SpringCloud config分布式配置中心

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SpringCloud config分布式配置中心

分布式系统面临的配置问题

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能干嘛？

集中管理配置文件

不同环境不同配置，动态化的配置更新，分环境部署比如dev/test/prod/beta/release

运行期间动态调整配置，不再需要在每个服务部署的机器上编写配置文件，服务会向配置中心统一拉取配置自己的信息

当配置发生变动时，服务不需要重启即可感知到配置的变化并应用新的配置

将配置信息以REST接口的形式暴露，post、curl访问刷新均可….

与Github整合配置

由于SpringCloud Config默认使用Git来存储配置文件（也有其它方式，比如支持svn和本地文件，但最推荐的还是Git，而且使用的是http/https访问的形式）

Config服务端配置与测试

1.用你自己的账号在Github上新建一个名为sprincloud-config的新Repository

2.由上一步获得刚新建的git地址，写你自己的仓库地址

3.本地硬盘上新建git仓库并clone，

本地地址：D:\44\SpringCloud2020

git命令 git clone xxx

4.此时在本地D盘符下D:\44\SpringCloud2020\springcloud-config

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表示多个环境的配置文件,保存格式必须为UTF-8,如果需要修改，

此处模拟运维人员操作git和github

git add

git commit -m “init yml”

git push origin master

5.新建Module模块cloud-config-center-3344它既为Cloud的配置中心模块cloudConfig Center

pom

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<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-config-server</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
    <dependency>
        <groupId>com.kayleh.springcloud</groupId>
        <artifactId>cloud-api-commons</artifactId>
        <version>${project.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

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

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

yml

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server:
  port: 3344
spring:
  application:
    name: cloud-config-center
  cloud:
    config:
      server:
        git:
#          uri: git@github.com:Kayleh/springcloud-config.git  #填写你自己的github路径
          uri: https://github.com/Kayleh/springcloud-config.git  #填写你自己的github路径
          search-paths:
            - springcloud-config
          username: Kayleh
          password: #密码
      label: master
eureka:
  client:
    service-url:
      defaultZone:  http://localhost:7001/eureka

主启动类: @EnableConfigServer

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package com.kayleh.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;

@SpringBootApplication
@EnableConfigServer
public class ConfigCenterMain3344 {
    public static void main(String[] args) {
            SpringApplication.run(ConfigCenterMain3344 .class,args);
        }
}

windows下修改hosts文件，增加映射

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127.0.0.1 config-3344.com

测试通过Config微服务是否可以从Github上获取配置内容

启动微服务3344

http://config-3344.com:3344/master/config-dev.yml

配置读取规则

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  • /{label}/{application}-{profile}.yml（最推荐使用这种方式）

    • master分支

      http://config-3344.com:3344/master/config-dev.yml

      http://config-3344.com:3344/master/config-test.yml

      http://config-3344.com:3344/master/config-prod.yml

    • dev分支

      http://config-3344.com:3344/dev/config-dev.yml

      http://config-3344.com:3344/dev/config-test.yml

      http://config-3344.com:3344/dev/config-prod.yml

  • /{application}-{profile}.yml

    • http://config-3344.com:3344/config-dev.yml
    • http://config-3344.com:3344/config-test.yml
    • http://config-3344.com:3344/config-prod.yml
    • http://config-3344.com:3344/config-xxxx.yml(不存在的配置)

  • /{application}-{profile}[/{label}]

    • http://config-3344.com:3344/config/dev/master
    • http://config-3344.com:3344/config/test/master
    • http://config-3344.com:3344/config/prod/master

重要配置细节总结

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成功实现了用SpringCloud Config 通过GitHub获取配置信息

Config客户端配置与测试

新建cloud-config-client-3355

pom

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<dependencies>

       <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-config</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
       </dependency>
       <dependency>
           <groupId>com.kayleh.springcloud</groupId>
           <artifactId>cloud-api-commons</artifactId>
           <version>${project.version}</version>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-web</artifactId>
       </dependency>

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

       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-devtools</artifactId>
           <scope>runtime</scope>
           <optional>true</optional>
       </dependency>

       <dependency>
           <groupId>org.projectlombok</groupId>
           <artifactId>lombok</artifactId>
           <optional>true</optional>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-test</artifactId>
           <scope>test</scope>
       </dependency>
   </dependencies>

bootstap.yml

是什么?

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server:
  port: 3355

spring:
  application:
    name: config-client
  cloud:
    config:
      label: master
      name: config
      profile: dev
      uri: http://localhost:3344
eureka:
  client:
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka

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修改config-dev.yml配置并提交到GitHub中，比如加个变量age或者版本号version

主启动类:

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package com.kayleh.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ConfigClientMain3355 {
    public static void main(String[] args) {
            SpringApplication.run( ConfigClientMain3355.class,args);
        }
}

业务类

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package com.kayleh.springcloud.Controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ConfigClientController {

    @Value("${config.info}")
    private String configInfo;

    @GetMapping("/configInfo")
    public String getConfigInfo(){
        return configInfo;
    }
}

启动Config配置中心3344微服务并自测

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http://config-3344.com:3344/master/config-dev.yml
http://config-3344.com:3344/master/config-test.yml

启动3355作为Client准备访问

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http://localhost:3355/configInfo

成功实现了客户端3355访问SpringCloud Config3344通过GitHub获取配置信息

问题随时而来，分布式配置的动态刷新

Linux运维修改GitHub上的配置文件内容做调整

刷新3344，发现ConfigServer配置中心立刻响应

刷新3355，发现ConfigServer客户端没有任何响应

3355没有变化除非自己重启或者重新加载

难道每次运维修改配置文件，客户端都需要重启？？噩梦

Config客户端之动态刷新

避免每次更新配置都要重启客户端微服务3355

修改3355模块

POM引入actuator监控

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

修改YML，暴露监控端口

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server:
  port: 3355

spring:
  application:
    name: config-client
  cloud:
    config:
      label: master
      name: config
      profile: dev
      uri: http://localhost:3344
eureka:
  client:
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka

management:
  endpoints:
    web:
      exposure:
        include: "*"

@RefreshScope业务类Controller修改

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package com.kayleh.springcloud.Controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RefreshScope
@RestController
public class ConfigClientController {

    @Value("${config.info}")
    private String configInfo;

    @GetMapping("/configInfo")
    public String getConfigInfo(){
        return configInfo;
    }
}

此时修改去github

测试3344 和3355

http://config-3344.com:3344/master/config-dev.yml

http://localhost:3355/configInfo

3355没有改变，(只有重启才有效果）

需要运维人员发送Post请求刷新3355,必须是Post请求

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curl -X POST "http://localhost:3355/actuator/refresh"

再次http://localhost:3355/configInfo

成功实现了客户端3355刷新到最新配置内容,避免了服务的重启

想想还有什么问题？

假如有多个微服务客户端3355/3366/3377。。。。

每个微服务都要执行一次post请求，手动刷新？

可否广播，一次通知，处处生效？

我们想大范围的自动刷新，求方法