Spring Cloud学习:06高可用分布式配置中心(Config Cluster)

Java框架

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2020-6-1

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配置中心从远程git仓库读取配置信息,配置客户端从配置中心读取信息,当服务实例数变多时,有必要进行集群部署,将配置中心也作为一个微服务,注册到服务注册中心,从而达到高可用的目的。

1 创建注册中心(Eureka Server)

1.1基于之前工程,创建新模块eureka-server,用作服务注册中心,选择Spring Initializr->Cloud Discovery-> Eureka Server,并添加以下依赖:

<dependencies>
   <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-eureka-server</artifactId>
   </dependency>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
   </dependency>
</dependencies>

1.2 添加服务注册中心配置:

server:
  port: 8889

eureka:
    instance:
      hostname: localhost
    client:
      register-with-eureka: false # 是否注册到eureka
      fetch-registry: false # 是否从eureka获取注册信息
      serviceUrl:
          # eureka服务器地址(注意:地址最后面的 /eureka/ 是固定值)
          defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

1.3 启动类添加@EnableEurekaServer注解

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }
}

2 改造配置中心(Config Server)

2.1 修改config-server模块,pom文件添加spring-cloud-starter-eureka依赖:

<dependencies>
   <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-config-server</artifactId>
   </dependency>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
   </dependency>
   <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-eureka</artifactId>
   </dependency>
</dependencies>

2.2 配置文件添加服务注册中心地址:http://localhost:8889/eureka/

server:
    port: 8888

spring:
    application:
      name: config-server
    # 配置中心
    cloud:
      config:
        server:
          git:
            uri: https://github.com/laravelshao/spring-cloud-config-repo # cloud配置仓库地址
            search-paths: spring-cloud-learning # 配置仓库路径
            username: # 公开仓库可不填写
            password: # 公开仓库可不填写
        label: master # 配置仓库分支

eureka:
    client:
      service-url:
        defaultZone: http://localhost:8889/eureka/ # 配置eureka服务器地址

2.3 启动类添加@EnableEurekaClient注解

@SpringBootApplication
@EnableConfigServer
@EnableEurekaClient
public class ConfigServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConfigServerApplication.class, args);
    }
}

3 改造配置客户端(Config Client)

3.1 修改config-client模块,pom文件添加spring-cloud-starter-eureka依赖:

<dependencies>
   <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-config</artifactId>
   </dependency>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
   </dependency>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-eureka</artifactId>
   </dependency>
</dependencies>

3.2 配置文件bootstrap.yml中添加以下配置:

  • spring.cloud.config.discovery.enabled:配置是否从配置中心读取文件
  • spring.cloud.config.discovery.serviceId:配置中心服务id
  • eureka.client.serviceUrl.defaultZone:配置eureka服务器地址
server:
    port: 8881

spring:
    application:
      name: config-client
    cloud:
      config:
        uri: http://localhost:8888/ # 配置服务中心地址
        label: master # 远程仓库分支
        profile: dev # 指定环境
        discovery:
          enabled: true # 从配置中心读取文件
          service-id: config-server # 配置中心服务id
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8889/eureka/ # 配置eureka服务器地址

3.3 依次启动eureka-server、config-server、config-client模块,访问http://localhost:8889/

访问http://localhost:8881/hi,结果:

说明从配置中心获取到配置数据。

本文源码下载地址:

https://github.com/laravelshao/spring-cloud-learning/tree/master/setion06-config-cluster

4 参考资料

Spring Cloud Config

史上最简单的SpringCloud教程

作者:寒武没有纪