SpringCloud 进阶之分布式配置中心(SpringCloud Config)

谁践踏了优雅 2022-10-02 06:55 234阅读 0赞

### 1. SpringCloud Config ###

*  SpringCLoud Config 为微服务架构中的微服务提供集中化的外部配置支持,配置服务器为各个不同微服务应用  
    的所有环境提供了一个中心化的外部配置;
 *  SpringCloud Config 分为服务端和客户端:
    
     *  服务端也称为分布式配置中心,它是一个独立的微服务应用,用来连接配置服务器并为客户端提供获取配置信息,  
        加密/解密信息等访问接口;
     *  客户端则是通过指定的配置中心来管理应用资源,以及与业务相关的配置内容,并在启动的时候从配置中心获取和  
        加载配置信息;
 *  配置服务器默认采用Git来存储配置信息;

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#### 1.1 SpringCloud Config服务端配置 ####

#### GitHub 准备工作 ####

// GitHub 新建一个名为 microservicecloudd-config 的新Repository
    // 获得SSH协议的git地址: git@github.com:Noodlescn/microservicecloud-config.git
    // 本地硬盘目录上,新建Git仓库,并clone
    git clone git@github.com:Noodlescn/microservicecloud-config.git
    
    // 本地Git仓库,microservicecloud-config 新建 application.yml
    spring:
        profiles:
            active:
            - dev
    ---
    spring:
        profiles: dev       # 开发环境
        application:
            name: microservicecloud-config-noodles-dev
    ---
    spring:
        profiles: test      # 测试环境
        application:
            name: microservicecloud-config-noodles-test
    
    # 文件保存为 UTF-8 格式
    
    // 将application.yml推送到github上

#### 新建 microservicecloud-config-3344(Cloud的配置中心模块) ####

// pom.xml
    
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-config-server</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.eclipse.jgit</groupId>
        <artifactId>org.eclipse.jgit</artifactId>
        <version>4.10.0.201712302008-r</version>
    </dependency>
    
    // application.yml
    server:
      port: 3344
    
    spring:
      application:
        name: microservicecloud-config
      cloud:
        config:
          server:
            git:
              uri: git@github.com:Noodlescn/microservicecloud-config.git # GitHub上面的git仓库名字
    
    // 主启动类
    @SpringBootApplication
    @EnableConfigServer
    public class Config_3344_StartSpringCloudApp {
    
        public static void main(String[] args) {
            SpringApplication.run(Config_3344_StartSpringCloudApp.class, args);
        }
    
    }
    
    // 修改hosts文件,增加映射
    // 127.0.0.1      config-3344.com
    
    // 测试启动微服务 3344
    // http://config-3344.com:3344/application-dev.yml
    // http://config-3344.com:3344/application-test.yml

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#### 1.2 SpringCloud Config客户端配置 ####

#### GitHub 准备工作 ####

// 本地 microservicecloud-config 路径下新建文件 microservicecloud-config-client.yml
    spring:
        profiles:
            active
            - dev
    
    ---
    server:
      port: 8201
    spring:
      profiles: dev
      application:
        name: microservicecloud-config-client
    eureka:
      client:
        service-url:
          defaultZone: http://eureka-dev.com:7001/eureka/
    ---
    server:
      port: 8202
    spring:
      profiles: test
      application:
        name: microservicecloud-config-client
    eureka:
      client:
        service-url:
          defaultZone: http://eureka-test.com:7001/eureka/
    
    // 提交到GitHub

#### 新建 microservicecloud-config-client-3355 ####

// pom.xml
    
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-config</artifactId>
    </dependency>
    
    // bootstrap.yml(是系统级配置文件,优先级最高)
    spring:
      cloud:
        config:
          name: microservicecloud-config-client # 需要从github上读取的资源名称,注意没有yml后缀名
          profile: dev  # 本次访问的配置项
          label: master
          uri: http://config-3344.com:3344  
          # 本微服务启动后,先去找3344号服务,通过SpringCloudConfig获取GitHub的服务地址
    
    // application.yml(是用户级的资源配置项)
    spring:
      application:
        name: microservicecloud-config-client
    
    // 修改hosts文件: 127.0.0.1  client-config.com
    
    // 新建rest类,验证是否能从GitHub上读取配置
    @RestController
    public class ConfigClientRest {
    
        @Value("${spring.application.name}$")
        private String applicationName;
    
        @Value("${eureka.client.service-url.defaultZone}$")
        private String eurekaServers;
    
        @Value("${server.port}$")
        private String port;
    
        @RequestMapping("/config")
        private String getConfig() {
            String str = "applicationName:"+applicationName+"\t eurekaServers:"+eurekaServers+"\t port:"+port;
            System.out.println("********str:" + str);
            return str;
        }
    }
    
    // 主启动类ConfigClient_3355_StartSpringCloudApp
    @SpringBootApplication
    public class ConfigClient_3355_StartSpringCloudApp {
    
        public static void main(String[] args) {
            SpringApplication.run(ConfigClient_3355_StartSpringCloudApp.class, args);
        }
    
