Introduction to Cloud Computing : Private, Public and Hybrid Cloud Models

Today I am going to talk about the most demanding cloud technology where so many companies are moving towards the next generation cloud computing approach. Even as per the demand, vendors and service providers are taking the new route to provide the cloud based technology to their customers.

There are so many questions as many of you are not aware of what cloud actually is and how they migrate the traditional network to cloud based infrastructure. But make sure if you are moving to the cloud based technology the hardware should be cloud ready to support and even support the third party APIs.

What is Cloud Computing and how are they helpful to the customers ?

Cloud computing approach storing and gaining access to information and applications over the internet rather than your computer's tough power. It is going again to the times of flowcharts and displays that would constitute the huge server-farm infrastructure of the internet as nothing but a puffy, white cumulonimbus cloud, accepting connections and dishing out facts because it floats.

Cloud computing is the result of the evolution and adoption of existing technology and paradigms. The aim of cloud computing is to permit customers to take benefit from all of those technologies, with out the want for deep knowledge about or know-how with each one among them. The cloud aims to reduce expenses, and enables the users consciousness on their center business rather than being impeded by using IT barriers.

Fig 1.1- Private Cloud Microsoft 

Cloud computing also leverages standards from utility computing to provide metrics for the services used. Such metrics are at the center of the general public cloud pay-in line with-use models. further, measured services are an critical a part of the remarks loop in autonomic computing, allowing services to scale on-call for and to perform computerised failure recovery.

What kinds of cloud infrastructure are provided by the vendors ?

There's an entirely specific "cloud" when it comes to enterprise. some businesses select to enforce software program-as-a-provider (SaaS), where the business subscribes to an application it accesses over the internet. there's additionally Platform-as-a-service (PaaS), where a enterprise can create its very own custom packages to be used by using all in the corporation and recall the powerful Infrastructure-as-a-service (IaaS), wherein players like Amazon, Microsoft, Google, and Rack-space offer a spine that can be "rented out" by way of other groups.

Private Cloud:-

The private cloud model is closer to the more traditional model of individual local access networks (LANs) used in the past by enterprise but with the added advantages of virtualisation. 

The features and benefits of private clouds therefore are:

• Higher security and privacy; public clouds services can implement a certain level of security but private clouds - using techniques such as distinct pools of resources with access restricted to connections made from behind one organizations firewall, dedicated leased lines and/or on-site internal hosting - can ensure that operations are kept out of the reach of prying eyes
• More control; as a private cloud is only accessible by a single organisation, that organisation will have the ability to configure and manage it inline with their needs to achieve a tailored network solution. However, this level of control removes some the economies of scale generated in public clouds by having centralised management of the hardware
• Cost and energy efficiency; implementing a private cloud model can improve the allocation of resources within an organisation by ensuring that the availability of resources to individual departments/business functions can directly and flexibly respond to their demand. Therefore, although they are not as cost effective as a public cloud services due to smaller economies of scale and increased management costs, they do make more efficient use of the computing resource than traditional LANs as they minimise the investment into unused capacity. Not only does this provide a cost saving but it can reduce an organizations carbon footprint too
• Improved reliability; even where resources (servers, networks etc.) are hosted internally, the creation of visualised operating environments means that the network is more resilient to individual failures across the physical infrastructure. Virtual partitions can, for example, pull their resource from the remaining unaffected servers. In addition, where the cloud is hosted with a third party, the organisation can still benefit from the physical security afforded to infrastructure hosted within data centres
• Cloud bursting; some providers may offer the opportunity to employ cloud bursting, within a private cloud offering, in the event of spikes in demand. This service allows the provider to switch certain non-sensitive functions to a public cloud to free up more space in the private cloud for the sensitive functions that require it. Private clouds can even be integrated with public cloud services to form hybrid clouds where non-sensitive functions are always allocated to the public cloud to maximise the efficiency on offer.

Public Cloud:-

The public model offers the following features and benefits:

• Ultimate scalability; cloud resources are available on demand from the public clouds’ vast pools of resource so that the applications that run on them can respond seamlessly to fluctuations in activity
• Cost effective; public clouds bring together greater levels of resource and so can benefit from the largest economies of scale. The centralised operation and management of the underlying resources is shared across all of the subsequent cloud services whilst components, such as servers, require less bespoke configuration. Some mass market propositions can even be free to the client, relying on advertising for their revenue.
• Utility style costing; public cloud services often employ a pay-as-you-go charging model whereby the consumer will be able to access the resource they need, when they need it, and then only pay for what they use; therefore avoiding wasted capacity
• Reliability; the sheer number of servers and networks involved in creating a public cloud and the redundancy configurations mean that should one physical component fail, the cloud service would still run unaffected on the remaining components. In some cases, where clouds draw resource from multiple data centres, an entire data center could go offline and individual cloud services would suffer no ill effect. There is, in other words, no single point of failure which would make a public cloud service vulnerable
• Flexibility; there are a myriad of IaaS, PaaS and SaaS services available on the market which follow the public cloud model and that are ready to be accessed as a service from any internet enabled device. These services can fulfill most computing requirements and can deliver their benefits to private and enterprise clients alike. Businesses can even integrate their public cloud services with private clouds, where they need to perform sensitive business functions, to create hybrid clouds
• Location independence; the availability of public cloud services through an internet connection ensures that the services are available wherever the client is located. This provides invaluable opportunities to enterprise such as remote access to IT infrastructure (in case of emergencies etc) or online document collaboration from multiple locations.

Fig 1.2- AWS Cloud Services

Hybrid Cloud:-

A hybrid cloud configuration, such as hybrid hosting, can offer its users the following features:

Fig 1.3- Hybrid Cloud Infrastructure

• Scalability; whilst private clouds do offer a certain level of scalability depending on their configurations (whether they are hosted internally or externally for example), public cloud services will offer scalability with fewer boundaries because resource is pulled from the larger cloud infrastructure. By moving as many non-sensitive functions as possible to the public cloud it allows an organization to benefit from public cloud scalability whilst reducing the demands on a private cloud.
• Cost efficiencies; again public clouds are likely to offer more significant economies of scale (such as centralised management), and so greater cost efficiencies, than private clouds. Hybrid clouds therefore allow organisations to access these savings for as many business functions as possible whilst still keeping sensitive operations secure.
• Security; the private cloud element of the hybrid cloud model not only provides the security where it is needed for sensitive operations but can also satisfy regulatory requirements for data handling and storage where it is applicable
• Flexibility; the availability of both secure resource and scalable cost effective public resource can provide organizations with more opportunities to explore different operational avenues.

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