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Practical considerations
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This chapter covers Choosing a cloud provider Public cloud providers and SLAs Measuring cloud operations
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It s been one week since you launched the new corporate collaborative portal on the cloud to great fanfare. You re still basking in the accolades of your colleagues as you log in to the application to see the CTO s latest blog posting on the wonders of cloud computing, only to find out that your new site is unreachable. It must be a glitch, you think, trying again. Same result. Frantically, you try other sites within the intranet. You can reach the cafeteria menu application without any problem. Next, you try reaching other sites on the internet, such as yahoo.com again, success. You try your portal once more. Still unavailable. You re starting to get that sinking feeling, as you imagine going from hero to goat in the short span of a week. But it s your lucky day. The gods of IT look down mercifully on you, and lo and behold, 10 minutes later the portal is back online. What happened, and how did the situation resolve itself Applications running in your corporate data center are typically monitored and managed using network management-systems software. How can you gain similar insight into the operation of an application running in the cloud
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Practical considerations
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Running applications in the cloud is different from running an application in your data center in the level of control you have over the resources that make up the application. You need a good level of visibility to understand how a cloud application is operating and to fix and find problems when they occur. The last three chapters looked at topics related to applications in the cloud. Specifically, in chapters 5 and 6, you read about the design and architecture related to scalability and reliability of cloud applications. You continued through to the development and testing of cloud applications in chapter 7. Now, armed with an understanding of how to design, build, test, and deploy applications for the cloud, let s shift our focus to the practicalities of putting cloud applications into production. In this chapter, we ll look at the business considerations important in choosing a cloud provider by examining the key criteria for evaluating various vendor offerings. We ll also look more closely at the technical operational issues most important for cloud applications. Finally, you ll be able to measure how a cloud application is doing and how well the cloud vendor is living up to their end of the bargain.
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Choosing a cloud vendor
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Choosing a cloud vendor is a momentous decision. Let s explore the two most critical aspects of making that decision: the business considerations and the technical operational considerations.
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Business considerations
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When choosing a public cloud provider, you re often able to purchase services in an on-demand fashion. The advantage of this sort of arrangement is the ability to stop using it at any time. You can experiment with the services at little cost, and if the quality and reliability of the service leaves something to be desired, you can choose to go elsewhere. If you re running an application requiring significant investment that has high business criticality, or if you re considering an annual contract to lower costs, it probably makes sense to proceed cautiously. In this case, the selection and evaluation of a potential cloud provider bears some similarity to how you choose a traditionally outsourced service, such as web hosting or collocation. The questions you should research and ask regarding the basic facts about a business providing cloud services should be along the lines of the questions you ask any outside vendor:
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Financial viability: How long has the vendor been around Are they financially stable Is it a public company or a well-financed privately held company Is it profitable Operational viability Does it have the requisite core assets, such as multiple data centers, and is it reasonably located
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