1.9.2 Deployment Models:. Different Deployment Models Are

Cloud provider is organizations that provide cloud-based IT resources. Thus, we can think the cloud provider is the organizations of business and company that take responsibility to create cloud services available to demand of cloud computing technology in the market. In addition, they are providing cloud-computing services are the minimum level of services that a provider will provide to client per the agreement, as known SLA. Therefore, cloud computing services require management and administrative duties to look after the overall of cloud computing infrastructure service to make sure the cloud computing services is going smoothly. Apparently, cloud computing provider owns the cloud base or IT resources of cloud computing. Then, the company is divided potential of cloud base in order to provide the lease for commercial. Nevertheless, there are some companies of cloud providers also “resell” IT resources, which rent from other cloud providers (Rouse, 2011, n.p.g.; Horvath, 2015, n.p.g.)

Especially in the public cloud and other deployment models user can choose the different models but the privacy and accountability in the public cloud are not related to cloud service provider and it is causing problems to the organizations.

As we learned in previous weeks, cloud computing services have three major different cloud architectures for different demanding customers. The three different architectures are Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS). For the words of the name, we can see the obvious differences among these three architectures, which they provide different cloud services based on their specific cloud architectures. What are the differences among these three cloud services? What are the responsibilities for the cloud services providers? What are the responsibilities for the customers? The following will discuss about these questions.

With the unprecedented growth and spread of information, there is no wonder why large Information Technology companies have been investing in the “cloud”. To expand, when referring to Cloud Computing, this means to access and store information not stored with in your computer whether it be public, private, or hybrid cloud computing. In technological terms, the server you are accessing is somewhere else and therefore, the information and tools you are using are “up in the clouds” but more so stored in another server space. However, whether you are paying for

Public cloud is the infrastructure for open use. It is hosted on the premises of the cloud provider. Public cloud is flexible, scalable and cost-effective. The data and processing environment are not under control of enterprises. The model is not suitable for applications or data with a security requirement.

Cloud solution provides shared resources on demand, which is highly configured and computed, with minimized management efforts required. With the emergent of cloud services, individual users and enterprises with various capabilities would able to manage their data either locally or remotely, with servers located somewhere else, or they pay to have cloud providers manage the data.

Furthermore, different deployment models exist, we are going to focus only on the two different poles, the private cloud and the public cloud. The former means that the cloud infrastructure is owned and operated by a single and usually the same organization, while the latter stands for a public infrastructure where basically everyone can use it under different conditions. And this is the “cloud” we will be referring to in this essay.

Public clouds are multi-tenant architecture and has pay as you go system. Some of the top vendors are Microsoft Azure, AWS etc. In this kind of model, a third party provider makes resources to public through the internet. The users do not have to set up or maintain their own cloud servers in the house. The hybrid model has the capacity of cloud bursting and has benefits of both the private and public models. This model has both the private cloud and third party public cloud services. Rouse, M. (2017, July). Though there are these kinds of model, the users tend to choose multi-cloud model. This is utilization of two or more clouds. The benefit of this kind of was of operating is that they can easily migrate between the clouds and minimize the risk of service outage. According to a survey around 61 % of users use multi cloud models.

The issue of cloud computing refers to either the applications that are delivered in the form of services on the internet or the systems software and hardware in the data centres that are meant for the provision of those services (Dinh, et al. 2013). As outlined by NIST, there are usually four main cloud delivery models. The cloud models are

The cloud service and infrastructure is provisioned for public. It may be owned, managed, and operated by a business, academic, or government organization, or some combination of them. Public Cloud is more like a true host that provides services and infrastructures to various customers. Customers have no controls or privilege over the locations of the infrastructures. The vulnerable part of this model is privacy and security since data and processing environment are not under management and control of the providers. Also some issues may occur such as network overwhelming, power outages, and hacker attacks, so running service in Public Cloud model is not 100% secured and perfect. That is why we will discuss next one. Examples of Public Cloud: Microsoft Windows Azure, IBM Smart Cloud.

Cloud computing is a web based utility model. The user does not need to maintain any infrastructure that is to be managed by the provider that is cloud provider. The cloud provides different solutions for the software, platform oriented and the infrastructure. There are three types of services offered which are classified as (IaaS) Infrastructure as a Service, Platform as a service (PaaS) and Software as a Service (SaaS). These services can be deployed by its cloud models that can be private, public, hybrid and community model.

According to Prasad, Gyani and Murti (2012), “Cloud computing can be defined as a new style of computing in which dynamically scalable and often virtualized resources are provided as a service over the Internet” (p.7). This statement is from five years ago, and although cloud computing is no longer considered new, this definition still describes what cloud computing means today. Cloud computing being private or public is becoming more primordial in the IT sector due to the numerous advantages it gives to its end users (Basmadjian et al. 2012). Since the interest in cloud computing keeps on increasing, efforts need to continue to evaluate current trends in security and privacy. Cloud computing

A public cloud is a freely available cloud environment possessed by a third-party cloud provider. The IT resources on public clouds are generally offered to cloud buyers at an expense or by means of different avenues, (for example, a promotion). The cloud supplier is in charge of the creation and continuous support of people in public cloud and the IT assets.

Cloud computing involves a lot of concepts and technologies. Companies and corporations such as Amazon, Google and Microsoft are providing services following the logic of computational infrastructure cloud computing, with Amazon the pioneer in providing and marketing infrastructure of this kind.

This paper does a survey on the current dynamic load balancing strategies to meet the need of cloud computing environments. This survey starts with an overview of each of these strategies and approaches, then describes the properties and finally compares them based on multiple criteria like : Resource Utilization, Traffic Management, Throughput, Response Before getting into the challenges and different cloud computing techniques, few areas like its architecture and how it differs from traditional data centers, need to be discussed. Now conventionally a cloud system is divided into two components - front-end and backend.[29]. Both of these two components are generally connected with each other via internet. As the name suggests, Front end is what a user sees and on the other hand,