Information Technology Reference
In-Depth Information
Hybrid Cloud
Hybrid clouds are provisioned by combining one or more cloud models, providing access to
multiple infrastructures bridged together by standard or proprietary technologies.
With hybrid clouds, organizations can utilize cost benefits of a public cloud to run services
as usual and switch to a private cloud for confidential and sensitive data. For example, an
organization may keep sensitive client data in-house on a private cloud setup and interface its
private cloud to a public cloud service that processes customer billing.
The biggest advantage of such a model is maintaining segregation between types of
applications and data in the public domain and those that stay in private control. The other
advantage is to be able to provision or migrate applications or data between platforms as
and when required.
The biggest challenge of this approach is to contrive compatibility between two different
platforms for applications to run seamlessly and for data to be imported or exported with-
out issues.
Cloud Bursting
Cloud bursting is an application deployment model in a hybrid cloud setup. Local private
cloud resources are used for running an application for normal operational load until there
is a spike in demand that exceeds local resource limits. When a spike occurs, the application
moves, or “bursts,” out of the private cloud into the public cloud to manage the overrun.
Cloud bursting is recommended for high performance, non-critical applications that
handle nonsensitive information. Another use case for cloud bursting is to move out appli-
cations to the public cloud to free up local resources to run business applications.
One of the major limitations of cloud bursting is that the designated public cloud plat-
form should be fully compatible with the private cloud to successfully run the bursting
applications. This model works best for applications that do not have a complex delivery
mechanism, do not use vendor-specific APIs, and do not require complex integration with
other applications and system components.
Another issue with provisioning cloud bursting is the limited availability of manage-
ment tools that are cross-compatible over multiple platforms. Cloud service providers and
hypervisor vendors offer tools to send workloads to the public cloud automatically, but
they usually come with multiple strings attached, such as vendor lock-in, limited compat-
ibility, and expensive monitoring tools. Figure 10.1 shows popular cloud computing types.
Cloud Management Strategies
With the growing complexity and variety of private, public, and hybrid cloud-based systems,
cloud management strategies help to monitor numerous tasks, including performance, secu-
rity auditing, disaster recovery, and contingency plans.
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