Deployment Models Of A Private Cloud, Public Cloud And Hybrid Cloud?

Cloud computing offers services to users based on on-demand self-service, broad network access, measured service, resource pooling and rapid elasticity; These characteristics promise a faster time for implementation, lower cost, superior scalability and a better end user satisfaction. These services are delivered in models known as Software As A service (SaaS), Platform As A Service (PAAS), and Infrastructure As A Service (IAAS). The first layer which is the Software As A service (SaaS) is the layer in which software applications are delivered to end users. Below is the Platform As A Service (PAAS) layer which offers a platform on which applications can be developed. The lowest layer is the Infrastructure As A Service (IAAS) layer, in this layer the physical servers and network infrastructure is offered as a service. These services can be deployed throughout the internet (Public Cloud Computing), on the intranet infrastructure, (Private Cloud Computing), in a shared community of private networks (Community Cloud Computing), or a hybrid of both (Hybrid Cloud Computing). The service deployment models are [8]:

Public Cloud is when services are rendered over a network that is open for public use. May be free. Little to no difference between public and private architecture, however security consideration may be substantially different for service.

The cloud can be rented for use to anyone willing to pay for it. It is the cheapest type of cloud computing service but because of its public nature it is deemed to be less secure. Hybrid Cloud: It consists of multiple private and public clouds.

Cloud Computing has been a buzz world in the past few years. The use of this technology increased considerably when we made huge progress in this domain, reducing the cost for everyone. Today, Cloud Computing is widely used all across the world by a lot of companies such as Microsoft, Facebook, Amazon, etc…

A private cloud is created for the use of a single unit or organization that is dedicated to service the needs of the same unit or organization. Although, the cloud should still remain outside the institution and in the data center space, so that can be referred to as the cloud concept. Managing a private cloud can be done internally (by the unit that uses the cloud) or by a person or a third party, which will manage the cloud for the unit.

Cloud computing includes three service models, it is important to differentiate between them because the service provided is not the same and they do not address the same users. The three service models are:

There are 3 different types of cloud computing: private, public and hybrid cloud. The private cloud is only used by one company, this is either used internally or it is outsourced to another company. The public cloud is when the cloud and all of its services are accessible by anyone. A Hybrid cloud is a combination of the two.

The public cloud is a deployment model where cloud services are provided over a public network, such as the internet, by a third-party provider. Examples of public cloud services include Dropbox, Gmail and Twitter. By definition, most SaaS applications operate under the public cloud deployment model. One of the primary advantages of public cloud is its attractive pricing model. The organisation is typically charged a subscription fee for access to the cloud services, paying only for the number of users required, this removes the need for business to manage software licences (Savvas [Online], 2014). However, security conscious organisations requiring a SaaS solution may opt for a private cloud segregated from public networks. There are obvious security concerns involved in exposing a SaaS application to a public network. However, there are concrete steps an organisation can take to reduce the risk incurred with public cloud deployments. Many public cloud SaaS providers offer two-factor authentication, requiring an additional level of verification before the user’s credentials are accepted. This is typically achieved using an authentication code in the form of a text message sent to the user’s registered mobile number. Furthermore, organisations should develop and maintain a culture of cyber security, enforce best practices such as creating strong passwords and training staff in phishing awareness.

Cloud computing can assist organisations improve the creation and delivery of IT solutions by allowing them to access services more flexibly and cost effectively. In public cloud computing, services are delivered by a third party to its external customers. In private cloud computing, IT provides services to internal customers.

Different deployment models are designed to support a variation of consumers’ privacy requirements for cloud adoption. NIST defines cloud deployment models as public, private, community, and hybrid [6]. A cloud system can be operated in one of the following four deployment models:

Mostly the user of this kind of model runs cloud servers within its own data center. 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.

Public cloud: cloud computing model whereby a cloud service provider provision resources over the internet such as software and data storage, which clients can access through the web browser.

Public cloud/outer cloud: This model permits cloud environment as straightforwardly or publically available. Open cloud is off reason in which different endeavors can be utilized to convey the administrations to clients by taking it from outsider. Private cloud/inside cloud: This model alluded to on-reason cloud, which is overseen or claimed by an association to give the abnormal state control over cloud administrations and base. At the end of the day private cloud is assemble particularly to give the administrations inside of an association for keeping up the security and protection. Hybrid cloud/virtual private cloud demonstrate: This model traded off both private and open cloud models where distributed computing environment is facilitated and oversaw by third get-together (off-reason) however some committed assets are secretly utilized just by an association. Community model: It permits the distributed computing environment, which is shared or oversaw by number of related associations.

In many ways, private clouds are way different than public clouds in terms of operations. Private clouds as the name suggests are basically for an organization and operated by organization itself. This current model is similar to public clouds in terms of effective collaboration and communication of users and operators to benefit the private organization. This helps in steps closer to goals involved in system operators and

Once connected, a cloud could be either set in private or public mode, depending on a companies or individuals priority for the safety of the data. Even though it seems that there is a general theme,