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NOTE Ironically, some organizations use cloud computing to deliver their corporate intranet
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Intranets are customarily used within an organization and are not accessible publicly That is, a web server is maintained in-house and company information is maintained on it that others within the organization can access However, now intranets are being maintained on the cloud To access the company s private, in-house information, users are having to log on to the intranet by going to a secure public web site
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In this section we ll talk about the merits of developing your own in-house cloud and what is used in its composition
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There are two main components in client/server computing: servers and thin or light clients The network map in Figure 1-5 shows how they are deployed The servers house the applications your organization needs to run, and the thin clients which do not have hard drives display the results
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Applications like VMware or Microsoft s Hyper-V allow you to virtualize your servers so that multiple virtual servers can run on one physical server These sorts of solutions provide the tools to supply a virtualized set of hardware to the guest operating system They also make it possible to install different operating systems on the same machine For example, you may need Windows Vista to run one application, while another application requires Linux It s easy to set up the server to run both operating systems
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Server
FIGURE 1-5
A client/server computing deployment consists of servers and thin clients
1:
Cloud Computing Basics
Thin clients use an application program to communicate with an application server Most of the processing is done down on the server, and sent back to the client There is some debate about where to draw the line when talking about thin clients Some thin clients require an application program or a web browser to communicate with the server However, others require no add-on applications at all This is sort of a discussion of semantics, because the real issue is whether the work is being done on the server and transmitted back to the thin client
PART I PART I PART I
First Movers in the Cloud
There are scores of vendors who offer cloud services What they have to offer varies based on the vendor and their pricing models are different, as well Let s take a look at some of the big names in the world of cloud computing and talk, briefly, about what they have to offer
NOTE We ll talk about them in greater detail in 11
Cloud computing is a growing field, and there will likely be new players in the market in the foreseeable future For now, let s look at the names you already know: Amazon, Google, and Microsoft
Amazon
Amazon was one of the first companies to offer cloud services to the public, and they are very sophisticated Amazon offers a number of cloud services, including Elastic Compute Cloud (EC2) your organization Offers virtual machines and extra CPU cycles for
Simple Storage Service (S3) Allows you to store items up to 5GB in size in Amazon s virtual storage service Simple Queue Service (SQS) Allows your machines to talk to each other using this message-passing API SimpleDB A web service for running queries on structured data in real time This service works in close conjunction with Amazon Simple Storage Service (Amazon S3) and Amazon Elastic Compute Cloud (Amazon EC2), collectively providing the ability to store, process, and query data sets in the cloud These services can be difficult to use, because they have to be done through the command line That said, if you are used to working in a command-line environment, you shouldn t have much trouble using the services Amazon s virtual machines are versions of Linux distributions, so those who are experienced with Linux will be right at home In fact, applications can be written on your own machine and then uploaded to the cloud Amazon is the most extensive cloud service to date You can see more about Amazon s cloud services at http:/ /awsamazoncom
Part I:
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