Standup Config Server

Click here to expand...

Dependencies

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

Application code

@EnableConfigServer
@SpringBootApplication
public class ConfigurationServiceApplication {

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

Config Repository Setup (Filesystem)

• On the file system, create a new directory and run git init in it
• Create a new file a-bootiful-client.properties and add the following

• message = This is from config server
  

Tell Config Server Where the Config Repository Is

server.port=8888
spring.cloud.config.server.git.uri=${HOME}/Desktop/config

Standup Config Client

Click here to expand...

Dependencies

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

App Code

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

@RefreshScope
@RestController
class DefaultController {

    @Value("${message:Hello default}")
    private String message;

    @RequestMapping("/message")
    String getMessage() {
        return this.message;
    }
}

App Properties

spring.application.name=a-bootiful-client
spring.config.import=optional:configserver:http://localhost:8888/

# to enable the /refresh endpoint, to demonstrate dynamic configuration changes
management.endpoints.web.exposure.include=*

Test Dynamic Config Changes

Click here to expand...

• check message: http://localhost:8080/message
• change message property in a-bootiful-client.properties and commit
• verify config-server picked up changes http://localhost:8888/a-bootiful-client/default
• refresh config-client via hitting POST endpoint:
  • curl localhost:8080/actuator/refresh -d {}-H “Content-Type: application/json”
• check updated message: http://localhost:8080/message