eureka

• Java: 8
• SpringBoot: 2.6.3
• SpringCloud: 2021.0.0

ENV

• JAVA_OPTS: ""
• JAVA_HEAP_OPTS: "-Xms2g -Xmx2g"
• SERVER_PORT: 8001
• EUREKA_instance_hostname: eureka-1
• EUREKA_CLIENT_SERVICEURL_DEFAULTZONE: http://eureka-2:8002/eureka/,http://eureka-3:8003/eureka/
• EUREKA_CLIENT_REGISTERWITHEUREKA: "true"
• EUREKA_CLIENT_FETCHREGISTRY: "true"

使用

Eureka为AP，Zookeeper为CP。 zk需要过半存活才可使用，eureka只要有一个存活就可使用。因此独立部署或者组成集群均可保障高可用

Standalone Mode

• 关闭EurekaServer中的Client注册行为。镜像默认为关闭默认。
• EurekaClient向多个EurekaServer进行注册

version: '3'
services:
  eureka-1:
    build: .
    restart: always
    ports:
      - "8001:8001"
    environment:
      SERVER_PORT: 8001
      EUREKA_instance_hostname: eureka-1
  eureka-2:
    build: .
    restart: always
    ports:
      - "8002:8002"
    environment:
      SERVER_PORT: 8002
      EUREKA_instance_hostname: eureka-2
  eureka-3:
    build: .
    restart: always
    ports:
      - "8003:8003"
    environment:
      SERVER_PORT: 8003
      EUREKA_instance_hostname: eureka-3

Peer Awareness

• 开启EurekaServer中的Client注册行为
• EurekaClient向任意一个EurekaServer进行注册，会被扩散到所有EurekaServer

version: '3'
services:
  eureka-1:
    build: .
    restart: always
    ports:
      - "8001:8001"
    environment:
      SERVER_PORT: 8001
      EUREKA_CLIENT_SERVICEURL_DEFAULTZONE: http://eureka-2:8002/eureka/,http://eureka-3:8003/eureka/
      EUREKA_CLIENT_REGISTERWITHEUREKA: "true"
      EUREKA_CLIENT_FETCHREGISTRY: "true"
      EUREKA_instance_hostname: eureka-1
  eureka-2:
    build: .
    restart: always
    ports:
      - "8002:8002"
    environment:
      SERVER_PORT: 8002
      EUREKA_CLIENT_SERVICEURL_DEFAULTZONE: http://eureka-1:8001/eureka/,http://eureka-3:8003/eureka/
      EUREKA_CLIENT_REGISTERWITHEUREKA: "true"
      EUREKA_CLIENT_FETCHREGISTRY: "true"
      EUREKA_instance_hostname: eureka-2
  eureka-3:
    build: .
    restart: always
    ports:
      - "8003:8003"
    environment:
      SERVER_PORT: 8003
      EUREKA_CLIENT_SERVICEURL_DEFAULTZONE: http://eureka-1:8001/eureka/,http://eureka-2:8002/eureka/
      EUREKA_CLIENT_REGISTERWITHEUREKA: "true"
      EUREKA_CLIENT_FETCHREGISTRY: "true"
      EUREKA_instance_hostname: eureka-3

测试方式

curl http://localhost:8001/eureka/apps

配置说明

健康检测

依赖actuator. 确认pom.xml中包含相关依赖

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

测试请求

curl http://localhost:8761/actuator/health

构造镜像

构造jar包

mvn clean install -Dmaven.test.skip

Docker镜像

docker build -t geenlubcn/eureka:v1 .

多中心

docker-compose up

其他

• https://cloud.spring.io/spring-cloud-netflix/reference/html/#spring-cloud-eureka-server