The document provides an overview of cloud-native applications using Spring Boot and Spring Cloud, detailing key concepts such as microservices, elastic and resilient services. It discusses Spring Boot's features like auto-configuration and production readiness, as well as Spring Cloud's higher-level abstractions for configuration management and service discovery. Additionally, it covers practical implementations using components like Eureka for service registry, Hystrix for circuit breaking, and Zuul as a proxy.

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