Cloud Native Microservices with Spring Cloud
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In this talk we are going to discuss some of the key components of Spring Cloud. This includes the Netflix OSS integrations for Spring Boot apps which include Service Discovery (Eureka), Circuit Breaker (Hystrix), Intelligent Routing (Zuul) and Client Side Load Balancing (Ribbon). We will also touch on the Spring Cloud centralised configuration server and deploy these apps to Cloud Foundry.
![SPRING CLOUD
RESOURCE FORMAT
/{application}/{profile}[/{label}]
/{application}-{profile}.yml
/{label}/{application}-{profile}.yml
/{application}-{profile}.properties
/{label}/{application}-{profile}.properties
(label: master by default)](https://image.slidesharecdn.com/springcloudcf-160621102911/85/Cloud-Native-Microservices-with-Spring-Cloud-19-320.jpg)
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Cloud Native Microservices with Spring Cloud
- 1. CLOUD NATIVE MICROSERVICES WITH SPRING CLOUD CONOR SVENSSON
- 4. SPRING BOOT SPRING BOOT ▸ Stand-alone Spring-based applications ▸ Tomcat embedded container (supports Jetty & JBoss Undertow too) ▸ Starter POMs ▸ Annotation driven ▸ Java Configuration Beans
- 5. SPRING BOOT
- 7. SPRING BOOT DEPLOYMENT ▸ Self contained jar ▸ Web application archive ▸ Build targets ▸ $ mvn spring-boot:run ▸ $ gradle bootRun
- 8. SPRING BOOT TESTING ▸ spring-boot-starter-test starter POM provides: ▸ Spring Test ▸ Unit ▸ Hamcrest + Assert4J (v1.4) ▸ Mockito ▸ MockMvc ▸ @WebIntegrationTest
- 10. ACME HOME LOANS
- 11. ACME HOME LOANS LOAN APPLICATION EXTERNAL CREDIT SERVICE WEBSITE SERVICE SUBMISSION SERVICE 1 2 3
- 13. SPRING CLOUD SPRING CLOUD ▸ Microservice friendly components ▸ Distributed & versioned configuration ▸ Service discovery ▸ Dynamic routing ▸ Circuit breakers ▸ Distributed messaging ▸ Getting started:
- 14. SPRING CLOUD SPRING CLOUD ▸ Config ▸ Netflix ▸ Bus ▸ Cloud Foundry ▸ Cluster ▸ Consul ▸ Security ▸ Sleuth ▸ Data Flow ▸ Stream ▸ Modules ▸ Task ▸ Zookeeper ▸ AWS ▸ Connectors ▸ CLI
- 15. SPRING CLOUD CONFIG SERVER ▸ Git hosted configuration repository ▸ SVN & filesystem also supported (see implementations of org.springframework.cloud.config.server.EnvironmentR epository) ▸ Multiple security options w/Spring Security (HTTP Basic -> OAuth bearer tokens) ▸ Push updates via Spring Cloud Bus
- 17. SPRING CLOUD CONFIG SERVER CONFIGURATION application.yml:
- 18. SPRING CLOUD CLIENT CONFIGURATION FILE website.yml:
- 21. SPRING CLOUD SHARED RESOURCES ▸ Place in application.yml in root of configuration repo ▸ Profile specific configuration always takes precedence over shared ▸ E.g. Eureka server (more on this shortly)
- 23. SPRING CLOUD CLIENT PROFILES ▸ Annotate classes to associate with a profile ▸ @Profile(“…”) ▸ Configuration (bootstrap/application properties) ▸ spring.profiles.active = … ▸ Command line ▸ -Dspring.profiles.active=… ▸ Environment variable ▸ SPRING_PROFILES_ACTIVE=…
- 24. SPRING CLOUD RESOLVED CLIENT CONFIGURATION
- 25. SPRING CLOUD CONFIG SERVER GOTCHAS ▸ Client’s don’t fail on Config Server failure - boot with defaults (e.g. port 8080) ▸ To enable use spring.cloud.config.failFast=true ▸ Enable retries: ▸ Add spring-retry and spring-boot-starter-aop ▸ spring.cloud.config.retry.
