SpringCloud config分布式配置中心

分布式系统面临的配置问题

springcloud听过的config可以完美的解决上述的问题，springcloud config是什么

 是什么

 怎么玩‘

 

 

 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

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

在自己的github创建一个仓库，并在本地下载

 这些前提条件搞好了之后创建cloud-config-center-3344服务端

 pom文件引入依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-config-center-3344</artifactId>

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

        <dependency>
            <groupId>org.example</groupId>
            <artifactId>cloud-api-conmmon</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <!--springcloud-config-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-eureka-client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <!--SpringBoot热部署配置 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>


</project>

　application.yml

server:
  port: 3344
spring:
  application:
    name: cloud-config-center
  cloud:
    config:
      server:
        git:
          uri: https://github.com/changtoufadeguniang/springcloud-config
          search-paths:
            - springcloud-config
      label: main
eureka:
  client:
    service-url:
      defaultZone:  http://localhost:7001/eureka

　　启动类

@SpringBootApplication
@EnableConfigServer
public class ConfigCenterApplicaton3344 {
    public static void main(String[] args) {
        SpringApplication.run(ConfigCenterApplicaton3344.class,args);
    }
}

　测试http://localhost:3344/main/application-dev.yml

Config客户端配置与测试  创建cloud-config-client-3355客户端

   pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-config-client-3355</artifactId>

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

        <dependency>
            <groupId>org.example</groupId>
            <artifactId>cloud-api-conmmon</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <!--springcloud-config-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-eureka-client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <!--SpringBoot热部署配置 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

　bootstrap.yml

server:
  port: 3355
spring:
  application:
    name: config-client
  cloud:
    config:
      label: main
      name: application
      profile: dev
      uri: http://localhost:3344
eureka:
  client:
    service-url:
      defaultZone:  http://localhost:7001/eureka

启动类

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

　　编写controller获取github application-dev.yml的内容

@RestController
@RequestMapping("/client")
public class ConfigClientController {


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

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

　　测试http://localhost:3355/client/getConfigInfo

发现问题，当github 上application-dev.yml的内容发生改变后，在不重启服务的情况下，服务端3344内容可以实时更新，但是3355获得的内容没有发生改变。只有重启3355客户端才会刷新改变

Config客户端之动态刷新

cloud-config-client-3355客户端

pom文件加入依赖

  <!--config客户端动态刷新需要引入的-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

　修改bootstrap.yml配置文件暴露端口

server:
  port: 3355
spring:
  application:
    name: config-client
  cloud:
    config:
      label: main
      name: application
      profile: dev
      uri: http://localhost:3344
eureka:
  client:
    service-url:
      defaultZone:  http://localhost:7001/eureka
#暴露端口
management:
  endpoints:
    web:
      exposure:
        include: "*"

　　controller添加注解@RefreshScope

@RestController
@RequestMapping("/client")
@RefreshScope
public class ConfigClientController {


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

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

　　一切搞好之后重启服务，然后修改github上配置文件的内容，在访问http://localhost:3355/client/getConfigInfo内容还是没有更新

这时需要先发送一次post请求，http://localhost:3355/actuator/refresh刷新一下服务

 再次请求

 内容已经发生了改变