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What is the role of Ribbon in SpringCloud, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

Spring Cloud Ribbon is a client-side load balancing tool based on TCP and HTTP and implemented based on Netflix Ribbon. Although it is a tool framework, unlike service registries, gateways, etc., it exists in almost every micro-service architecture and infrastructure built by Spring Cloud. The invocation between micro-services and the request forwarding of API network view are actually realized through Ribbon. Including Feign, which we often use, is also a tool that relies on Ribbon to implement.

Client load balancing

Load balancing is very important in the system architecture and has to be implemented. Load balancing is an important means of high availability of the system, treatment of network pressure, and system expansion. What we usually call load balancing refers to the server-side complex balancing. Such as conventional hardware load balancing F5, and software load balancing Nginx and so on. All of these will maintain a list of available servers in the software module, and eliminate the faulty nodes through heartbeat detection to ensure that the list is full of available server nodes. When the client sends a request to the load balancer device, the modified device takes a server address from the list of available services maintained according to a certain algorithm (linear polling, polling by weight, traffic load, random, etc.) and forwards it.

The biggest difference between client-side load balancing and server-side load is where the service list is stored. In client load balancing, all client nodes maintain a list of servers to be accessed. The data comes from a registry, such as an Eureka server. In the client-side load balancer, the heartbeat is also required to maintain the health of the server list. By default, automatic Ribbon integration configurations for various service governance frameworks, such as org.springframework.cloud.netflix.ribbon.eureka.RibbonEurekaAutoConfiguration in Eureka, are created.

Through the encapsulation of Spring Cloud Ribbon, it is very simple to use client-side load balancer in the micro-service architecture, which only takes two steps:

1. The service provider registers with the service registry.

two。 The service consumer directly invokes the service-oriented interface invocation by invoking the RestTemplete modified by the @ LoadBalance annotation.

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