eureka集群搭建

简介

用作注册中心的，类似zk。zk实现的是CP，eureka实现的是AP。因为注册中心数据变化不大，而数据可靠性要求较高，所以eureka更适合做注册中心。

使用方式

1.pom文件中增加eureka依赖

因为它是一个纯java的项目，所以需要容器启动，目前基本上都是基于springboot项目启动

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

2.spring application启动类中增加注解

@EnableEurekaServer

3.application.yml中增加配置

server:
  port: 8761
spring:
  application:
    name: eureka-master
eureka:
  instance:
    hostname: localhost
    prefer-ip-address: true
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url: 
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

4.集群配置

如果是集群版的，不能用ip，且application.name必须是同一个,register-with-eureka、fetch-registry必须设置成true,参考配置，底部有配置好的附件

spring:
  profiles:
  - node1
  application:
    name: eureka-master
eureka:
  instance:
    hostname: eureka-master1
    prefer-ip-address: false
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://eureka-master2:8762/eureka/,http://eureka-master3:8763/eureka/
server:
  port: 8761
---

spring:
  profiles:
  - node2
  application:
    name: eureka-master
eureka:
  instance:
    hostname: eureka-master2
    prefer-ip-address: false
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://eureka-master1:8761/eureka/,http://eureka-master3:8763/eureka/
server:
  port: 8762
  
---
spring:
  profiles:
  - node3
  application:
    name: eureka-master
eureka:
  instance:
    hostname: eureka-master3
    prefer-ip-address: false
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://eureka-master1:8761/eureka/,http://eureka-master2:8762/eureka/
server:
  port: 8763