Understanding cloud computing classifications in .NET

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Understanding cloud computing classifications
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To understand a cloud API for which there isn t yet an accepted standard it s best to look at Amazon s cloud API as the default standard as they re the leaders. Table 2.2 outlines some of the basic definitions and operations central to the Amazon cloud API.
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Table 2.2 Basic terms and operations of the Amazon EC2 API Description An Amazon Machine Image is an encrypted and signed machine image suitable to run in a virtual server environment. For example, it may contain Linux, Apache, MySQL, or PHP as well as the application of the AMI s owner. , AMIs can be public (provided by Amazon), private (custom designed by its creator), paid (purchased from a third party), or shared (created by the community for free). AMIs can be stored in Amazon s Simple Storage Service (S3). Instance The result of launching an AMI is a running system called an instance. When an instance terminates, the data on that instance vanishes. For all intents and purposes, an Instance is identical to a traditional host computer. 1. 2. 3. 4. Connecting Use a standard AMI by customizing an existing one. Bundle the AMI, and get an AMI ID to enable launching as many instances of the AMI as needed. Launch one or more instances of this AMI. Administer and use the running instance(s).
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Term AMI
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Standard flow
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From a web browser, go to http://<hostname>, where <hostname> is your instance s public hostname. If you want to connect to a just-launched public AMI that hasn t been modified, run the ec2-get-console-output command. The result in either case enables you to log in as root and exercise full control over this instance, just like any host computer you could walk up to in a data center.
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We ve barely scratched the surface of all the concepts and corresponding API calls that exist in Amazon s API. Documentation is available at http://docs.amazonwebservices. com. APIs also cover these areas:
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Using instance addressing Using network security Using regions and availability zones Using Amazon Elastic Block Store (EBS) Using auto scaling, elastic load balancing, and Amazon CloudWatch Using public data sets Using Amazon s Virtual Private Cloud
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We ll revisit select aspects of the cloud API at various points throughout the book. Let s leave this now and talk about the next important layer in what it takes to set up and use a cloud: cloud storage.
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The technological underpinnings of cloud computing
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Saving persistent data in cloud storage
You store your luggage in the trunk of your car. Similarly, the cloud provides a place to store your machine images, your applications, and any data your applications need. Cloud storage has also increased in popularity recently for many of the same reasons as cloud computing. Cloud storage delivers virtualized storage on demand over a network based on a request for a given quality of service (QoS). Unlike the long provisioning lead times required in corporate data centers, there is no need to purchase storage or in some cases even provision it before storing data. Typically, you pay for transit of data into the cloud and, subsequently, a recurring fee based on the amount of storage consumption your data uses. You can use cloud storage in many different ways. For example, you can back up local data (such as on a laptop) to cloud storage; a virtual disk can be synched to the cloud and distributed to other computers; and you can use it as an archive to retain (under some policy) data for regulatory or other purposes. You can use cloud storage for applications that provide data directly to their clients via the network. The application redirects the client to a location at the cloud storage provider for the data. Media such as audio and video files are examples. The network requirements for streaming data files can be made to scale in order to meet the demand without affecting the application. The type of interface used for this is HTTP. You can fetch the file from a browser without having to do any special coding, and the correct application is invoked automatically. But how do you get the file there in the first place, and how do you make sure the storage you use is of the right type and QoS Again, many offerings expose an interface for these operations, and it s not surprising that many of these interfaces use REST principles. This is typically a data-object interface with operations for creating, reading, updating, and deleting the individual data objects via HTTP operations. Keeping with Amazon s APIs as good examples to study, we ve outlined a simple API dealing with Amazon s S3 in table 2.3.
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