Microservice With Spring Boot and Spring Cloud
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Spring Boot and Spring Cloud are an ideal foundation for creating Microservices based on Java. This presentation explains basic concepts of these libraries.
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Microservice With Spring Boot and Spring Cloud
- 1. Microservices with Spring Boot & Spring Cloud Eberhard Wolff Freelancer / Trainer
- 3. Eberhard Wolff - @ewolff Micro Services: Definition • Small • Independent deployment units • i.e. processes or VMs • Any technology • Any infrastructure • Include GUI Micro Service Server Micro Service Server
- 4. Eberhard Wolff - @ewolff Components Collaborate Micro Service Micro Service Link Data Replication REST Messaging
- 5. Eberhard Wolff - @ewolff Infrastructure for Microservices • Lots of services • Need infrastructure Easy to create a new project REST integrated Messaging supported Uniform operations
- 7. Eberhard Wolff - @ewolff Easy to Create New Project • One pom.xml • …Gradle / Ant • Very few dependencies • One plug in • Versions defined for you
- 8. Eberhard Wolff - @ewolff REST Integrated • Support in Spring MVC • As we have seen • Also support for JAX-RS • Jersey
- 9. Eberhard Wolff - @ewolff Messaging Support • Numerous Spring Boot Starter • AMQP (RabbitMQ) • HornetQ (JMS) • ActiveMQ (JMS, no starter)
- 10. Eberhard Wolff - @ewolff Messaging Support • Spring JMS abstraction • Message driven POJOs • Scalable • Simplify sending JMS • Can use other libs, too! • Boot can do everything plain Spring / Java can do
- 11. Eberhard Wolff - @ewolff Infrastructure for Microservices • More services • Need infrastructure Easy to create a new project REST integrated Messaging supported Simple deployment Uniform operations ✓ ✓ ✓
- 13. Eberhard Wolff - @ewolff Deploy • Just package everything in an executable JAR • …or a WAR • Based on Maven, Ant or Gradle • Build in configuration (YAML, properties etc.)
- 14. Eberhard Wolff - @ewolff Deploy • Install a basic machine • Install Java • Copy over .jar • Optional: Create application.properties
- 15. Eberhard Wolff - @ewolff Infrastructure for Microservices • More services • Need infrastructure Easy to create a new project REST integrated Messaging supported Simple deployment Uniform operations ✓ ✓ ✓ ✓
- 16. Eberhard Wolff - @ewolff Spring Boot Actuator • Provide information about the application • Via http / JSON • Can be evaluated by monitoring tools etc. • Another alternative approach to monitoring
- 18. Eberhard Wolff - @ewolff Infrastructure for Microservices • More services • Need infrastructure Easy to create a new project REST integrated Messaging supported Simple deployment Uniform operations ✓ ✓ ✓ ✓ ✓
- 19. Eberhard Wolff - @ewolff Deploy • Just package everything in an executable JAR
- 20. Eberhard Wolff - @ewolff Deploy • Just package everything in an executable JAR • …or a WAR
- 21. Eberhard Wolff - @ewolff Spring Cloud
- 22. Eberhard Wolff - @ewolff Based on Spring Boot
- 23. Eberhard Wolff - @ewolff Spring Cloud • Spring support for Amazon Web Services • Connector for Heroku PaaS • …and Cloud Foundry PaaS • The rest of Spring Cloud is for Microservices
- 24. Eberhard Wolff - @ewolff Coordinating Microservices
- 25. Eberhard Wolff - @ewolff Microservice Microservice Must find each other
- 26. Eberhard Wolff - @ewolff Service Discovery Eureka
- 27. Eberhard Wolff - @ewolff Why Eureka? • REST based service registry • Supports replication • Caches on the client • Resilient • Fast • …but not consistent • Foundation for other services
- 28. Eberhard Wolff - @ewolff Eureka Client in Spring Cloud • @EnableDiscoveryClient: generic • @EnableEurekaClient: more specific • Dependency to spring-cloud-starter-eureka • Automatically registers application
- 29. Eberhard Wolff - @ewolff application.properties eureka.client.serviceUrl.defaultZone=http://host: 8761/eureka/< eureka.instance.leaseRenewalIntervalInSeconds=5< spring.application.name=catalog< eureka.instance.metadataMap.instanceId=$ {spring.application.name}:${random.value}< eureka.instance.preferIpAddress=true< Eureka server Can include user / password Need unique ID Load balancing Faster updates Docker won’t resolve host names Used for registration In CAPITAL caps
- 30. Eberhard Wolff - @ewolff Eureka Server @EnableEurekaServer< @EnableAutoConfiguration< public'class'EurekaApplication'{' < <public'static'void'main(String[]'args)'{' <<SpringApplication.run(EurekaApplication.class,'args);' <}< < }< Add dependency to spring-cloud-starter-eureka-server
- 31. Eberhard Wolff - @ewolff
- 32. Eberhard Wolff - @ewolff Eureka Demo
- 33. Eberhard Wolff - @ewolff Microservice Microservice Must find each other Route calls to a service