- 27. NETFLIX OSS + SPRING SPRING CLOUD NETFLIX ▸ Service discovery (Eureka) ▸ Client side load balancing (Ribbon) ▸ Dynamic routing (Zuul) ▸ Circuit breaker (Hystrix) ▸ + a few others…
- 28. NETFLIX OSS + SPRING EUREKA ▸ Service discovery client & server ▸ Maintains registry of clients with metadata ▸ Host/port ▸ Health indicator URL ▸ Client heartbeats (30 sec default - changing not encouraged) ▸ Lease renewed with server ▸ Service available when client & server(s) metadata cache all in sync ▸ Can take up to 3 heart beats
- 29. NETFLIX OSS + SPRING EUREKA SERVER
- 30. NETFLIX OSS + SPRING EUREKA SERVER DASHBOARD
- 31. NETFLIX OSS + SPRING EUREKA CLIENT SETUP @EnableEurekaClient annotation application.yml in Config Server repo
- 32. NETFLIX OSS + SPRING RIBBON ▸ Client side loan balancer ▸ Can delegate to Eureka for server lists ▸ Or list servers ▸ stores.ribbon.listOfServers=… + ribbon.eureka.enabled=false
- 33. NETFLIX OSS + SPRING RIBBON USAGE ▸ Via RestTemplate ▸ No different to normal usage - Spring Cloud Commons abstraction ▸ Qualifier’s required if using regular & Ribbon enabled RestTemplate
- 34. NETFLIX OSS + SPRING ZUUL ▸ JVM based router & load balancer ▸ Provides single point of entry to services ▸ Including single point of authentication ▸ By default creates route for every service in Eureka ▸ Refer to http://localhost/credit-service routes to http://credit- service ▸ Filters provide limited entry points to system
- 35. NETFLIX OSS + SPRING ZUUL SERVER CREATION ‣ Include dependency spring-cloud-starter-zuul ‣ @EnableZuulProxy application annotation ‣ E.g. Allow access only to credit-service
- 36. NETFLIX OSS + SPRING SIDECAR ▸ Non-JVM access to components via Zuul proxy ▸ Setup Spring Boot application with @EnableSidecar ▸ Configure for your service: ▸ sidecar.port=… + sidecar.health-ui=… ▸ Access all services by Zuul URL (Sidecar running on port 80) ▸ http://localhost/config-server
- 37. NETFLIX OSS + SPRING HYSTRIX ▸ Circuit breaker ▸ Threshold breached (20 failures in 5 seconds) => breaker kicks in ▸ Default timeout threshold 1 second ▸ Per dependency thread pools ▸ Async command support (not Spring @Async) ▸ Sync or async fallback
- 38. NETFLIX OSS + SPRING HYSTRIX CLIENT ▸ @EnableCircuitBreaker application annotation ▸ @HystrixCommand on applicable methods
- 39. NETFLIX OSS + SPRING
- 40. NETFLIX OSS + SPRING HYSTRIX STREAM - PRE-REQUESTS
- 41. NETFLIX OSS + SPRING HYSTRIX STREAM - POST-REQUESTS
- 42. NETFLIX OSS + SPRING HYSTRIX DASHBOARD
- 43. NETFLIX OSS + SPRING HYSTRIX STREAM
- 44. NETFLIX OSS + SPRING HYSTRIX DASHBOARD
- 45. NETFLIX OSS + SPRING TURBINE - AGGREGATE MULTIPLE HYSTRIX CLIENTS
- 46. NETFLIX OSS + SPRING MONITORING ▸ Add dependency spring-boot-actuator ▸ Makes available various application metrics via /metrics endpoint ▸ Integration also available with DropWizard metrics (add dependency) ▸ Spring Cloud ▸ Spectator (supersedes Servo) - metrics collection ▸ Atlas - metrics backend
- 47. NETFLIX OSS + SPRING
- 49. CLOUD FOUNDRY CLOUD FOUNDRY ▸ Cloud Foundry ▸ PAAS ▸ Supports multiple languages & frameworks ▸ Manages VM containers for deployments within a “space” ▸ Multiple spaces for different environments ▸ Command-line tool (cf)
- 50. CLOUD FOUNDRY SPRING CLOUD FOUNDRY + CONNECTORS ▸ Spring Cloud Foundry ▸ Binding of CF single sign on to your services ▸ Integration with CF Service Discovery ▸ Spring Cloud Connectors ▸ Connectors for Spring Cloud on CF ▸ Config Server ▸ Eureka (Service Discovery) ▸ Hystrix (Circuit Breaker)
- 51. CLOUD FOUNDRY CLOUD FOUNDRY DEPLOYMENT ▸ Signup to preferred CF platform
- 52. CLOUD FOUNDRY CLOUD FOUNDRY DEPLOYMENT ▸ Create Spring Cloud components in CF provider ▸ Config Server ▸ Eureka (Service Discovery) ▸ Hystrix (Circuit Breaker) ▸ Update client applications ▸ CF provider client libraries (see https://docs.pivotal.io/spring-cloud- services/index.html) ▸ Deploy ▸ cf push AcmeWebsite -p website/target/website-0-SNAPSHOT.jar
- 53. ACME HOME LOANS
- 54. NETFLIX OSS + SPRING THANKS conor@huffle.com.au
- 55. NETFLIX OSS + SPRING RESOURCES ▸ Spring Cloud documentation - http://projects.spring.io/spring-cloud/spring-cloud.html ▸ Spring Boot sample projects - https://github.com/spring-projects/spring-boot/tree/master/spring-boot- samples ▸ Spring Cloud sample projects - https://github.com/spring-cloud-samples ▸ Hystrix annotations - https://github.com/Netflix/Hystrix/tree/master/hystrix-contrib/hystrix-javanica ▸ Useful demonstration of Spring Cloud usage - http://callistaenterprise.se/blogg/teknik/2015/05/20/ blog-series-building-microservices/ ▸ Creation of Spring Cloud Components on Pivotal Web Services https://docs.pivotal.io/spring-cloud- services/index.html ▸ Code to accompany this talk - https://github.com/conor10/homeloans ▸ https://www.huffle.com.au ▸ Ether Mining 101, SydEthereum Meetup @Tyro Fintech Hub, Thursday 30th June - http://bit.ly/ 28KdbgW