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Popular interpretation of what is cloud computing, many people do not understand, today, in order to let you know more about cloud computing, so give you a summary of the following content, let's look down together.

I have been in the cloud industry for some time, during which I met all kinds of people who asked, "what on earth is cloud computing?" . There are people who do HR, biology and design, and so on. This article is an attempt to unveil cloud computing in the most popular language. In fact, the goddess of cloud computing is not mysterious (refer to the book "Cloud Computing popular handouts" below, readers can refer to).

However, before officially unveiling cloud computing, you must first understand what software is and how IT systems are constructed. These two concepts are the premise and basis for understanding cloud computing.

So first of all, let me talk about software. Software is no stranger to us, how to define software easily? Software is actually a step written by a programmer to get CPU to complete a task. This step includes "input → to calculate → output". Let me give you a simple example. 1, 1, 2, 1, 3, 4, right? A program (that is, software) is equivalent to defining XroomY. You type 1 and 3, and you get 4; you type 7 and 8, and you get 15. This is the concept of software. The Storm Player we usually come into contact with is to process a pile of video code and turn it into an image to be displayed on the monitor; word is to process the signal entered by your keyboard, which is why it is converted into an word document. To sum up, software or programs are actually input, calculation, and output. Then the next is the composition of the IT system.

Figure 1 Software running model

The composition of the IT system usually has contact with everyone and is easy to understand. The schematic diagram is as follows. According to the book "Cloud Computing popular handouts", the IT system is divided into nine levels, which can be summarized into: infrastructure layer, platform software layer, application software layer and data information layer. I believe you can easily get to this point. It is noted that servers and virtual machines include CPU and memory, while network and hard disk are also a kind of computing resources.

After understanding the software and IT system structure, the concept of cloud is easy to understand. In a traditional computer, you enter a command, the program will be calculated on your own computer, and finally output to your own computer, such as you click with the mouse to run the browser command. Cloud computing puts the entire computing resources in the cloud, that is, input and output are separated from computing. You enter a command to be transmitted to the cloud through the network and then sent back, this is the concept of popular cloud computing. In this way, the three service models we often hear, IaaS/PaaS/SaaS, and the three deployment models, public cloud, private cloud, and hybrid cloud, are also easy to understand.

If what is open in the cloud is the infrastructure layer, that is, you log in to the cloud and see a bare metal is IaaS (infrastructure as a service). If the platform software layer (operating system, middleware, etc.) is open, it is PaaS (platform).

As a service). If the application layer is open, it is SaaS (software as a service).

What about the three deployment models? Public cloud is the common use of cloud resources, such as Amazon's AWS, Microsoft's Azure and Aliyun provide the most public cloud services. A private cloud is a cloud resource that you use by your own unit, such as deploying a data center in your own company, or hosting it elsewhere (such as Aliyun). Hybrid clouds are both. There is another concept called community cloud, but it is not often used in the actual business, so I will not repeat it here.

These are the concepts of cloud computing, as well as three service models and three deployment models. So you might ask, what are the advantages of cloud computing? Why is the enterprise in the cloud? Why does AWS's revenue of more than $20 billion still soar by more than 30% a year, while domestic Aliyun also has an annual revenue of more than 10 billion yuan? This is another topic. Generally speaking, the advantages of IT deployment in the cloud are flexible expansion, pay-on-demand, cost savings, and so on. For example, the major shopping websites are not down at 11: 00, and the contribution bikes during rush hour are still very smooth, which actually uses the elastic and scalable features of cloud computing. Computing is a capability, and cloud computing provides scalable and unlimited capabilities. Tmall Taobao is deployed on Aliyun, mobike is driven by Microsoft's Azure, and so on, which are all typical application models of cloud. We can see that the sales of traditional data centers and servers are gradually declining and are replaced by cloud computing and cloud data centers; but now there are almost no start-ups with traditional software, and most of the software industry is deployed in the cloud and uses the SaaS model to face the market.

Of course, there is another big topic. In fact, cloud computing is inseparable from the concepts of Internet of things, industrial 4.0, artificial intelligence and so on. If you put it on the big topic of enterprise digital transformation, you will find that there are many good combinations between many concepts. Cloud computing is productivity, big data is the means of production, and various algorithms are production tools. The Internet of things platform needs a cloud, the complex artificial intelligence big data engine needs to run in the cloud and so on. Cloud is an essential part of the next industrial revolution, that is, the digital revolution, which is why Huawei is willing to invest 1.5 billion yuan recently.

These are the details of cloud computing, and are there any gains after reading them? If you want to know more, welcome to the industry information!

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