Spring Cloud Eureka搭建高可用集群过程图解

Spring Cloud Eureka是Spring Cloud生态系统中的一个组件，它提供了服务注册和发现的功能。本攻略将详细讲解Spring Cloud Eureka搭建高可用集群的过程，包括搭建Eureka Server集群、搭建Eureka Client集群等内容，并提供两个示例说明。

搭建Eureka Server集群

搭建Eureka Server集群需要完成以下步骤：

1. 创建Eureka Server项目

$ mkdir eureka-server
$ cd eureka-server
$ gradle init --type java-library

1. 添加Eureka Server依赖

dependencies {
    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-server'
}

1. 配置Eureka Server

server:
  port: 8761

eureka:
  instance:
    hostname: localhost
  client:
    register-with-eureka: false
    fetch-registry: false
  server:
    enable-self-preservation: false
    eviction-interval-timer-in-ms: 30000
    wait-time-in-ms-when-sync-empty: 0
  cluster:
    name: eureka-cluster
    peer-eureka-nodes-refresh-interval-ms: 5000
    peer-node-read-timeout-ms: 3000
    peer-node-connect-timeout-ms: 3000
    peer-node-total-connections: 100
    peer-node-total-connections-per-host: 100
    peer-node-connection-idle-timeout-seconds: 30

在上面的示例中，我们定义了一个Eureka Server，它监听8761端口，并关闭了自我保护机制。同时，我们定义了一个Eureka集群，包括多个Eureka Server节点。

1. 启动Eureka Server

$ ./gradlew bootRun

1. 复制Eureka Server

$ cp -r eureka-server eureka-server-2

1. 修改Eureka Server配置

server:
  port: 8762

eureka:
  instance:
    hostname: localhost
  client:
    register-with-eureka: false
    fetch-registry: false
  server:
    enable-self-preservation: false
    eviction-interval-timer-in-ms: 30000
    wait-time-in-ms-when-sync-empty: 0
  cluster:
    name: eureka-cluster
    peer-eureka-nodes: http://localhost:8761/eureka/,http://localhost:8762/eureka/
    peer-eureka-nodes-refresh-interval-ms: 5000
    peer-node-read-timeout-ms: 3000
    peer-node-connect-timeout-ms: 3000
    peer-node-total-connections: 100
    peer-node-total-connections-per-host: 100
    peer-node-connection-idle-timeout-seconds: 30

在上面的示例中，我们复制了一个Eureka Server，并修改了它的端口和peer-eureka-nodes配置。

1. 启动Eureka Server

$ ./gradlew bootRun

搭建Eureka Client集群

搭建Eureka Client集群需要完成以下步骤：

1. 创建Eureka Client项目

$ mkdir eureka-client
$ cd eureka-client
$ gradle init --type java-library

1. 添加Eureka Client依赖

dependencies {
    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'
}

1. 配置Eureka Client

server:
  port: 8080

spring:
  application:
    name: service-provider

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/

在上面的示例中，我们定义了一个Eureka Client，它监听8080端口，并注册到Eureka Server集群中。

1. 启动Eureka Client

$ ./gradlew bootRun

1. 复制Eureka Client

$ cp -r eureka-client eureka-client-2

1. 修改Eureka Client配置

server:
  port: 8081

spring:
  application:
    name: service-provider

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/

在上面的示例中，我们复制了一个Eureka Client，并修改了它的端口和defaultZone配置。

1. 启动Eureka Client

$ ./gradlew bootRun

示例说明

示例一：搭建Eureka Server集群

以下是搭建Eureka Server集群的示例：

server:
  port: 8761

eureka:
  instance:
    hostname: localhost
  client:
    register-with-eureka: false
    fetch-registry: false
  server:
    enable-self-preservation: false
    eviction-interval-timer-in-ms: 30000
    wait-time-in-ms-when-sync-empty: 0
  cluster:
    name: eureka-cluster
    peer-eureka-nodes-refresh-interval-ms: 5000
    peer-node-read-timeout-ms: 3000
    peer-node-connect-timeout-ms: 3000
    peer-node-total-connections: 100
    peer-node-total-connections-per-host: 100
    peer-node-connection-idle-timeout-seconds: 30

在上面的示例中，我们定义了一个Eureka Server，它监听8761端口，并关闭了自我保护机制。同时，我们定义了一个Eureka集群，包括多个Eureka Server节点。

示例二：搭建Eureka Client集群

以下是搭建Eureka Client集群的示例：

server:
  port: 8080

spring:
  application:
    name: service-provider

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/

在上面的示例中，我们定义了一个Eureka Client，它监听8080端口，并注册到Eureka Server集群中。

总结

本攻略详细讲解了Spring Cloud Eureka搭建高可用集群的过程，包括搭建Eureka Server集群、搭建Eureka Client集群等内容，并提供了两个示例说明。通过本攻略的学习，读者可以了解Spring Cloud Eureka的基本情况，为实际开发提供参考。