云计算(Cloud Computing)是真实的，计算正在向云平台转移。尽管从技术的演进上来说，云计算还算不上是一次技术革命，但是，它对IT产业的影响算得上是革命性的。它不仅将影响我们应用IT的方式，更为重要的是，它很可能将引发IT产业新一轮的调整。究竟何谓云计算？它有哪些主要类型？云计算有哪些优劣势？随着云计算的逐渐推广，企业如何在维持原有预算水平不变的前提下搭建一个私有云架构来改进IT业务？本手册将对这些问题进行解答(Cloud computing (Cloud Computing) is real, and computing is being transferred to the Xiang Yun platform. Despite the technological revolution, cloud computing is not a technological revolution, but its impact on the IT industry is revolutionary. It will not only affect the way we apply IT, but more importantly, it will probably lead to a new round of adjustment in the IT industry. What is the cloud computing? What are the main types of it? What are the advantages and disadvantages of cloud computing? With the gradual promotion of cloud computing, how can enterprises build a private cloud architecture to improve the IT business under the premise of maintaining the same original budget level? These questions will be answered in this manual)