- 34. Eberhard Wolff - @ewolff Zuul Routing
- 35. Eberhard Wolff - @ewolff Routing • One URL to the outside • Internal: Many Microservices • REST • Or HTML GUI
- 36. Eberhard Wolff - @ewolff Customer Order Catalog Zuul Proxy Automatically maps route to server registered on Eureka i.e. /customer/** to CUSTOMER No configuration Can add filters etc
- 37. Eberhard Wolff - @ewolff Zuul Proxy @SpringBootApplication @EnableZuulProxy public class ZuulApplication { public static void main(String[] args) { new SpringApplicationBuilder(ZuulApplication.class). web(true).run(args); } } Enable Zuul Proxy Can change route Also routing to external services possible
- 38. Eberhard Wolff - @ewolff lokaler Rechner Vagrant VM eureka zuul customer -app catalog- app order-app 172.17.0.0/16 Netzwerk 8761 8761 8080 8080 18761 18080
- 39. Eberhard Wolff - @ewolff Zuul Demo
- 40. Eberhard Wolff - @ewolff Microservice Microservice Must find each other Configuration Route calls to a service
- 41. Eberhard Wolff - @ewolff Configuration • Spring Cloud Config • Central configuration • Dynamic updates • Can use git backend • I prefer immutable server • & DevOps tools (Docher, Chef…)
- 42. Eberhard Wolff - @ewolff Microservice Microservice Must find each other Configuration Route calls to a service Communication
- 43. Eberhard Wolff - @ewolff Spring Cloud Bus
- 44. Eberhard Wolff - @ewolff Spring Cloud Bus • Pushed config updates • …or individual message • I prefer a messaging solution • Independent from Spring
- 45. Eberhard Wolff - @ewolff Microservice Microservice Must find each other Configuration Route calls to a service Communication Security
- 46. Eberhard Wolff - @ewolff Spring Cloud Security
- 47. Eberhard Wolff - @ewolff Spring Cloud Security • Single Sign On via OAuth2 • Forward token e.g. via RestTemplate • Support for Zuul • Very valuable!
- 48. Eberhard Wolff - @ewolff Implementing Microservices
- 49. Eberhard Wolff - @ewolff Microservice Microservice Load Balancing
- 50. Eberhard Wolff - @ewolff Load Balancing Ribbon
- 51. Eberhard Wolff - @ewolff Ribbon: Client Side Load Balancing • Decentralized Load Balancing • No bottle neck • Resilient • Hard to consider metrics / health • Data might be inconsistent Load Balancer Server Client
- 52. Eberhard Wolff - @ewolff RestTemplate & Load Balancing @RibbonClient(name = "ribbonApp") … public class RibbonApp { @Autowired private RestTemplate restTemplate; public void callMicroService() { Store store = restTemplate. getForObject("http://stores/store/1", Store.class); } } Enable Ribbon Left out other annotations Eureka name or server list Standard Spring REST client Can also use Ribbon API
- 53. Eberhard Wolff - @ewolff Microservice Microservice Load Balancing Resilience
- 54. Eberhard Wolff - @ewolff Hystrix Resilience
- 55. Eberhard Wolff - @ewolff Hystrix • Enable resilient applications • Do call in other thread pool • Won’t block request handler • Can implement timeout
- 56. Eberhard Wolff - @ewolff Hystrix • Circuit Breaker • If call system fail open • If open do not forward call • Forward calls after a time window • System won’t be swamped with requests
- 57. Eberhard Wolff - @ewolff Hystrix / Spring Cloud • Annotation based approach • Java Proxies automatically created • Annotations of javanica libraries • Simplifies Hystrix dramatically • No commands etc
- 58. Eberhard Wolff - @ewolff @HystrixCommand(fallbackMethod = "getItemsCache") public Collection<Item> findAll() { … this.itemsCache = pagedResources.getContent(); return itemsCache; } private Collection<Item> getItemsCache() { return itemsCache; }< Fallback
- 59. Eberhard Wolff - @ewolff lokaler Rechner Vagrant VM eureka zuul customer -app catalog- app order-app 172.17.0.0/16 Netzwerk 8761 8761 8080 8080 18761 18080
- 60. Eberhard Wolff - @ewolff lokaler Rechner Vagrant VM eureka zuul customer -app catalog- app turbine order-app 172.17.0.0/16 Netzwerk 8761 8761 8989 8989 8080 8080 18761 18989 18080
- 61. Eberhard Wolff - @ewolff Hystrix Dashboard Stream via http Circuit Breaker status Thread Pool status
- 62. Eberhard Wolff - @ewolff Conclusion
- 63. Eberhard Wolff - @ewolff Spring Boot for Microservices Easy to create a new project REST integrated Messaging supported Simple deployment Uniform operations ✓ ✓ ✓ ✓ ✓
- 64. Eberhard Wolff - @ewolff Hystrix Demo
- 65. Eberhard Wolff - @ewolff Must find each other: Service Discovery Configuration Route calls to a service Communication Load Balancing Resilience Spring Cloud for Microservices
- 66. Eberhard Wolff - @ewolff Links http://projects.spring.io/spring-boot/ http://projects.spring.io/spring-cloud https://github.com/ewolff/spring-boot-demos https://github.com/ewolff/microservices https://spring.io/guides/
- 67. Eberhard Wolff - @ewolff Thank You!!