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These materials are the copyright of John Wiley & Sons, Inc. and any dissemination, distribution, or unauthorized use is strictly prohibited. 10 Platform as a Service For Dummies, Special Edition ✓ Application development and execution services ✓ Integrated lifecycle services ✓ Workload management services ✓ Data management services Deployment Models for Cloud Computing Whether you’re interested in IaaS, SaaS, or PaaS, you need to understand how you may use one of these services to meet your company’s business requirements. The three different kinds of deployment models are public, private, or hybrid (a combination of the two). What separates the three cloud models is who actually owns, hosts, and operates the cloud resources. Location is also another big factor. What kind of deployment makes the most sense for you depends on factors ranging from industry regulations to your current investments in legacy systems. In this section, we detail each of these cloud models so you can get a better handle on your choices. The public cloud When people started talking about the notion of the Cloud a number of years ago, most were referring to what’s now called a public cloud. The public cloud is actually a set of servers, networks, storage, services, and interfaces owned and operated by a third party for use by other companies that are accessible from anywhere via the public Internet. Also, because of economies of scale, cloud-managed service providers can staff deep IT skills in specialty areas such as security so you don’t have to. For example, a company may decide to use a public cloud service for a workload, such as electronic mail (e-mail). E-mail is a good candidate for a public service because it’s a relatively generic application with a well-understood workload pattern. Companies that specialize in public cloud e-mail services can optimize their hardware and software environment to support this type of workload and provide different levels of security — for a price. In reality, these companies can provide e-mail services for a fraction of the price that it costs to run and support an internal mail service.
These materials are the copyright of John Wiley & Sons, Inc. and any dissemination, distribution, or unauthorized use is strictly prohibited. Chapter 1: Setting the Fundamentals of the Cloud 11 What enables the cloud provider economies of scale is a concept known as multi-tenancy, which means that different companies share all or some of the same underlying resources. One of the benefits of this platform is that on-boarding a new customer can be done in a cost-effective manner because the cloud doesn’t provide a fixed set of resources just for that customer. Of course e-mail isn’t the only service to be put into the cloud. Other examples include video services, human resources, and backup services — to name a few. Also, development, testing or deployment organizations may have periods of high demand followed by less active periods. In addition, these teams are often located across geographies. Having an optimized platform that can be scaled up or down based on demand is a logical economic model for many organizations. Running application development and testing in the cloud can be less expensive than buying and configuring servers. As long as the provider is trustworthy, companies are seeing the benefit of using this type of public cloud service. In the public cloud model, the end-user really doesn’t have to know anything about the underlying technology. The cloud provider is in charge of all the development and maintenance of the environment. If a problem exists, the cloud provider is responsible for fixing the problem. What’s a private cloud In some situations, a public platform (see the preceding section) may not be the most appropriate environment for an organization. The company may be part of a highly-regulated industry and needs to prove that its IT can comply with regulations. While companies like the freedom of the public cloud, they may need more direct control for a particular portion of their IT environments. The company may need a specialized custom security service and already have hardware and a hosting facility they want to amortize ownership of their infrastructure and solution, or, more simply utilize data and applications within an existing datacenter. Those companies could adopt what’s called a private cloud. What makes a private cloud different than a data center that includes some server virtualization Take a look at several key differences:
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