Shulou(Shulou.com)05/31 Report--

In this issue, Xiaobian will bring you about how to get started with the basic concept of Serverless. The article is rich in content and analyzes and narrates from a professional perspective. After reading this article, I hope you can gain something.

What is Serverless?

Serverless, according to Chinese translation, is called "serverless."

What kind of form or product is this? No servers, is there really no server?

In fact, in the industry, there are currently several ways to interpret Serverless:

In some scenarios it can be interpreted as an approach to software systems architecture, often referred to as Serverless architecture.

In other cases, it can represent a product form called Serverless product.

When talking about Serverless architecture, Serverless represents the application architecture realized by products in Serverless form, which completely relies on cloud vendors or cloud platforms to provide products to complete the organization and construction of the system. In this architecture, users do not need to pay attention to the host that supports the operation of application services, but focus on system architecture, business development, and business support operations.

When it comes to Serverless products, it means products that don't need to understand and manage servers, use them on demand, and pay for them. Serverless products can also include storage, computing and other types of products. A typical computing product is a cloud function.

Cloud functions, or Function as a Service, together with Backend as a Service, can be referred to as Serverless products. By combining these products, developers can build their own business Serverless architecture.

Serverless Value

Why is Serverless technology gaining more and more attention? We can look at it from several angles.

First of all, from the perspective of developers, there is no need to consider more about the relevant content of the server, and there is no need to consider the size, storage type, network bandwidth, and automatic expansion and contraction of the server. At the same time, there is no need to carry out operation and maintenance on the server, no need to constantly patch the system, apply patches, no need to carry out data backup, software configuration and other work.

Second, Serverless products are fully automated and flexible. At peak times, the computing capacity and capacity of the product will automatically expand to carry more user requests, while when the business declines, the resources used will shrink at the same time to avoid resource waste.

Again, with the flexibility of full automation comes a whole new metering model. Developers only pay according to usage, and in the case of no traffic at night, there will be no idle resource occupation, so there will be no cost.

Along with the features mentioned above, Serverless brings concrete business value to developers or users:

1. Reduce operational requirements

Serverless decouples applications from servers, eliminating the need to estimate resources and purchase and configure servers before launching services

Serverless also further reduces the workload of low-level operation and maintenance. After the service goes online, there is no need to worry about server operation and maintenance. Instead, it is all handed over to cloud platforms or cloud vendors.

2. reduce operating costs

Serverless applications are executed on demand. Applications are loaded and run only when there are requests to process or events to trigger. Serverless applications do not consume computing resources in idle state.

When using Serverless products, users only pay for computing resources to process requests, not for resource consumption during idle periods of the application

3. Shorten iteration cycle and launch time

Serverless architecture brings further business decoupling, application functions are deconstructed into several fine-grained stateless functions, and development can focus on rapid development and online of single functions.

At the same time, the disassembled cloud functions can also be independently iterated and upgraded, so as to realize business iteration more quickly and reduce the time to market of functions.

4. quick trial and error

With simple O & M, low cost and fast go-live capability of Serverless architecture, you can quickly try out new forms and functions of your business.

Take advantage of the strong elastic expansion capability of Serverless products, and when the business is successful, there is no need to worry about resource expansion.

Serverless Technical Features

The technical features mentioned here refer to computing products in Serverless products, that is, cloud functions. Cloud functions contain the following technical characteristics:

1. event-driven

Cloud function operation is event-driven. When an event arrives, cloud function will start operation.

Serverless apps don't stay online like the old "Listen-Process" type apps, they start on demand.

Event definitions can be very rich, an http request, a file upload, a database entry modification, a message sent, can be defined as an event

2. single event processing

Cloud functions are triggered by events, and a cloud function instance triggered to start processes only one event at a time.

No need to consider high concurrency and high reliability within the code, code can focus on business, development is simpler

Achieve high concurrency of business through high concurrency capability of cloud function instances

3. Auto Scaling

Due to the event-driven and single-event handling characteristics of cloud functions, cloud functions support high concurrency of services through automatic scaling.

