A virtual private cloud in .NET

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A virtual private cloud
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Organization s isolated resources within provider s cloud
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Figure 4.9 A high-level architectural view of a virtual private network. A secure VPN connection connects an organization s existing infrastructure including all its security components, such as firewalls and intrusion-detection systems to a portion of the public cloud isolated for the organization.
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figure 4.9. The idea is to connect an organization s existing infrastructure to a set of isolated cloud-compute resources via a VPN connection. In this way, an organization can extend its existing management capabilities and security services, such as firewalls and intrusion-detection systems, to include the cloud resources that have been dedicated to the organization, and protect the information there the same as is done now.
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The API
The operation of a VPC when there s an existing mature public cloud is fairly simple. You launch standard instances, such as for Amazon EC2, into a new VPC, and then EC2 API calls are used to dictate the IP address range from which this new instance will receive its IP address. Then, you use your preexisting security infrastructure, such as firewalls, intrusion-detection systems, and management systems, to enforce policies based on these IP address ranges and control who and what has access to resources running inside your VPC. Table 4.3 briefly outlines the steps.
Table 4.3
Security and the private cloud
Basic steps to create a virtual private cloud using EC2 API calls API call Function Creates your VPC, within which you define the IP address space you wish to use. Create one or more subnets where your isolated resources, such as Amazon EC2 instances, are placed. You need at least one subnet, but you can have more. Creates a Customer Gateway, providing information about your devices such as IP address and other networking-related information. CreateCustomerGateway returns a Customer Gateway ID that you can use to represent your device when interacting with the service. Creates a VPN Gateway, which anchors the VPC side of your VPN connection and encrypts/decrypts messages to/from the Customer Gateway via the VPN connection. Creates a VPN connection between your Customer and VPN Gateways.
CreateVpc
CreateCustomerGateway
CreateVpnGateway
CreateVpnConnection
In addition to cloudbursting, Amazon s VPC tries to offer a solution that addresses cloud security, which, as we ve said, remains the single biggest impediment most enterprises cite as their reason not to adopt cloud computing.
Implications
A virtual private cloud has many usage scenarios. Let s briefly discuss three here: expanding corporate applications into the cloud, scaling a website into the cloud, and setting up a disaster-recovery site.
EXPANDING CORPORATE APPLICATIONS INTO THE CLOUD
Moving your corporate applications into the cloud to reduce the total cost of ownership can realistically be achieved using a VPC. Applications such as email systems, financial systems, trouble-ticketing systems, CRM applications, and others are standard fare for all large organizations. These corporate applications can be logically grouped by IP address range according to existing deployment policies; and because the VPC you set up exists behind your corporate firewall, users can access the applications moved into the VPC the same way they do today.
ELASTICALLY SCALING YOUR WEBSITE IN THE CLOUD
Corporate websites can be an embarrassing place for failure due to sudden spikes in traffic. Any new ad or a news story can set this in motion. You can use VPC to add web servers. When the traffic load exceeds your on-premises capacity, you have room to expand dynamically (and quickly). The back-end of your website, database servers, authentication servers, and so on, can remain within the walls of your data center. When demand subsides, you terminate the Amazon EC2 instances you no longer require, and you don t have to pay for the excess capacity you d normally have.
Private clouds in practice
DISASTER RECOVERY
Disaster recovery is vitally important but expensive and can be difficult because you have to use a different data-center location. Using VPC, you can periodically back up mission-critical data from your data center to a small number of virtual instances in conjunction with large cloud storage volumes. In the event of a disaster, you can quickly launch replacement compute capacity to ensure business continuity. When the disaster is over, you send your mission-critical data back to your data center and terminate the cloud instances you no longer require. That s the theory. Now, let s look at several real-world case studies to further illuminate how private clouds can be used effectively.
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