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PROPRIETARY SOFTWARE CLOUD SOLUTIONS
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Several vendors offer commercial packages to enable private clouds. Best-of-breed startups, such as Appistry, focus specifically on this problem. Like the open-source solutions described previously, they re designed to enable the creation of a private cloud on multiple commodity hardware resources. Some providers, such as ParaScale, focus specifically on the aspects of cloud computing related to storage. Large IT vendors, such as EMC, Oracle, IBM, and Unisys, are positioning themselves as being able to provide an entire private cloud stack, including hardware systems, virtualization technology, and software applications for operating and managing the private cloud. These systems can be as small as a handful of rack-mounted appliances or as large as data centers filled with thousands of servers housed in modular container pods. Additionally, these providers offer provide consulting services for the architecture, design, and implementation of clouds.
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PRIVATIZATION OF PUBLIC CLOUDS
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Public cloud service providers also provide services that are moving closer to the concept of private clouds. The Amazon Virtual Private Cloud (VPC) offering allows you to connect resources in the public cloud from within its firewall via an IPSec VPN. This isn t the same as a private cloud merely the ability to connect and communicate securely with public cloud resources. You ll read much more about the VPC concept in section 4.3. The next logical step for hosting and public cloud providers is to deliver dedicated private cloud services. In this model, a service provider reserves or dedicates a specific portion of the cloud infrastructure to a specific customer. Some example providers of dedicated private cloud hosting include Savvis, which provides cloud services as a horizontal solution; and SunGard, which provides dedicated cloud services for
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Security and the private cloud
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financial services customers. Dedicated cloud services are much more costly than public cloud services; the difference in cost is similar to the difference in cost between shared commodity hosting, which can be had for under $100/year, and traditional dedicated hosting, which can cost as much as $1,000/month per server. Up to this point in the chapter, you ve read about the merits and drawbacks of pursuing a private cloud strategy and have looked at some of the options for creating a private cloud. Now, let s switch gears and look practically at how to build a private cloud system using open source. It turns out that putting together a private cloud, at least a small-scale proof-of-concept system, is straightforward. Building such a system can help you understand the software components that make up a cloud. Because the open-source private cloud systems have been designed for interoperability with Amazon EC2, they can also provide a playpen environment for experimenting with a hybrid cloud (part private, part public).
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IMPLEMENTING AN OPEN-SOURCE PRIVATE CLOUD
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It s becoming increasingly easy to put together a private cloud using open source as major Linux distributions start bundling cloud software in their standard packages. Ubuntu 9.10 Server, for example, has an option to deploy a configuration called Ubuntu Enterprise Cloud (UEC). On a clean install of the OS, UEC is provided as an option. When you choose this option, Eucalyptus cloud software is installed on the system. The Eucalyptus system consists of several software components that run the private cloud. The first component is called the Node Controller (NC); it resides on each computer that consists of the pool of available resources for creating virtual instances. The NC is responsible for managing the virtual instances started and stopped on an individual computer. One or more computers with NCs on them constitute a cluster, which is managed by another process called the Cluster Controller (CC). The CC is responsible for managing the NCs in its cluster and farms out work orders it receives to the NCs to start and stop virtual instances. A single Cloud Controller (CLC) manages one or more CCs. The CLC is the central management point for the entire system. It s the system of record that contains data tables that describe the overall system and keeps track of the users of the system. The administrator of the system can connect to the CLC to add users and set overall system parameters, such as the sizes and allocations of instances within the system. The CLC also handles authenticating users and processing their requests to do things, such as start and stop instances. The Eucalyptus components talk to each other, but only the CLC need be exposed to a public address space to enhance the security of the system. The network communication between the CLC and the CC and between the NC can all be isolated in private network space. The smallest possible cloud system would consist of two computers: one that served as the CLC and the CC, and another with a NC managing all the available virtual instances. The default virtualization technology used by Eucalyptus is Xen, although you can use other virtualization technologies, such as VMware and VirtualBox. Xen as the virtualization technology has the advantage of being interoperable and migratable
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