What are the three service models of cloud computing?

Three service models: 1. Software as a service is a model that provides software through the Internet. Users do not need to purchase software, but rent Web-based software from providers to manage business activities; 2 . Platform as a Service is a service category that provides developers with a platform to build applications and services through the global Internet; 3. Infrastructure as a Service is a business that allocates hardware resources such as data centers and infrastructure to users through the Web. mode, consumers can obtain services from complete computer infrastructure through the Internet.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Cloud computing is a type of distributed computing, which refers to the decomposition of huge data computing processing programs into countless small programs through the network "cloud", and then through multiple servers. The system processes and analyzes these applets to get results and returns them to the user. In the early days of cloud computing, to put it simply, it was simple distributed computing, solving task distribution and merging calculation results. Therefore, cloud computing is also called grid computing. Through this technology, tens of thousands of data can be processed in a very short time (a few seconds), thereby achieving powerful network services.

The cloud service mentioned at this stage is not just a kind of distributed computing, but also computer technologies such as distributed computing, utility computing, load balancing, parallel computing, network storage, hot backup redundancy and virtualization. The result is a mix that evolves and leaps forward.

Cloud computing service model

Currently, there are three main service models of cloud computing. They are: Infrastructure as a Service ( IaaS), Platform as a Service (PaaS) and Software as a Service (SaaS). The so-called layer here is "layer" in the sense of layered system architecture. IaaS, PaaS, and SaaS are implemented at the infrastructure layer, software open operation platform layer, and application software layer respectively.

(1) Software as a Service (SaaS)

SaaS (Software-as-a-Service): Software as a Service. It is a model that provides software through the Internet. Users do not need to purchase software, but rent Web-based software from providers to manage business activities.

Application software is deployed uniformly on its own server. Enterprise file sharing users order application software services from manufacturers through the Internet based on their needs. The service provider charges based on factors such as the quantity of software ordered by the customer, the length of time, etc., and charges through A model in which browsers deliver software to clients. The advantage of this service model is that the service provider maintains and manages the software and provides hardware facilities for running the software. Users only need to have a terminal that can access the Internet to use the software anytime and anywhere.

The SaaS model greatly reduces the cost of using software, especially large-scale software, and because the software is hosted on the service provider's server, it reduces the customer's management and maintenance costs and has higher reliability.

(2) Platform as a Service (PaaS)

PaaS (Platform-as-a-Service): Platform as a service is a service category for development People provide a platform for building applications and services over the global Internet. Paas provides an on-demand development environment for developing, testing and managing software applications.

PaaS actually refers to using the software development platform as a service and submitting it to users in the SaaS model. Therefore, PaaS is also an application of the SaaS model. However, the emergence of PaaS can accelerate the development of SaaS, especially the development speed of SaaS applications. PaaS services allow software developers to develop new applications without purchasing equipment environments such as servers.

Provide the platform and development environment as a service. Enterprise file sharing is a distributed platform service. The manufacturer provides development environment, server platform, hardware resources and other services to customers. Users customize and develop their own applications based on its platform and pass them to other customers through its server and the Internet. .

(3) Infrastructure as a Service (IaaS)

IaaS (Infrastructure-as-a-Service): Infrastructure as a service, consumers can access it from Complete computer infrastructure to obtain services. IaaS is a business model that allocates hardware resources such as data centers and infrastructure to users through the Web.

IaaS is a "cloud" infrastructure composed of multiple servers that is provided to customers as a metering service. It integrates memory, I/O devices, storage and computing capabilities into a virtual resource pool to provide the entire industry with needed storage resources and virtualized servers and other services.

The relationship between the three modes

We can analyze the relationship between the three service models from two aspects: one is the user experience perspective, and the other is the technical perspective. From a user experience perspective, they are independent of each other because they face different types of users. From a technical perspective, the relationship between them is not a pure inheritance relationship. For example, SaaS is based on PaaS, and PaaS is based on IaaS. First of all, SaaS can be deployed on PaaS or directly on IaaS. Secondly, PaaS can be built on IaaS or directly on physical resources.

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