Cloud computing

What Is Cloud Computing:•

Technology that uses the
internet and central remote
servers to maintain data and
applications.
• Allows consumers and
businesses to use
applications without
installation and access their
personal files at any
computer with internet
access.
• This technology allows for
much more efficient
computing by centralizing
storage, memory,
processing and bandwidth.
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Example of Cloud Computing:-


Autonomic computing refers to
the self-managing characteristics
of distributed computing
resources, adapting to
unpredictable changes while
hiding intrinsic complexity to
operators and users.

The client–server model is a
distributed application structure
in computing that partitions tasks
or workloads between the
providers of a resource or
service, called servers, and
service requesters, called clients.

Grid computing is the collection of
computer resources from multiple
locations to reach a common goal.
The grid can be thought of as a
distributed system with noninteractive workloads that involve a
large number of files.

Mainframe: a large digital
computer serving 100-400
users and occupying a
special air-conditioned room.

Utility computing is the packaging of
computing resources, such as
computation, storage and services,
as a metered service.
This model has the advantage of a
low or no initial cost to acquire
computer resources; instead,
computational resources are
essentially rented.

Denoting networks in which
each computer can act as a
server for the others, allowing
shared access to files and
peripherals without the need for
a central server.

Classification of Cloud on the
basis of service provided


Software as a service (SaaS)
This is the most common
form of cloud computing
which we see in action. It is a
complete software offering
on the cloud. They are
accessed by the customers
on pay per use basis.
Example:Gmail , Hotmail etc


Platform as a service (PaaS)
•

The consumer creates
the software using tools
and libraries from the
provider.
•
The consumer also
controls software
deployment and
configuration settings.
•
The provider provides
the networks, servers and
storage .
•
Example:Dreamweaver,JDK,NET
etc.

Infrastructure as a service
(IaaS)
Hardware related services
are provided using the
principles of Cloud
Computing.
These include disk storage
and virtual servers.
Amazon EC2, Amazon S3,
Rackspace Cloud Servers
are some of the leading
vendors.


Cloud Computing classified
basis of location
•
•
•
•

Public Cloud
Private Cloud
Hybrid Cloud
Community Cloud


Public Cloud
•

Computing
infrastructure is hosted at
the vendor’s premises.
• The customer has
no visibility over the
location of the cloud
computing infrastructure.
• The computing
infrastructure is shared
between organizations.


Private Cloud
• Computing architecture
is dedicated to the
customer and is not
shared with other
organizations.
• Private clouds may be
externally hosted ones
as well as in premise
hosted clouds.


Hybrid Cloud
•

Organizations host
some critical, secure
applications in private
clouds. The not so
critical applications
are hosted in the
public cloud.
• The combination is
known as Hybrid
Cloud.

Community Cloud
The
cloud infrastructure
is shared between
the organizations of
the same
community.

Advantages:• Can be less expensive compared to buying
software and hardware.
• Can be used from any computer or device with
an Internet connection.
• The device does not need as large of an internal
storage system.
• Compatible with most computers and operating
systems.
• Updates occur across the service.

Disadvantages:• Security & Privacy
• Dependency (loss of
control)
• Cost
• Decreased flexibility
• Knowledge And
Integration


Cloud computing

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