Cloud Delivery and Hosting Models - Deploying and Managing a Cloud Infrastructure - page 160

Public

The public cloud deployment model is the most widely used and popular deployment model
for cloud solutions. It is considered the true form of cloud computing or hosting. Public cloud
environments are entirely owned, deployed, monitored, and managed by the cloud service
provider. Public cloud customers can generally be any organization or entity that has some
computing requirements. The customers can create and access cloud resources such as stor-
age, computing, and software on a metered, pay-as-you-go billing scheme, and they can
source virtual servers (from a single virtual server to thousands), cloud storage components,
applications, and other resources instantly through a process called provisioning . The sell-
ing point for public cloud offerings is that customers do not need to spend much on up front
capital costs, nor do they have to relinquish ongoing operational costs in order to create,
access, and manage such resources. The cloud computing facility is shared by multiple users
simultaneously. They each have their own share of computing resources, and their data and
processes may intermingle in what appears to be separate machines with other customers'
data and processes without them knowing it. This is called virtualization , which means that
multiple customers are sharing or utilizing the same set of resources.
The following types of organizations are suited for the public cloud deployment model:

General businesses (small and medium enterprises, or SMEs) using a public cloud to
host their applications, back up data and files, and more

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Software developers and publishers that deliver their software on a Software as a
Service (SaaS) platform

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IT service providers, managed service providers (MSPs), and value-added resellers
(VARs) that use a public cloud to deliver IT solutions and services

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Hybrid

The hybrid cloud deployment model enables organizations to keep their data secure and
under their control in an on-premises or private cloud environment while also provisioning
applications and shared storage from the public cloud. It is a combination of two or more
cloud deployment models—specifically, using a private and public cloud. The hybrid cloud
model is ideal for organizations that have some reservations about using the cloud but are
still interested in gaining its benefits.
The following types of organizations are suited for a hybrid cloud deployment:

SMEs having multiple IT resource requirements and using a public cloud to balance
traffic/computational load from private to public cloud

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IT service providers using a combination of private and public cloud models to service
their clients

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Application/software developers using a public cloud for testing, integration, and
deployment

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