1. Basic Concepts
- Definition : Cloud computing, the English name cloud computing is a kind of distributed computing. The original huge amount of data is decomposed into small pieces through the network, and then processed and analyzed through a system composed of servers, and finally returned to the user for the calculated result.
- Essence : Where is the "cloud" of cloud computing reflected? To put it bluntly, this is a new way to obtain cloud resources, but the resources have changed from the previous purchase to the current lease.
2. Deployment form
- Cloud computing can be divided into three categories according to the deployment form: public cloud, hybrid cloud, and private cloud.
- Public cloud : generally available through the Internet, may be free or low-cost, the core attribute is a shared resource service, emphasizing elasticity and sharing.
- Private cloud : It is a computing service built in the enterprise's own data center for the internal organization of the enterprise.
- Hybrid cloud : It integrates public cloud and private cloud, and is the main mode and development direction of cloud computing in recent years.
3. The tide
- The title is called the third wave of cloud computing, so what are the previous waves, and what kind of development will this time bring.
1. Infrastructure as a Service (IaaS)
Iaas is a model in which infrastructure as a service is sold externally through the network, and services are billed according to the actual usage or occupancy of resources by users.
Under this mode, users do not need to work hard on hardware themselves, but provide computer infrastructure services through manufacturers, including servers, storage and network services, mainly for professional IT personnel.
2. Software as a Service SaaS
- Saas is a platform provider that uniformly deploys application software on servers. Customers can use ready-made services to manufacturers through the Internet according to their own needs, mainly for sales, finance, HR and other professionals
3. Platform as a Service (PaaS)
- PaaS is a business model that provides a server platform as a service. If you want to build a website and make it accessible to others. Then you may choose the server concession of cloud platforms such as Alibaba Cloud and Tencent Cloud, mainly for IT developers.
Fourth, the low-code era
- Why are these services now able to push cloud computing to a new level?
- Due to the combination of low-code and PaaS, PaaS empowers everyone, and low-code enables everyone to program, which is triggering the third wave of cloud computing.
- Low-code is a technology that requires little coding to use. A low-code development platform uses a visual interface with simple logic and drag-and-drop functionality instead of using a lot of coding language.
5. Advantages of cloud computing
- Compared with traditional computing, cloud computing is developing and growing mainly for the following reasons:
1. Large scale
- In 2019, the overall market size of cloud computing in my country was 133.4 billion yuan, and in 2019, there were 367.21 million employees in my country's tertiary industry.
- According to the data of the Academy of Information and Communications Technology and the calculation of the Alibaba Cloud Research Center, in the next five years, from 2021 to 2025, the total cloud computing market size will reach 2.0 trillion yuan.
2. Virtualization
- There are many ways to implement virtualization technology, such as software virtualization, hardware virtualization, full virtualization, and paravirtualization according to the degree and level of virtualization.
- Only one laptop is needed, which can support users to obtain services through the terminal anytime, anywhere.
3. High reliability
- Cloud computing uses measures such as multi-copy fault tolerance, isomorphic and interchangeable computing nodes to ensure the security of data, and will not cause data leakage or loss due to attacks.
4. Versatility
- Cloud computing is not aimed at specific applications. With the support of the "cloud", various applications can be constructed. The same "cloud" can support the operation of different applications at the same time.
5. Low cost
- Cloud computing uses extremely cheap nodes to form the cloud, and the automated management of the platform greatly reduces the cost of data center management.