Eureka | 狼哥博客

SpringCloud 之Eureka:

1: Eureka提供了一系列REST的API，供Eureka Client来调用，实现服务注册，注销，心跳，状态更新等等操作
2: Eureka属于客户端发现, 如果希望用服务端发现,则用nginx.

服务端配置:
1: 添加依赖

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

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

</dependency>

2: 配置application.yml

spring:
  application:
    name: eureka    #定义服务器名字
server:
  port: 8620        #Eureka的默认端口
eureka:
  client:           #自己注册为自己的客户端
    service-url:
      defaultZone: http://localhost:8620/eureka/
    register-with-eureka: false
  server:
    enable-self-preservation: false #开发可以关掉, 服务器不要关闭

spring:

application:

name: eureka #定义服务器名字

server:

port: 8620 #Eureka的默认端口

eureka:

client: #自己注册为自己的客户端

service-url:

defaultZone: http://localhost:8620/eureka/

server:

enable-self-preservation: false #开发可以关掉, 服务器不要关闭

3: 在项目的application.java中启用EurekaServer
@EnableEurekaServer

说明:
1: 参考文档:https://yq.aliyun.com/articles/138261
2: register-with-eureka: 是否把自己显示在Eureka上, 作为客户端
enable-self-preservation: 关闭自我保护模式, 保护模式主要用于一组客户端和Eureka Server之间存在网络分区场景下的保护。一旦进入保护模式，Eureka Server将会尝试保护其服务注册表中的信息，不再删除服务注册表中的数据（也就是不会注销任何微服务).
开发时可以关掉, 服务器不要关闭

客户端配置:
1: 添加依赖

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

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

2: 配置application.yml

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8620/eureka/

eureka:

client:

service-url:

defaultZone: http://localhost:8620/eureka/

3: 在项目的application.java中启用Client
@EnableEurekaClient

实现Eureka高可用性:
通过互相注册
1: 在Eureka服务端, 增加N个(例如eureka1, eureka2, eureka3),
2: 在eureka1的service-url的defaultZone: http://localhost:8620/eureka2/,http://localhost:8620/eureka3/
3: 在eureka客户端中, 把所有的服务注册中心都填进去

如何在注册中心关闭eureka
1: pom中增加依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-actuator</artifactId>

</dependency>

2: yml中增加

management:
  endpoints:
    web:
      exposure:
        include: info, health, shutdown

management:

endpoints:

web:

exposure:

include: info, health, shutdown

或者只打开关闭

management:
    endpoint:
        shutdown:
            enabled

management:

endpoint:

shutdown:

enabled

3: 执行post命令
curl -X POST localhost:8080/actuator/shutdown