Nowadays enterprises as well as startups are looking to build their software applications leveraging Cloud Platforms so that they can greatly reduce their go to market time and infrastructure setup costs. However, Cloud Native Applications (NCA) should be designed with cloud computing architecture in mind which involves thinking about dynamic provisioning of resources, service downtimes, data redundancy etc. Spring Boot provides a robust platform for building microservices and Spring Cloud provides the capabilities to build Cloud Native Applications by abstracting the low level details. In this talk, we will learn how to develop Cloud Native Applications using Spring Boot and Spring Cloud frameworks.

1. Cloud Native Applications
using
Spring Boot & Spring Cloud
K. Siva Prasad Reddy

2. Agenda
• What is Cloud Native Application?
• Introducing Spring Boot
• Why Spring Boot?
• Features of Spring Boot
• Introducing Spring Cloud
• Cloud Config: Centralized Configuration Server
• Service Registry using Eureka
• Circuit Breaker using Hystrix
• Zuul Proxy
• Monitoring using Hystrix Dashboard/Turbine

3. About me
• K. Siva Prasad Reddy
• Tech Lead at ThoughtWorks
• Blog: http://sivalabs.in
• Twitter: @sivalabs
• Author of following books

4. Cloud Native Applications
A cloud-native application is composed of multiple services and each
service is elastic, resilient, and composable.
• The Application is composed of multiple services
• Each service is elastic
• Each service is resilient
• Each service is composable

5. 12 Factor Applications(http://12factor.net)
Source: https://www.linkedin.com/pulse/missing-factor-12-apps-prashant-musale/

6. Source: https://twitter.com/wattersjames/status/664044293250641920

7. Spring Boot
• An opinionated approach to building Spring based applications
• Convention over Configuration
• Auto Configuration
• Production ready features via Actuator
• I want to integrate with XYZ – There is a starter for that 

8. Spring Cloud
Spring Cloud, builds on top of Spring Boot, provides higher level abstractions for
the implementation of various commonly used patterns in distributed systems.
• Configuration management
• Service discovery
• Circuit breakers
• Intelligent routing
• Micro-proxy
• OAuth security
• Distributed sessions etc

9. Spring Cloud Config
• Centralized Configuration Server
• No need to restart applications upon configuration changes
@SpringBootApplication
@EnableConfigServer
public class ConfigServerApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigServerApplication.class, args);
}
}
bootstrap.properties
spring.cloud.config.server.git.uri=https://github.com/siva/config-repo.git

10. Spring Cloud Config

11. Spring Cloud Service Registry & Discovery
• Sophisticated registration and de-registration of servers with load
balancer on the fly
@SpringBootApplication
@EnableEurekaServer
public class ServiceRegistryApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceRegistryApplication.class,
args);
}
}

13. Eureka Service Registry
http://localhost:8761/

14. Spring Cloud Service Discovery
@SpringBootApplication
@EnableEurekaClient
public class CatalogServiceApplication {
public static void main(String[] args) {
SpringApplication.run(CatalogServiceApplication.class, args);
}
}
bootstrap.properties
eureka.client.service-
url.defaultZone=http://localhost:8761/eureka/

15. Circuit Breaker Pattern using Hystrix
• A pattern to prevent service failure from cascading to other services
@EnableHystrix
@EnableEurekaClient
@SpringBootApplication
public class CatalogServiceApplication {
…
}
@Service
public class CatalogService {
@HystrixCommand(fallbackMethod = "getProductsFromCache")
public List<Product> getProducts() {
...
}
private List<Product> getProductsFromCache() {
...
}
}

16. Spring Cloud Zuul Proxy
• JVM based router and server side load balancer
• Can use for:
• Dynamic routing
• Security/Authentication
• Canary testing
• Avoid CORS concerns

17. Monitoring using Hystrix Dashboard/Turbine
• Shows health of each circuit breaker
• To monitor multiple applications use Turbine
@SpringBootApplication
@EnableHystrixDashboard
@EnableTurbine
public class CatalogServiceApplication {
public static void main(String[] args) {
SpringApplication.run(CatalogServiceApplication.class, args);
}
}

18. Hystrix Dashboard