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Introduction to Spring Cloud
The document provides an introduction to Spring Cloud, outlining its components, architecture, and the principles of cloud-native applications. It discusses essential concepts such as service discovery, configuration management, and failure mitigation approaches within distributed systems. The presentation also emphasizes the importance of the Spring ecosystem and the future of VMware's offerings in cloud technologies.
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Introduction to Spring Cloud
- 1. Introduction to Spring Cloud Slack:#session-introduction-to-spring-cloud Olga Maciaszek-Sharma @olga_maciaszek Spencer Gibb @spencerbgibb
- 2. Safe Harbor Statement Thefollowing is intended to outline the general direction of VMware's offerings. It is intended for information purposes only and may not be incorporated into any contract. Any information regarding pre-release of VMware offerings, future updates or other planned modifications is subject to ongoing evaluation by VMware and is subject to change. This information is provided without warranty or any kind, express or implied, and is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions regarding VMware's offerings. These purchasing decisions should only be based on features currently available. The development, release, and timing of any features or functionality described for VMware's offerings in this presentation remain at the sole discretion of VMware. VMware has no obligation to update forward looking information in this presentation.
- 3. Agenda • Cloud Native •Sample Architecture • Spring Cloud Components • Revisit Sample Architecture • Demo 3 
- 4. Cloud Native • Distributed •Scalable • Resilient • Automated • Organizational (Conway’s Law) • Replaceable 4 
- 5. Fallacies of DistributedComputing • The network is reliable. • Latency is zero. • Bandwidth is infinite. • The network is secure. • Topology doesn't change. • There is one administrator. • Transport cost is zero. • The network is homogeneous. https://web.archive.org/web/20071223073932/http://java.sys-con.com/read/38665.htm 5 
- 6. 12 Factor Appshttps://12factor.net 1.Code in VCS 2.Dependencies 3.Config in environment 4.Backing Services 5.Build, release, run 6.Process 6  7.Port binding 8.Concurrency 9.Disposability 10.Dev/prod parity 11.Logs 12.Admin processes See also the 1 Factor App and 15 Factor Apps
- 7. User Service Sample Architecture APIGateway Metrics Service Discovery Fraud Verifier Configuration Card Application Service
- 8.
- 9. Spring Cloud ConfigServer ● Pluggable ○ Git ○ Vault ○ Credhub ○ JDBC ○ IaaS resource (S3, etc…) ● Retry ● Spring Boot compatible client 9
- 10. Spring Cloud ConsulConfig ● Bring your own Consul ● Uses key-value store ● Can be on value per key or a file per key ● Can be auto-refreshed ● Spring Boot compatible client 1 0
- 11. Others ● Spring CloudVault ● Spring Cloud Zookeeper Config ● Direct to IaaS ○ Spring Cloud Alibaba ○ Spring Cloud AWS ○ Spring Cloud Azure ○ Spring Cloud GCP ● Platform ○ K8s config maps 1 1
- 12. Service A Service A Service Registration andDiscovery Service A Service Registry Service B 1. Registers 2. Query for Service A instances 3. Connect
- 13. Netflix Eureka ● Providedby Spring Cloud Netflix ● Highly Available ● Eventually Consistent ● Netflix uses Spring Cloud Netflix! http://techblog.netflix.com/2012/09/eureka.html 1 3
- 14. Consul by Hashicorp ●Integration by Spring Cloud Consul ● Bring your own Consul Servers ● Can be strongly consistent ● Uses Services API ● Supports consul health checks ● Spring Boot compatible client 1 4
- 15. Others ● Spring CloudZookeeper Discovery ● Spring Cloud Alibaba (Nacos) 1 5
- 16. Client Side Load-balancer Service A Service A Service A Service Registry Service B 1.Query service A instances 2. Select the service A instance to send the request to Service A Service A Service A
- 17. Spring Cloud LoadBalancer ●Replaces Netflix Ribbon ● Pluggable algorithm ● Reactive support ● Extensible configuration 1 7
- 18.
- 19. Spring Cloud CircuitBreaker ● Protects from cascading failures ● Fallback ● Pluggable ○ Resilience4j ○ Spring Retry ○ Spring Cloud Alibaba (Sentinel) ● Pluggable algorithm ● Reactive support 1 9 Open Closed Half Open Failure threshold exceeded Success Timeout Reset Failure
- 20. Retry ● Retry failedrequests ● Spring Retry ● Project Reactor ● Resilience4j 2 0
- 21.
- 22. Spring Cloud Sleuth ●Trouble-shooting across a distributed system ● Instruments for tracing ○ Spring Framework ○ Spring Boot ○ Spring Cloud 2 2
- 23.
- 24. Spring Cloud Gateway ●API Gateway ● Spring Boot App ● Focus on developer experience and customization ● Supports Spring Cloud ○ Configuration ○ Service Discovery ○ LoadBalancer ○ Retry/Circuit Breaker ○ Rate Limiting ○ Sleuth 2 4
- 25. User Service (SC Circuit Breaker) SampleArchitecture with Spring Cloud Spring Cloud Gateway (SC CircuitBreaker, Retry) Metrics Eureka Service Discovery Fraud Verifier Spring Cloud Config Server Card Application Service (SC LoadBalancer)
- 26.
- 27. What we didnot talk about.
- 28. More to SpringCloud ● Spring Cloud Bus ● Spring Cloud OpenFeign ● Spring Cloud Contract ● Spring Cloud Function ● Spring Cloud Stream ● Spring Cloud Task ● Spring Cloud Data Flow ● ... 2 8
- 29. Stay Connected. Slack: #session-introduction-to-spring-cloud https://github.com/spring-cloud-samples/spring-cloud-intro-demo https://github.com/spring-cloud https://spring.io/projects/spring-cloud OlgaMaciaszek-Sharma @olga_maciaszek Spencer Gibb @spencerbgibb #springone@s1p