26-10-2016, 03:56 PM
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HISTORY:
* Concept evolved in 1950 (IBM) called RJE( Remote Job Entry Process ).
* In 2006 Amazon provided first cloud AWS( Amazon Web Services ).
WHAT IS CLOUD COMPUTING?
Distributed computing on internet or delivery of computing service over the internet.
Ex : Yahoo! , Gmail , Hotmail.
Instead of running an e-mail program on your computer, you log in to Web e-mail account remotely. The software and storage for your account doesn’t exit on your computer - it’s on the service computer cloud.
Introduction:
* CLOUD computing presents a new way to supplement the current consumption and delivery model for IT services based on the internet.
* While enjoying the convenience brought by this new technology, users also start worrying about losing control to their own data.
* In the context of cloud , accountability is a set of approaches to addresses two key problems.
* Lack of consumer trust in cloud service providers
* Emphasis is on data protection , but the notion of accountability encompasses more than just privacy
USES:
* Helps to use application without installation.
* Access the personal files at any computer with internet
* This technology allows much more efficient computation
by centralizing storage memory , processing and bandwidth.
BENEFITS OF CLOUD:
* Reduce spending on technology
* Globalize your work force on the cheap
* Reduce capital cost
* Improve accessibility
* Improve flexibility
* Less personal training is needed
* Monitor project more effectively
* Achieve economic of scale
Cloud Computing Basics:
The use of the word “cloud” tries to describe the two essential concepts, namely
Abstraction : The absolute details of system implementation are hidden from users and developers, the applications are run on physical systems that aren’t specified, and administration of such systems is outsourced to others, data is stored in locations that are unknown, and access by users is ubiquitous.
Virtualization : Systems are virtualized by pooling and sharing of resources. Storage can be provided as needed from a centralized infrastructure, costs are assessed and levied with a pay-as-you-use model, multiple tenants are allowed, and resources are scalable with appreciable agility.
CLOUD COMPONENTS:
It has three components
1) Client computers
2) Distributed servers
3) Data centers
Client
Clients are the device that the end user interact with cloud.
Three types of clients:
1)Mobile
2)Thick
3)Thin (Most popular)
DISTRIBUTED SERVERS:
Often servers are in geographically different places, but server acts as if they are working next to each other.
DATA CENTER
It is a collection of servers where application is placed and is accessed via internet.
APPLICATION:
Social networking sites.
e-mail sites.
Search Engines.
Many more Services OVER THE INTERNET.
Why cloud service is popular?
Reduce the complexity of networks.
Do not have buy software licences.
Customization.
Cloud providers that have specialized in a particular area ( such as e-mail ) can bring advanced services that a single company might not be able to afford on develop.
Scalability , reliability , and efficiency.
Info.at cloud are not easily lost
Service Models
SAAS(software as a service): Required software , operating system & network is provided.
PAAS(platform as service): Operating system and network is provided.
IAAS(Infrastructure as a service): Just network is provided.
SAAS
Where off-the-shelf applications are accessed over the Internet
PASS
Allows users to create their own cloud applications using supplier-specific tools and languages
LAAS
Allows users to run any applications they please on cloud hardware of their own choice
Cloud services models
Commonly known as the SPI Model, the universally accepted services model are:
Software as a service : SAAS is a complete operating environment with provisioned applications, management, and the user interfaces.
Platform as a service : PAAS provides virtual machines, operating systems, applications, services, development frameworks, transaction, and control structures.
Infrastructure as a service : IAAS provides virtual machines, virtual storage, virtual infrastructure, and other hardware assets as resources that clients can prevision.
Advantages:
Storage and scalability:
No more infrastructure investments or time spent adding new servers –none of that mess. With the cloud, you basically have access to unlimited storage capability and scalability.
Backup and recovery:
Those days of tape back-up are long gone. Most cloud providers across service types and platform offer comprehensive backup and recovery capabilities.
Mobility:
your cloud , anywhere. Whether it’s your development platform , suit of office tools or custom content management system- cloud mobility enables access anywhere with a web connection(just about).
Cost efficiency:
Aside from storage and infrastructure costs , just think about all the other costs you can minimize with cloud service – updating and managing software or applications , training new staff and even decreased on-site energy costs.
IT innovation
probably the most understand benefit of the cloud – it is reshaping IT into a proactivity innovative bunch that focuses a lot less on manual system administration , and a lot more on improving the technology.
Disadvantages:
Control and Reliability:
The biggest fear of cloud computing its found in its major benefit – the ability to outsource the IT burden to a specialized vendor or provider.
Security and Compliance:
Security can also be a concern in the cloud , particularly if you manage confidential date like customer information.
Compatibility:
Making sure every existing tool , software and computer is compatible with the web based service , platform or infrastructure.
Unpredicted costs:
Sure , the cloud can substantially reduce staff and hardware costs, but the price cloud end up being more than you bargained for.
Contracts and Lock-Ins:
Traditional IT cloud be downsized , upsized , contracted-in and otherwise controlled by you. On-site hardware, software, infrastructure and platform always carried some obligations, but now the cloud service provider, for the most part, has all the decisions power.
Private Cloud
The private cloud’s infrastructure operated for the exclusive use of an organization. The clouds can be managed by that organization or a third party. Private clouds may be either on- or off- premises.
Public cloud
The public cloud infrastructure is available for public use alternatively for a large industry group and is owned by an organization selling cloud services .
Hybrid Cloud
A hybrid cloud combines multiple clouds (private ,community or public ) where those individual clouds retain their unique identities , but are bound together as a unit.
A hybrid cloud offers standardized or proprietary access to data and application, as well enables and enhances application portability.
Cloud computing features:
The following are an ideal cloud computing model’s features , which will help you to access the value proposition of a cloud.
Elasticity : you have the ability to right-size resources as required by your application.
Scalability : you have access to unlimited computer resources as needed, because the cloud provides infinite resource pool.
Utility model : A pay-as-you-use model matches resources to your need on a continuous basis, which eliminates the wastage of founds and has the most powerful added advantage of shifting risk from the client to the service provider.
Low barrier entry : Gaining access to systems is cheaper than ever, and only requires for a small investment.
CONCLUSION:
Fog computing advantage for service in several domains, such as Smart Grid, wireless sensor networks, Internet of Things and software defined networks (SDNs). We examine the state-of-the-art and disclose some general issues in Fog computing including security, privacy, trust, and service migration among for devices and between Fog and cloud.