Outline of the Talk
• Introduction to Cloud Computing
• Demonstration of Cloud capabilities
• Infrastructure as a Service
• Platform as a Service
• Software as a Service
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Introduction to Cloud Computing
A cloud is an amalgamation of hardware, networks, storage, services, and interfaces that helps in
distributing computing as a service. It has broadly three users which are end user, business management
user, and cloud service provider. The end user is the one who uses the services provided by the cloud. The
business management user in the cloud takes the responsibility of the data and the services provided by
the cloud. The cloud service provider is the one who takes care or is responsible for the maintenance of
the IT assets of the cloud. The cloud acts as a common centre for its users to fulfil their computing needs.
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Cloud computing is a method of accessing numerous servers by an electronic device with digital network
such as WAN or any internet connection. Cloud computing is the future of information technology. It
embodies all the big trends in the design and use of computer architectures. And it ties closely to other
trends such as big data and the "Internet of things."4
BenefitsThere are numerous benefits of cloud computing including data backup and storage
of data, powerful server capabilities, software as a service known as (SaaS) etc.
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Private V/S Public Clouds
The Cloud, apart from its different layers, is also visible through three alternates.
There are the public Clouds for instance, a deployment option for initiatives where
the infrastructure services are provided by a hosting partner. It is this third party
dealer that hosts and manages these offerings.The other version is the private Cloud, where it is deployed within the initiatives and
managed and maintained by the organization itself. A private cloud is a collection of
virtualized infrastructure textiles that are coupled with automated management. It is
deeply integrated with the application platform and identity, protection and access
technologies to create an internal service-oriented environment for initiatives.
Although the private cloud does not offer advantages with the hypervisor capability
becoming integral to the operating system, it is becoming increasingly affordable for
initiatives. 6
A more recent, new concept in Cloud computing is the hybrid Cloud, which is a blend of the public
and private Cloud. The hybrid Cloud, created by the enterprise, can influence the benefits provided
by both public and private Clouds. However, issues related to the sharing of responsibilities
between the enterprise and the third party vendor and governing such a Cloud, make it a slightly
complex deployment option.7
Cloud Computing Layers
To understand Cloud computing, we need to understand in details about the three
layers of cloud computing. They are:
• Infrastructure-as-a-Service (IaaS)
• Platform-as-a-Service (PaaS)
• Software-as-a-Service (SaaS)8
Infrastructure as a Service
This layers is also called as Infrastructure service layer. In the instance of IaaS,
servers, network devices, and storage disks are made available to groups as services
on a need-to basis. Virtualization, allows IaaS providers to offer almost unlimited
requests of servers to clients, while making cost-effective use of the hosting
hardware.
Companies can use IaaS to build new versions of without having to invest in physical
IT assets. Increasingly, organizations are using IaaS to host their websites, monitor
their traffic and keep them running, without monopolizing up IT resources. IaaS is
particularly beneficial for micro, small and medium-sized businesses that can access
server and storage systems, which they would otherwise have to purchase.
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Some of the key concepts of IaaS include:
• Cloud bursting
• Multi-tenant computing
• Resource pooling
• The hypervisor
Most importantly, the two primary facets that make IaaS special: elasticity and
virtualization.10
Platform-as-a-Service This layers is also called as Platform layer. This layer provides a platform for
creating applications. PaaS solutions are fundamentally developed platforms for
which the development tool itself is hosted in the Cloud and retrieved through a
browser. With PaaS, developers can build Web applications without installing any
tools on their computers and then deploy those applications without any generalized
systems administration skills.
Today, PaaS is being delivered like a utility over the Internet, with corporate IT
departments, paying according to usage. Owing to PaaS, there has been a barrier in
the number of people who can develop, maintain and deploy web-based applications
without requiring specialized skills.11
The defining factor that makes PaaS unique is that it lets developers build and
deploy web applications on a hosted infrastructure. In other words, PaaS allows you
to leverage the seemingly infinite compute resources of a cloud infrastructure.12
Software-as-a-Service
This layers is also called as Application layer. This layer includes applications that run off the Cloud and are
available to Web users on anytime and on anywhere basis. Explore the four primary factors that drive
return on investment for Software as a Service developers and how those factors are leveraged to make
SaaS profitable for stakeholders. In this final article of a three-part series, discover the business model
opportunities that SaaS presents and gain insight into the role of user experience design for SaaS
applications.13
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