Rationale for a private cloud in .NET

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Rationale for a private cloud
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Clusters within a Eucalyptus System
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Figure 4.8 Architectural model for a Eucalyptus private cloud implementation. The Node Controllers (NCs) manage virtual instances on each physical server. These are controlled up in the hierarchy by Cluster Controllers (CCs) that manage an availability zone. At the top level, the Cloud Controller (CLC) manages the entire private cloud system and takes commands from both administrator and user client systems.
to the Amazon cloud. Much larger configurations are also possible with multiple CCs managing virtuals on multiple NCs. The clusters in a Eucalyptus system are analogous to the availability zones within Amazon. You can see an architecture diagram depicting the topology in figure 4.8. As mentioned earlier, a plus point of the open-source cloud implementations is the fact that they have been built to interoperate with the Amazon cloud. The CLC exposes SOAP-based client interfaces that conform to the WSDL documentation provided by Amazon. Because Amazon publishes its user-facing APIs, open-source cloud software providers are able to provide client interfaces that are compatible. Administration interfaces used by Amazon to run EC2 aren t publicly available, so Eucalyptus implemented its own interfaces. The administrator, either through a webbased interface or via command line, accesses these Eucalyptus-specific interfaces. For registration, to use the Amazon cloud, automatic approval is granted using credit-card
Security and the private cloud
verification. In the Eucalyptus system, you can request access via a web-based interface that sends an email to the administrator who manually grants access. The administrator can start or terminate your instances and is able to add disk images. The administrator is also in charge of adding clusters and nodes to the cloud configuration. The open-source private cloud implementations provide a simple way to begin experimenting with private cloud technologies. Both Eucalyptus and Open Nebula were developed as academic research projects; both were built to help elucidate the functionality of private clouds. They were also built with extensibility in mind, meaning that the prebuilt functionality was designed to allow additional capabilities to be layered on. Proprietary cloud software offers greater functionality out of the box. You ll find some examples of this in load-balancing and fault-tolerance functionality as well as more extensive management and monitoring capabilities for effectively administering the cloud.
A virtual private cloud
Amazon is the first to have created a virtual private cloud (VPC) that connects your data center to Amazon s EC2. The idea is to use Amazon EC2 instances within VPC to add additional web-facing servers to your application when the traffic exceeds your on-premise capacity. The back-end of your application, database servers, authentication servers, and so forth, remains within the walls of your data center. When demand subsides, you can terminate the Amazon EC2 instances that you no longer require. Amazon has chosen not to call this cloudbursting, but that s precisely what it is.
How it works
A VPC is a secure and seamless bridge between an organization s existing IT infrastructure and a provider s public cloud. You can see this in a high-level simplistic fashion in
A virtual private cloud
Amazon Virtual Private Cloud is a secure and seamless bridge between a company s existing IT infrastructure and the public cloud. Although not a private cloud as you ve read about earlier, this approach offers corporations a hybrid model merging aspects of the company s data center with a major cloud provider s public cloud. Amazon s VPC enables enterprises to connect their existing infrastructure to a set of isolated AWS compute resources via a Virtual Private Network (VPN) connection, and to extend their existing management capabilities, such as security services, firewalls, and intrusion-detection systems to include their AWS resources. Google has a similar structure called Secure Data Connector, which connects legacy infrastructure to Google s AppEngine Platform as a Service (PaaS) public cloud.
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