Refer to the Spring Cloud course of Shang Silicon Valley, have made some notes, complete code:https://github.com/yao09605/mscloud

What is EUREKA?

The service call relationship between the micro service architecture is more complicated, so a service registration center is enabled, and the registration of the unified management service is enabled. You can achieve service call, service discovery, and registration.

EUREKA cluster principle

Several machines are registered with each other, and there are registration forms of all services on each machine.

Newly built two modules as the EUREKA server

cloud-eureka-server7001 cloud-eureka-server7002
Two Module basically copy paste

POM added as follows

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>

Profile: main / resources / application.yml

server:
  port: 7001 # Another file into 7002

eureka:
  instance:
    hostname: eureka7001.com # Another file into erbeka7002.com
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://eureka7002.com:7002/eureka/ # Another file into http://eureka7001.com:7001/Eureka/

Modify the HOSTS file (the local simulation configuration)

127.0.0.1  eureka7001.com
127.0.0.1  eureka7002.com

Master start class Add: @enableeeurekaserver

package org.example.mscloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaMain7001 {
    public static void main(String[] args) {
        SpringApplication.run(EurekaMain7001.class, args);
    }
}

Register your service on EUREKA

Add the following dependence on the POM

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

YML increase configuration

spring:
  application:
    name: cloud-payment-service #Service Name

eureka:
  client:
    register-with-eureka: true
    fetchRegistry: true
    service-url:  #eureka server address
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
  instance:
    instance-id: payment8001 #        
    prefer-ip-address: true  #         i i

Main start plus @enableeeurekaclient

@EnableEurekaClient
@SpringBootApplication
public class PaymentMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8001.class,args);
    }
}

Caller

POM Add dependence

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

The caller is no longer directly toned, and the service name is used:

public static final String PAYMENT_URL="http://CLOUD-PAYMENT-SERVICE";