Читать книгу The Official (ISC)2 CCSP CBK Reference - Leslie Fife, Aaron Kraus - Страница 15

There are four deployment models: public, private, community, and hybrid clouds. These define who owns and controls the underlying infrastructure of a cloud service and who can access a specific cloud service.

A public cloud deployment makes resources available for anyone who chooses to create an account and purchase access to the service. A service like Dropbox is available to the public SaaS deployment. Accounts on various cloud service providers such as Amazon Web Services (AWS), Google, and IBM Cloud are also public deployments of services.

A private cloud deployment consists of a set of cloud resources for a single organization (business, non-profit, etc.). The cloud may be located on-premise in the organization’s data center or may be in a single tenant cloud environment provided by a CSP. The services (SaaS, PaaS, or IaaS) are available solely to that organization. You get many of the advantages of a cloud such as the on-demand resources and minimal management effort. However, the company still owns the infrastructure. This can provide the benefits of cloud computing for files and data that are too sensitive to put on a public cloud.

A community cloud is most similar to a public cloud. It is a cloud deployment for a related group of companies or individuals such as a consortium of universities or a group of local or state governments. The cloud may be implemented in one of the organizations, with services provided to all members. Or, it can be implemented in an infrastructure like AWS or Google. However, access to the cloud resources is available only to the members of the group.

A hybrid cloud is any combination of these. A company may have a private cloud that accesses public cloud resources for some of its functions. The hybrid cloud allows the organization of cloud resources in whatever way makes the most sense to the organization. Private individuals are not usually involved in a hybrid cloud. This is because few individuals have their own private cloud or belong to a community cloud as individuals.

These concepts will be discussed further in the “Cloud Deployment Models” section later in this chapter.