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Introduction of Cloud
computing
by Santosh Kumar
1/7/2017Introduction of cloud computing by Santosh Kumar

What is Cloud Computing?
? Distributed computing on internet Or delivery of computing service over the
internet. Eg: Yahoo!, GMail, HotmailInstead of running an e-mail program on your
computer, you log in to a Web e-mail account remotely. The software and storage
for your account doesn't exist on your computer -- it's on the service's computer
cloud.
? The term Cloud refers to a Network or Internet. In other words, we can say that
Cloud is something, which is present at remote location. Cloud can provide
services over network, i.e., on public networks or on private networks, i.e., WAN,
LAN or VPN. Applications such as e-mail, web conferencing, customer relationship
management (CRM), all run in cloud.
? Cloud Computing refers to manipulating, configuring, and accessing the
applications online. It offers online data storage, infrastructure and application.
Cloud Computing is both a combination of software and hardware based computing
resources delivered as a network service.

Introduction
? Cloud Computing provides us a means by which we can access the applications
as utilities, over the Internet. It allows us to create, configure, and customize
applications online. With Cloud Computing users can access database
resources via the internet from anywhere for as long as they need without
worrying about any maintenance or management of actual resources.

History
? Concept evolved in 1950(IBM) called RJE (Remote Job Entry Process).
? In 2006 Amazon provided First public cloud AWS(Amazon Web Service).

Cloud Computing Architecture

Basic Concepts
? There are certain services and models working behind the scene making the
cloud computing feasible and accessible to end users. Following are the
working models for cloud computing:
1. Deployment Models
2. Service Models

Deployment Models
? Deployment models define the type of access to the cloud, i.e., how the
cloud is located? Cloud can have any of the four types of access:
? Public
? Private
? Hybrid
? Community

? PUBLIC CLOUD: The Public Cloud allows systems and services to be easily
accessible to the general public. Public cloud may be less secure because of
its openness, e.g., e-mail.
? PRIVATE CLOUD : The Private Cloud allows systems and services to be
accessible within an organization. It offers increased security because of its
private nature.
? COMMUNITY CLOUD: The Community Cloud allows systems and services to be
accessible by group of organizations.
? HYBRID CLOUD: The Hybrid Cloud is mixture of public and private cloud.
However, the critical activities are performed using private cloud while the
non-critical activities are performed using public cloud.

Service Models
? Service Models are the reference models on which the Cloud Computing is
based. These can be categorized into three basic service models as listed
below:
1.Infrastructure as a Service (IaaS)
2. Platform as a Service (PaaS)
3. Software as a Service (SaaS)

Infrastructure as a Service (IaaS)
? IaaS is the delivery of technology infrastructure as an on demand scalable
service.
? IaaS provides access to fundamental resources such as physical machines,
virtual machines, virtual storage, etc.
?Usually billed based on usage
?Usually multi tenant virtualized environment
?Can be coupled with Managed Services for OS and application support

Platform as a Service (PaaS)
? Platform as a Service (PaaS) PaaS provides the runtime environment for
applications, development & deployment tools, etc.
? PaaS provides all of the facilities required to support the complete life cycle
of building and delivering web applications and services entirely from the
Internet. Typically applications must be developed with a particular platform
in mind
?Multi tenant environments
?Highly scalable multi tier architecture

Software as a Service (SaaS)
? Software as a Service (SaaS) SaaS model allows to use software applications as
a service to end users.
? SaaS is a software delivery methodology that provides licensed multi-tenant
access to software and its functions remotely as a Web-based service.
? Usually billed based on usage
? Usually multi tenant environment
? Highly scalable architecture

Advantages
? Lower computer costs
? Improved performance:
? Reduced software costs
? Instant software updates
? Improved document format compatibility
? Unlimited storage capacity
? Increased data reliability
? Universal document access
? Latest version availability
? Easier group collaboration
? Device independence

Disadvantages
? Requires a constant Internet connection
? Does not work well with low-speed connections
? Features might be limited
? Can be slow
? Stored data can be lost
? Stored data might not be secure

Cloud Storage
? ? Create an Account User name and password.
? ? Content lives with the account in the cloud.
? ? Log onto any computer with Wi-Fi to find your content

Thank
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