SpringCloud-Eureka

一、Eureka配置

①Eureka Server

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

@Slf4j
@SpringBootApplication
// eureka服务端
@EnableEurekaServer
public class EurekaMain7001 {

    public static void main(String[] args) {
        SpringApplication.run(EurekaMain7001.class,args);
        log.info("=====================Eureka7001服务启动成功！=====================");
    }
}

server:
  port: 7001
  servlet:
    context-path: /eureka
eureka:
  instance:
    hostname: localhost #eureka服务端的实例名称
  client:
    register-with-eureka: false #false表示不向注册中心注册自己
    fetch-registry: false #fasle表示自己就是注册中心，我的职责就是维护服务实列，并不需要去检索服务
    service-url:
        #设置与Eureka server交互的地址查询服务器和注册服务都需要依赖这个地址
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

②Client

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

@Slf4j
@SpringBootApplication
@EnableEurekaClient
public class PaymentMain8001 {

    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8001.class,args);
        log.info("========支付服务8001启动成功！======");
    }
}

# 注册中心
eureka:
  client:
    register-with-eureka: true # 表示是否将自己注册进Eureka Server默认true
    # 是否从EurekaServer中抓取已有的注册信息，默认为true。单点登录无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka/

二、特性

心跳：30s

三、相关问题

1.Eureka报警：EMERGENCY! EUREKA MAY BE INCORRECTLY CLaimING INSTANCES ARE UP WHEN They'RE NOT. renewalS ARE LESSER THAN THRESHOLD AND HENCE THE INSTANCES ARE NOT BEING EXPIRED JUST TO BE SAFE.

紧急!Eureka可能错误地声称实例已经启动，而实际上它们并没有。更新小于阈值，因此实例不会过期，只是为了安全。

这是Eureka自我保护机制，