Spring Cloud Demo on PCF - Walkthrough

Spring Cloud Meetup

Generate todo-service

start.spring.io

Web
Actuator
Rest Repositories
JPA
H2
MySQL
Config Client
Eureka Discovery
Lombok
Cloud Stream
RabbitMQ

Add to pom.xml:

		<finalName>app</finalName>

Generate a greeting

@RestController
@Slf4j
class BeerGreeting {
	@Autowired
	Environment env;
	
	@GetMapping("/greeting")
	String greeting(){
		log.info("Returning greeting from service...");
		return "Hello from your TODO App! I am service instance " + env.getProperty("CF_INSTANCE_INDEX");
	}
}

Build locally and run: mvn clean package mvn spring-boot:run

Build and push: mvn clean package -DskipTests && cf push -p target/app.jar todo-service

Externalize the configuration

@RestController
@RefreshScope
@Slf4j
class BeerGreeting {
	@Value("${greeting}")
	private String greeting;
	
	@GetMapping("/greeting")
	String greeting(){
		log.info("Returning greeting from service...");
		return greeting;
	}
}

Add to application.properties:

greeting=Greetings from your TODO app!

Test with mvn spring-boot:run

What's wrong with this implementation?

• Internal configuration
• Impossible to dynamically change config
• Every property change requires a rebuild

A Config Server can help here.

Create at start.spring.io

Add to main class: @EnableConfigServer

Add to application.properties:

spring.application.name=config-server
spring.cloud.config.server.git.uri=https://github.com/odedia/spring-cloud-meetup-config-repo.git
server.port=8888

In todo-service, rename application.properties to bootstrap.properties and add the following:

spring.application.name=todo-service
spring.cloud.config.uri=http://localhost:8888

This all works for local work, but what about PCF? Just create a service and provide the properties from above:

cf create-service p-config-server standard config-server -c '{"count": 2, "git": { "uri": "https://github.com/odedia/spring-cloud-meetup-config-repo.git" } }'

mvn clean package && cf push -p target/app.jar todo-service