Chapter 1: Surveying the State of IT for the Enterprise 9
“ as‐a‐service” marketplace is likely to triple in size through 2019( source: https:// 451research. com / report‐short? entityId = 87624 & referrer = marketing).
Figure 1-1: Comparing public cloud service types.
Large IaaS providers now deliver platform capabilities, such as databases and message queues, that allow applications to be built quickly using packaged building blocks.
Clouds are great for unpredictable or highly variable workloads because you pay only for what you use. But for more stable or predictable workloads, the cloud is not as economical. Renting is good for the short term or when you don’ t know what the future holds, but owning is more economical when you know you’ re going to stay in a place for a while.
In an interesting dynamic, cloud adoption appears to act like a slingshot. For a while, a business builds and deploys an application on a public cloud service. Then, when the application reaches a certain scale or becomes predictable, the business brings it back in‐house.
Increasing viability of public cloud
Early on, even with the analyst hype about public cloud decimating IT departments and forcing CIOs out of their jobs,
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