Whitepaper

Public and Private Cloud

What does your business need today?

WOLF Frameworks

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Public and Private Cloud

Contents

Abstract

Types of Cloud

Public Cloud Interfaces

Private Cloud Interfaces

Cloud Data Security

Cloud Selection Criteria

Developing Application using WOLF Platform-as-a-Service

Flexibility of deploying WOLF based Cloud Applications

Conclusion

References

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Public and Private Cloud

Abstract

Public Cloud and Private Cloud are the two most common

terminologies floating around in this new IT buzz called

Cloud Computing. There is no denying that the use of Cloud

is on the rise. Though the cloud boasts a number of

advantages there are certain concerns that are hampering

its adoption. In this whitepaper we have discussed about

the various types of Clouds available to your disposal and

why should you select one. We have also discussed about

the key concerns of cloud adoption and how you can

minimize the risks. Finally we have given a brief insight on

the flexibility of the WOLF cloud deployment methods.

Types of Cloud

There are three types of cloud available: Public Cloud,

Private Cloud and Hybrid Cloud. Public cloud computing,

what we hear the most is where Amazon EC2, Microsoft

Azure, and Google Apps come to mind. But whether it is

the right model depends on the criticality of your

application and infrastructure requirements. It may work

for some of your computing needs, but if you feel more

comfortable to have your computing resources inside your

own firewalls, then private cloud computing is the right

answer. That’s what enterprises tend towards when they

have a large user base and they are concerned about the

data, security and latency.

Figure 1: The Cloud

Let us now look into each of these clouds one by one:

Public Cloud - In a Public cloud, the vendor hosts the

infrastructure in his remote own location and the customer

has no access, visibility or control of it. It is shared by

multiple organizations. Public cloud definitely reduces the

overhead of infrastructure management but at the cost of

control.

Private Cloud - Private cloud is owned by a single

organization and is not shared by anyone else. They are

dedicated resources and may be hosted on-premise or off-

premise in a third party vendor location. Though Private

cloud gives you a control over the resources, it leaves you

with an overhead to manage it.

Hybrid Cloud - A Hybrid Cloud is a combination of Private

and Public cloud. Such as, when an organization uses a

Private Cloud for secure applications and a Public Cloud

during peak load, the usage is called a Hybrid Cloud.

Though a Hybrid Cloud gives you the best of both the

services, yet you have to decide between a Public or

Private cloud for the base of your operations.

Public Cloud Interfaces

Public cloud offers virtualized resources as a service,

enabling the deployment of an entire IT infrastructure

without the associated capital costs, paying only for the

used capacity. Amazon EC2, Microsoft Azure, ElasticHosts,

GoGrid, iWeb and Rackspace are examples of commercial

cloud providers of elastic capacity. They also offer a public

interface for remote management of virtualized server

instances within their proprietary infrastructure.

Private Cloud Interfaces

Private Cloud provides users with a flexible and agile

private infrastructure to run service workloads within their

administrative domains. Platform VM Orchestrator (VMO),

VMware vSphere, Citrix Cloud Center (C3), and Red Hat

Enterprise Virtualization Manager are commercial tools for

management of virtualized services on the datacenter for

building private clouds. OpenNebula Virtual Infrastructure

Engine (now part of Ubuntu) is an open-source alternative

for private cloud computing, which also supports hybrid

cloud deployments to supplement local infrastructure with

computing capacity from an external cloud.

Private cloud interfaces should allow the integration of the

virtualized distributed infrastructure in the data-center

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