    }
    
    // 测试访问:
    // http://client-config.com:8201/config

### 2. SpringCloud Config 配置实战 ###

#### GitHub 准备工作 ####

// 本地microservicecloud-config 下新建:
    // microservicecloud-config-eureka-client.yml
    spring:
      profiles:
        active:
        - dev
    ---
    server:
      port: 7001
    
    spring:
      profiles: dev
      application:
        name: microservicecloud-config-eureka-client
    
    eureka:
      instance:
        hostname: eureka7001.com
      client:
        register-with-eureka: false  # 当前的eureka-server自己不注册进服务列表中
        fetch-registry: false  # 不通过eureka获取注册信息
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/
    ---
    server:
      port: 7001    # 注册中心占用7001端口
    
    spring:
      profiles: test
      application:
        name: microservicecloud-config-eureka-client
    
    eureka:
      instance:
        hostname: eureka7001.com
      client:
        register-with-eureka: false  # 当前的eureka-server自己不注册进服务列表中
        fetch-registry: false  # 不通过eureka获取注册信息
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/
    
    // 本地microservicecloud-config 下新建:
    // microservicecloud-config-dept-client.yml
    spring:
      profiles:
        active:
        - dev
    ---
    server:
      port: 8001
    spring:
      profiles: dev
      application:
        name: microservicecloud-config-dept-client
      datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: org.gjt.mm.mysql.Driver
        url: jdbc:mysql://localhost:3306/cloudDB01
        username: root
        password: root
        dbcp2:
          min-idle: 5
          initial-size: 5
          max-total: 5
          max-wait-millis: 200
    mybatis:
        config-location: classpath:mybatis/mybatis.cfg.xml
        type-aliases-package: com.noodles.springcloud.entities
        mapper-locations:
        - classpath:mybatis/mapper/**/*.xml
    
    eureka:
      client:  # 客户端注册进eureka服务列表内
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka
      instance:
        instance-id: dept-8001.com
        prefer-ip-address: true
    
    info:
      app.name: noodles-microservicecloud-springcloudconfig01
      company.name: www.google.com
      build.artifactId: $project.artifactId$
      build.version: $project.version$
    ---
    server:
      port: 8001
    spring:
      profiles: test
      application:
        name: microservicecloud-config-dept-client
      datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: org.gjt.mm.mysql.Driver
        url: jdbc:mysql://localhost:3306/cloudDB02
        username: root
        password: root
        dbcp2:
          min-idle: 5
          initial-size: 5
          max-total: 5
          max-wait-millis: 200
    mybatis:
        config-location: classpath:mybatis/mybatis.cfg.xml
        type-aliases-package: com.noodles.springcloud.entities
        mapper-locations:
        - classpath:mybatis/mapper/**/*.xml
    
    eureka:
      client:  # 客户端注册进eureka服务列表内
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka
      instance:
        instance-id: dept-8001.com
        prefer-ip-address: true
    
    info:
      app.name: noodles-microservicecloud-springcloudconfig02
      company.name: www.google.com
      build.artifactId: $project.artifactId$
      build.version: $project.version$
    
    // 上传GitHub

#### 新建 microservicecloud-config-eureka-client-7001 工程 (Config版的eureka服务端) ####

// pom.xml(参照microservicecloud-eureka-7001)
    
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-config</artifactId>
    </dependency>
    
    // bootstrap.yml
    spring:
      cloud:
        config:
          name: microservicecloud-config-eureka-client  # 需要从GitHub上读取的资源名称,没有yml后缀名
          profile: dev
          label: master
          uri: http://config-3344.com:3344    # SpringCloudConfig 获取的服务地址
    
    // application.yml
    spring:
      application:
        name: microservicecloud-config-eureka-client
    
    // 主启动类
    @SpringBootApplication
    @EnableEurekaServer  // EurekaServer 服务器端启动类,接收其他微服务注册进来
    public class Config_Git_EurekaServerApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(Config_Git_EurekaServerApplication.class, args);
        }
    }
    
    //测试
    // 启动 microservicecloud-config-3344
    // 启动 microservicecloud-config-eureka-client-7001
    // 访问 http://eureka7001.com:7001/

#### 新建 microservicecloud-config-dept-client-8001(Config版的dept微服务) ####

// pom.xml(参照8001)
    
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-config</artifactId>
    </dependency>
    
    // bootstrap.yml
    spring:
      cloud:
        config:
          name: microservicecloud-config-dept-client  # 需要从GitHub上读取的资源名称
          # profile 配置什么就读取什么,配置 dev 或 test
          profile: test
          label: master
          uri: http://config-3344.com:3344  # SpringCloudConfig 获取的服务地址
    
    // application.yml
    spring:
      application:
        name: microservicecloud-config-dept-client
    
    // 主启动类
    @SpringBootApplication
    @EnableEurekaClient // 本服务启动后,自动注册进eureka服务中
    @EnableDiscoveryClient // 服务发现
    public class DeptProvider8001_App {
    
        public static void main(String[] args) {
            SpringApplication.run(DeptProvider8001_App.class, args);
        }
    }
    
    // 测试
    // 默认访问 test 配置: http://localhost:8001/dept/list
    // 更换 dev 配置: http://localhost:8001/dept/list

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[1240]: /images/20220113/48515f1e710549d1b709e50fa6e2c397.png
[1240 1]: /images/20220113/a3c97719d1324c0cb716858b248adcdc.png
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