Introduction to microservices

Introduction to microservice

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Preface

For example, we shop online , First, you should go to the shopping website to search for goods , This search function can be developed into a microservice , We can also see the recommendation of related products , These recommendations can also be a micro service , Later, for example, add a shopping cart , Place the order , Payment and other functions can be developed into independent microservices

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One 、 Features of microservices ？

• Microservice is an architectural style
• Microservices divide an application into a group of small services
• Microservices each service runs in its own process , That is, independent deployment and upgrade
• Microservices use lightweight services between services http Interaction , In general use json Exchange data
• Microservices are divided around business functions
• It can be deployed independently by fully automated deployment mechanism
• De centralization , Service autonomy , Services can use different languages , Different storage mechanisms

Two 、 Microservice framework function

Microservices have these characteristics , So as a microservice framework , such as Spring Cloud , What functions does a have ？ The functions of microservice framework are mainly reflected in the following aspects .

1. Registry Center ： Service providers and consumers , Can register and get service information from the registry
2. Configuration center ： There are many services involved in the service architecture , Unified management of configuration files is required
3. Service link tracking ： For load calls between services , Need to track through the link , Get specific participants , If there is a problem with the call link, it can be quickly located
4. Load balancing ： The service invocation service will adopt a certain load balancing strategy , To ensure high availability of services
5. Service fault tolerance ： By fusing 、 Downgrade 、 Service fault tolerance policy , Protect the system effectively , Degradation occurs when a service or dependent service is abnormal , Return guaranteed data , Fusing refers to multiple failures of dependent services , Then the fuse opens , Not trying to call , Directly return the degradation information . Regularly detect service availability , If restored, call
6. The service gateway ： Conduct current limiting when the user requests overload 、 line up 、 Overload protection 、 Black and white list 、 Abnormal user filtering and interception can be realized through the service gateway
7. Service publishing and rollback ： Blue and green deployment 、 Grayscale 、AB Test Wait for the release strategy , Application can be rolled back quickly
8. Service dynamic scaling , Containerization ： According to the service load , Nodes can be added and reduced quickly manually or automatically