An Insight into Cloud Computing Paradigm and Services

Cloud computing is a computing model which provides the computing services over the internet on pay-as-you-go basis. You can take the services on rent instead of building your own IT-which results in cost saving. In this paper, we have discussed the differences between traditional IT infrastructure and cloud computing. We have also discussed the benefits of cloud, risks associated with cloud computing and the cloud models.


I. INTRODUCTION
Cloud computing is the delivery of computing services like servers, storage, applications, databases, networks and so on anywhere, anytime over the internet. The services are provided by cloud service providers on pay-as-You have to pay only for the amount of services you use.
Why cloud Traditional software applications require in-house building and deploying of complex IT infrastructure. A team of professionals is required to manage this infrastructure. Hardware are prone to be updated very soon. Managing software installations and up gradations is a challenging task. To manage infrastructure is not an easy task. To run small business, you have to spend a lot of money on infrastructure. Cloud computing provide services on rent just like electricity. You use electricity rather than building it.
Traditional applications require capacity planning before using the application. We buy more servers so that at peak time they can meet our demands but @ IJTSRD | Available Online @ www.ijtsrd.com | Volume -2 | Issue -4 | May-Jun 2018 Cloud computing is a computing model which provides the computing services over the internet on go basis. You can take the services on -infrastructure which results in cost saving. In this paper, we have ussed the differences between traditional IT infrastructure and cloud computing. We have also discussed the benefits of cloud, risks associated with cloud computing and the cloud models.
Cloud computing, Iaas, Saas, Paas, Cloud computing is the delivery of computing services like servers, storage, applications, networks and so on anywhere, anytime over the internet. The services are provided by -you-go basis. You have to pay only for the amount of services Traditional software applications ng and deploying of complex IT infrastructure. A team of professionals is required to manage this infrastructure. Hardware are prone to be updated very soon. Managing software installations and up gradations is a challenging task.
is not an easy task. To run small business, you have to spend a lot of money on infrastructure. Cloud computing provide services on rent just like electricity. You use electricity rather Traditional applications require capacity planning before using the application. We buy more servers so that at peak time they can meet our demands but at other times our servers will be idle. Suppose if we talk about online shopping site, we know that during festival days there will be more users of the site. So our site should be able to handle that load also. In cloud computing, our application may scale up or down elastically. There is no need to do capacity planning in advance. We can rent more servers based upon usage.

II. BENEFITS OF CLOUD
There are three main benefits of cloud: Cost: -cloud provides services at low cost than building your own IT infrastructure. In cloud, you have to pay only for the amount of services you use.
Self-service:-With cloud, you can get the services with just few clicks. You don't have to be depend upon others for services.
Elasticity: -With the help of cloud, services can be scaled up or down on demand.

III. RISKS IN CLOUD COMPUTING
There are various risks associated with cloud computing:-Security: -In cloud computing, our data and applications are managed by third party but it is the higher risk to give control of your data to third party.
Data Location: -In cloud, we don't know the location of data. We don't know at which location our data is placed on the server.
There are security benefits of cloud also. In cloud, multiple copies of data is placed at many places. In the case of failure, data can be easily recovered.

RISKS IN CLOUD COMPUTING
There are various risks associated with cloud computing, our data and applications are managed by third party but it is the higher risk to give control of your data to third In cloud, we don't know the location of data. We don't know at which location server.
There are security benefits of cloud also. In cloud, multiple copies of data is placed at many places. In the case of failure, data can be easily recovered. IV. CLOUD MODELS There are two types of cloud models i.e.service models and deployment models.
Cloud service models are divided into three categories Iaas, Paas and Saas.
Iaas: -In infrastructure as a service, we can take infrastructure like servers, storage, databases on rent from cloud service providers. Virtualization is the process through which we can access remote servers. AWS provide Amazon EC2 to use infrastructure as a service. In Iaas you can use the remote servers without worrying about the hardware maintenance.
Paas: -In platform as a service, we can take the platform on rent from service providers. Suppose if a student writes a first java program and he has not installed JVM on his machine. He can directly copy the java code and run the code online by using online java compiler. Paas is used by developers to develop, test and deploy software applications.
Saas:-In software as a service, we can use the software online without purchasing the license of software and installing it on computer. In saas, software upgrades and security patching is managed by the service providers. In saas, users do not have their own software. They are using the company software. Gmail is the example of saas where Gmail is the software and Google is the service provider. Private cloud: -It is available to an organization. It provides the dedicated storage to an organization. If an organization doesn't want to put its crucial data on public cloud, it can hire private cloud. Private clouds can be deployed at company's own data centres or on the third party.
Hybrid cloud: -It is the combination of both public and private cloud. Suppose ABC institute puts its crucial lecture videos in a private cloud but it replies to its students via email using public cloud, is an example of hybrid cloud.
Community cloud: -Community cloud is used by number of organizations. Multiple organizations purchase the sharable storage from service providers is an example of community cloud.

VI. CONCLUSION
In this paper, we have discussed the concept of cloud computing which has gained lot of popularity now a days. Organizations are moving their data to cloud due to its various benefits over traditional IT infrastructure. But there is security issues related to cloud also. So there is a need to focus on the security problems to maintain the trust level of the organization