Cloud functions automatically flex appropriate processing instances to carry the actual traffic volume for the actual number of events or requests for the service

When there are no events or requests, there is no instance running and no resources are consumed.

4. stateless development

Cloud functions may scale to 0 according to business elasticity during runtime, and state data cannot be saved in the runtime environment

In distributed application development, it is necessary to keep the application stateless in order to scale horizontally.

External services, products, such as databases or caches, can be used to preserve state data

Serverless application scenarios

Serverless architecture or technology, what kind of scenarios can be used to give full play to its advantages? The following scenarios are suitable for using Serverless architecture or products to implement the required business logic.

1. WEB and mobile backend

By combining cloud functions with API gateways or HTTP triggers, URL access addresses can be provided to the outside world and become back-end services for Web, Mini programs, or mobile applications. Serverless architecture can be used directly to build background to serve applications, or it can be used to build bridges between middle platforms and applications through similar BFF patterns.

Serverless architecture provides strong flexibility to support business or application growth; low O & M requirements allow developers to focus on business implementation and optimization; and pay-per-use allows developers to avoid pre-configured resources and worry about pre-configured resource waste.

2. message processing

Serverles architecture applications are themselves event-triggered and therefore ideally suited for message processing. Whether it is business messages delivered in message queues or application logs collected in Kafka, they can be connected to cloud functions for real-time message processing and analysis.

3. Object Storage File Handling

In Serverless application scenarios, it is also a common scenario that the file upload event in the object storage triggers the cloud function to run.

For the upload of image files, thumbnail generation, two-dimensional code or watermark marking, and image optimization can be completed by cloud functions; for the upload of data files, automatic analysis of data can be started.

4. Internet of Things

The Internet of Things means that thousands of devices will be connected to the network and constantly generate data, which poses a high challenge to the timeliness of data analysis and processing. By using Serverless architecture, the data collected by IoT devices can be used as trigger events for cloud functions, enabling real-time processing, analysis and application of data.

With the further improvement of the computing power of IoT devices, cloud functions, as the smallest granularity computing units, have the opportunity to be dispatched to the device side to implement edge computing and achieve a Serverless architecture of "end-cloud" union.

5. Operation and integration

By connecting cloud functions and various products, log services and monitoring alarm systems on the cloud, the operation and maintenance of the cloud era can also be built with cloud functions. Timed cloud functions will be convenient substitutes for timed tasks that need to be run on the host, while log or alarm triggered cloud functions will be able to respond and process events in the cloud immediately.

Serverless -Applications in the Cloud Native Era

Cloud computing has entered a new era. At present, cloud is not a question of whether or not it should be, but how to get on the cloud. In this case, the concept of cloud-origin was born. Cloud-native architectures or applications are cloud-based designs that take full advantage of the elastic and distributed nature of modern cloud computing platforms to implement application architectures.

Serverless architecture, products, and applications are built entirely on the cloud, and are typical and completely cloud-native architectures, products, or applications. Serverless products have the advantages of product features, technology, cost, etc., which will become the development direction of the new generation of cloud products; and the application or architecture based on Serverless architecture will fully enjoy the powerful power brought by the cloud era, making cloud computing truly a business booster.

**Serverless computing products-cloud functions, as the next generation computing form after cloud virtual machines and container technologies, will lead to a new upsurge in cloud computing. ** Product capabilities, tools, ecosystems, and application development built around cloud functions will also lead to a new round of development. As serverless products and ecosystems mature, they will gradually carry the core business of the enterprise. In this process of continuous and rapid development, the cloud function of Tencent Cloud (Cloud) will serve as the original key power field of Tencent Cloud, following customer demand, industry development and technology development, and providing complete Serverless solutions for users.

The above is how to get started with the basic concept of Serverless shared by Xiaobian. If you happen to have similar doubts, you may wish to refer to the above analysis for understanding. If you want to know more about it, please pay attention to the industry information channel.

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