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This article mainly explains "what are the basic knowledge points of cloud computing". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what are the basic knowledge points of cloud computing"?

The availability and integrity of data are fundamental for users to use cloud services. Cloud computing has developed rapidly in various application fields in recent years because of the characteristics of on-demand service, resource pool sharing, charging by service and so on. The development of computer has experienced the stages of host system and centralized computing, utility computing, personal computer and desktop computing, distributed computing, grid computing, software as a service (Software as a Service,SaaS), cloud computing and so on. From the perspective of the evolution of the computing model, it has the characteristics of centralization, decentralization and centralization.

1. What is cloud computing?

Cloud computing provides computing power, database storage, applications and other IT resources on demand through the Internet cloud service platform, using the on-demand pricing model.

Whether you are running a photo-sharing application with millions of mobile users or supporting critical operations of your business, the cloud services platform gives you quick access to flexible and low-cost IT resources.

With cloud computing, you don't have to invest a lot of money in hardware up front, and then spend a lot of time maintaining and managing it. In contrast, you can precisely configure the appropriate type and size of computing resources you need to power your new ideas, or help run your IT department. You can access as many resources as you need, basically in real time, and you only need to pay according to the actual usage.

two。 How does cloud computing work?

Cloud computing accesses servers, storage space, databases, and various application services through Internet in a simple way. Cloud service platforms such as Amazon Web Services own and maintain the networking hardware needed for such application services, and you only need to use Web applications to configure and use the resources you need.

Originally set up the server on its own host, now through the network, remote access to the cloud, the cloud deployment of the server is like in the local. The local is similar to the client. Buy cloud-based service capabilities.

3. Advantages of Cloud Computing

Turn capital investment into variable investment: instead of investing heavily in building data centers and servers, use cloud services, so that you only have to pay for computing resources and pay according to your usage. The advantage of large-scale economies of scale: the cloud brings together thousands of customers, so providers like AWS can take advantage of economies of scale to translate this feature into lower pay-per-use prices. No need to guess capacity: you can access resources of any size, more or less, and expand or shrink as needed, everything can be done in a few minutes. If you build it yourself, you have to count in advance, which means that more resources are idle and less trouble to expand. Increase speed and flexibility: in a cloud computing environment, new IT resources can be configured at the click of a mouse, significantly saving time and greatly reducing the time it takes for developers to deploy resources. Stop investing in the operation and maintenance of your data center: focus on projects that make your company different, not infrastructure. Cloud computing allows you to focus on your customers and remove the heavy work of installing and maintaining servers. Expand your business globally every minute: with just a few clicks, you can easily deploy your application in multiple regions around the world. In other words, you can easily help your customers get lower latency and a better experience with the least cost. For example, apply for cloud services in North America, Asia and so on.

4. Types of cloud computing

Cloud computing allows developers and IT departments to devote themselves to the most valuable work, avoiding the distraction of worthless work such as procurement, maintenance, and capacity planning. Cloud computing has become increasingly popular, and several different models and deployment strategies have emerged to meet the specific needs of different users. Each type of cloud service and deployment method provides different levels of control, flexibility, and management capabilities.

The cloud computing model is represented by a block diagram:

The following are represented in the figure: underlying IT resources, system platform, and application

There are three types based on visibility to users:

(1) Infrastructure as a Service (Infrastructure as a Service, IaaS)

IaaS contains the basic building blocks of cloud IT and typically provides access to networking capabilities, computers (virtual or dedicated hardware), and data storage space. IaaS provides the highest level of flexibility and management control over IT resources, and its mechanism is closest to the existing IT resources that many IT departments and developers are familiar with today. The lowest level is visible to the user, who installs the operating system. As shown below:

(2) platform as a Service (Platform as a Service, PaaS)

Platform as a Service eliminates the need for organizations to manage the underlying infrastructure (typically hardware and operating systems), allowing you to focus more on the deployment and management of applications. This helps improve efficiency because you don't have to worry about resource acquisition, capacity planning, software maintenance, patch installation, or any hard work that doesn't generate value related to the running of the application. For example, to give you a virtual machine to use, you can deploy the service on it. The figure is as follows:

(3) Software as a Service (Software as a Service, SaaS)

Software as a service provides a complete product, and its operation and management are the responsibility of the service provider. What people usually call software as a service refers to end-user applications. When using SaaS products, you don't have to worry about the maintenance of services or the management of the underlying infrastructure, you just need to think about how to use SaaS software.

The common application of SaaS is Web-based email, in which you can send and receive email without managing the addition of features to the email product or maintaining the server and operating system on which the email program is running. For example, to use mindmanager this software, originally to install a Windows system, and then install the software, now the cloud directly provides the service, just open the web page, direct operation. The figure is as follows:

5. Cloud solutions, cloud products and services

AWS provides targeted liberation programs for the government, institutions, enterprises, individual users and so on. It can solve various services such as website, mobile application, database backup and recovery.

Currently, the number one cloud computing provider in the world is Amazon's AWS. The famous ones in the domestic industry are Aliyun, Jinshanyun, Tencent Cloud and so on. Huawei founded Cloud BU in 17 years and began to lay out the cloud computing industry.

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