spring-cloud-config.md

Read more about Spring Cloud Config

In a distributed system, Spring Cloud Config provides extensible configuration services through config-server and config-client, and uses the configuration service center to centrally manage the various environment profiles for all services. Spring Cloud Config supports three ways of storing Git (default), SVN, and File, based on the idea of using the central repository (version control).

Build Config Server

• Build mvn and name it config-server, core dependencies:

  <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-config-server</artifactId>
   </dependency> 
  

• Start the configuration server by adding @EnableConfigServer in the Application class of application entry

  @EnableConfigServer
  @SpringBootApplication
  public class Application {
   
      public static void main(String[] args) {
          new SpringApplicationBuilder(Application.class).web(true).run(args);
      }
  }       
  

• Configuration

  server:
    port: 8888
   
  spring:
    application:
      name: config-server
    cloud:
      config:
        server:
          git:
            uri:                        ## The git address stored in the configuration file
            searchPaths: config         
       
  

  Obtaining resource information on git follows the following rules:

  /{application}/{profile}[/{label}]
  /{application}-{profile}.yml
  /{label}/{application}-{profile}.yml
  /{application}-{profile}.properties
  /{label}/{application}-{profile}.properties  
  

Build Config client

• Build mvn and name it config-client, core dependencies:

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

• Start the configuration server by adding @EnableConfigServer in the Application class of application entry

  @SpringBootApplication
  public class Application {
   
      public static void main(String[] args) {
          new SpringApplicationBuilder(Application.class).web(true).run(args);
      }
  }        
  

• Create a restful interface to access configuration

  @EnableAutoConfiguration
  @RefreshScope
  @RestController
  public class DemoController {
   
      @Value("${from}")
      String from;
       
       
      @RequestMapping("/from")
      public String from() {
          return this.from;
      }
  }
  

• Configuration

  server:
    port: 9000
   
  spring:
    application:
      name: config-client
    profiles:
      active: dev
    cloud:
      config:
        uri: http://${CONFIG_HOST}:${CONFIG_PORT}
        label: master      
  

• Address

  http://DOCKER_HOST:DOCKER_PORT/from