastructure.
PLATFORM AS A SERVICE  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.
SOFTWARE AS A SERVICE  Consumers purchase the ability to access and use an application or service that is hosted in the cloud.
CHARACTERISTICS  API  Agility  Cost  Security  Maintenance  Virtualization  Performance  Scalability & elasticity  Device & location independence
CHALLENGES  Lack of Standards  Security and Privacy  Continuously Evolving  Compliance Concerns
DEPLOYMENT MODELS  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. The operation may be in-house or with a third party on the premises.  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.  Hybrid Cloud: The cloud infrastructure consists of a number of clouds of any type, but the clouds have the ability through their interfaces to allow data and/or applications to be moved from one cloud to another. 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.
PUBLIC, PRIVATE & HYBRID DEPLOYMENT
COMMUNICATIONS IN THE CLOUD  Web APIs: Accessing communications capabilities in a cloud-based environment is achieved through APIs, primarily Web 2.0 RESTful APIs, allowing application development outside the cloud to take advantage of the communication infrastructure within it.  Media Server Control Interfaces  Communications Services
COMPANIES DELIVERING CLOUD SERVICES  Google  Microsoft  Amazon  Apple  Salesforce