Ribbon usage in Spring Cloud applications

A load balancer provides at least the following functions:

• To maintain the IP and other information of each server

• According to specific Logical selection of servers

In order to achieve basic load balancing functions, Ribbon's load balancer has three major sub-modules:

• Rule

• Ping

• ServerList

When Ribbon is used in SpringCloud, the configuration can be done in two ways, one One is Java configuration and the other is configuration file configuration.

Configuration through java:

package com.hurricane.learn.springcloud.ribbon;

import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.context.annotation.Bean;

@RibbonClient(name="user-service-provider",configuration=MyConfig.class)
public class MyConfig {
	
	@Bean
	public MyRule createMyRule() {
		return new MyRule();
	}

}

Configuration file configuration:

#自定义规则的使用
user-service-provider.ribbon.NFLoadBalancerRuleClassName=com.hurricane.learn.springcloud.ribbon.MyRule

A pitfall of service calls:

Test calls between services, keep calling Unsuccessful, prompt:

Request URI does not contain a valid hostname: http://user_service_provider/getUser

Finally found out that it was because the service instance name cannot have underscores. You can access it by changing the instance name to aaa.

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