Cloud Native with Spring Boot and Kubernetes

The Spring ecosystem provides you with all you need to build cloud native applications, focusing on productivity, simplicity and speed. It’s ready to leverage cloud environment features and integrates with Kubernetes natively.

In this session, Thomas will cover common patterns and best practices to build cloud native applications using Reactive Spring, which provides better performance, resilience, and efficiency. You’ll then see how to containerize them, configure them through the natively supported ConfigMaps and Secrets, and deploy them to a Kubernetes cluster. Finally, he’ll show how to use Spring Native to build GraalVM native executables.

Transcript

1. Thomas Vitale
   GOTO Copenhagen
   Nov 10th, 2021
   Cloud Native with
   Spring Boot and Kubernetes
   From development to production
   @vitalethomas
   

   View Slide

2. Thomas Vitale
   • Senior Software Engineer at
   Systematic, Denmark.
   
   • Author of “Cloud Native Spring
   in Action” (Manning).
   
   • Spring Security and Spring
   Cloud contributor.
   About Me
   thomasvitale.com
   

   View Slide

3. Cloud Native
   thomasvitale.com @vitalethomas
   

   View Slide

4. Why Cloud Native?
   Speed
   Faster and
   fl
   exible delivery
   Cost
   
   
   Ef
   fi
   ciency and cost optimisation
   Scale
   Elasticity and dynamic scaling
   Resilience
   Availability and stability
   thomasvitale.com @vitalethomas
   

   View Slide

5. The Three P’s of Cloud Native Applications
   Properties
   Place Practices
   Private Cloud
   
   
   Public Cloud
   
   
   Hybrid Cloud
   Scalability
   
   
   Loose Coupling
   
   
   Resilience
   
   
   Manageability
   
   
   Observability
   
   
   Security
   Automation
   
   
   Continuous Delivery
   
   
   DevOps
   thomasvitale.com @vitalethomas
   

   View Slide

6. From Development to Production
   Cloud native journey in less than 45 minutes
   thomasvitale.com @vitalethomas
   Spring Boot
   Development
   Cloud Native
   Buildpacks
   Containerization
   Kubernetes
   Deployment
   

   View Slide

7. Cloud Native Development
   thomasvitale.com @vitalethomas
   

   View Slide

8. Cloud Native Development
   Development principles with Spring Boot
   • Self-contained application
   • Embedded server
   
   • No external dependencies
   
   • JAR packaging (“uber-JAR”)
   
   • Externalized con
   fi
   guration
   • Property
   fi
   les for default values
   
   • JVM system variables
   
   • Environment variables
   thomasvitale.com @vitalethomas
   

   View Slide

9. Packaging Spring Boot
   Standalone JAR
   thomasvitale.com @vitalethomas
   JAR
   Gradle
   
   
   bootJar
   Maven
   
   
   spring-boot:repackage
   

   View Slide

10. Containerization
    thomasvitale.com @vitalethomas
    

    View Slide

11. 1 Don’t use fat JARs
    2 Optimize build/runtime performance
    3 Don’t run as root or include secrets
    thomasvitale.com @vitalethomas
    

    View Slide

12. Containerize Java Applications
    Docker
    fi
    les
    Cloud Native Buildpacks
    Jib
    thomasvitale.com @vitalethomas
    

    View Slide

13. buildpacks.io
    

    View Slide

14. paketo.io
    

    View Slide

15. Packaging Spring Boot
    JAR & Container Image
    thomasvitale.com @vitalethomas
    JAR
    Container Image
    Gradle
    
    
    bootJar
    Maven
    
    
    spring-boot:repackage
    Gradle
    
    
    bootBuildImage
    Maven
    
    
    spring-boot:build-image
    

    View Slide

16. Spring Boot on Kubernetes
    thomasvitale.com @vitalethomas
    

    View Slide

17. tanzucommunityedition.io
    

    View Slide

18. knative.dev
    

    View Slide

19. Configuring Resources
    CPU & Memory
    thomasvitale.com @vitalethomas
    CPU
    Memory
    When limit hit
    
    
    Throttle
    Compressible
    
    
    Resource
    When limit hit
    
    
    OOMKilled
    Non
    
    
    Compressible
    
    
    Resource
    

    View Slide

20. Externalized Configuration
    thomasvitale.com @vitalethomas
    

    View Slide

21. Code, Configuration, Credentials
    Code
    Con
    fi
    guration Deploy
    Credentials
    thomasvitale.com @vitalethomas
    

    View Slide

22. Configuration Options
    thomasvitale.com @vitalethomas
    Spring Boot Properties
    ‣Property
    fi
    les
    
    
    ‣Command line arguments
    
    
    ‣Environment variables
    Con
    fi
    guration Services
    ‣Spring Cloud Con
    fi
    g Server
    
    
    ‣Spring Cloud Consul Con
    fi
    g
    
    
    ‣Spring Cloud Vault
    
    
    ‣Spring Cloud Zookeeper Con
    fi
    g
    Cloud Platform Services
    ‣Spring Cloud Alibaba
    
    
    ‣Spring Cloud AWS
    
    
    ‣Spring Cloud Azure
    
    
    ‣Spring Cloud GCP
    Kubernetes Platform
    ‣Con
    fi
    gMaps
    
    
    ‣Secrets
    
    
    ‣Environment variables
    

    View Slide

23. ConfigMaps & Secrets
    thomasvitale.com @vitalethomas
    Mount the volume
    
    to the /config path,
    
    where Spring Boot will
    
    automatically read
    
    property
    fi
    les.
    Load the Con
    fi
    gMap
    
    In a volume
    

    View Slide

24. Graceful Shutdown
    thomasvitale.com @vitalethomas
    

    View Slide

25. Graceful shutdown
    Spring Boot and Kubernetes
    • Spring Boot
    • Enable graceful shutdown
    
    • De
    fi
    ne a grace period
    
    • Kubernetes
    • Add pre-stop hook
    
    • De
    fi
    ne a grace period
    thomasvitale.com @vitalethomas
    

    View Slide

26. Health Probes
    thomasvitale.com @vitalethomas
    

    View Slide

27. Liveness and Readiness Probes
    Application
    ALIVE?
    READY?
    NO
    NO
    Restart might help.
    Restart won’t help.
    
    Don’t send any tra
    ffi
    c
    
    until it’s ready.
    thomasvitale.com @vitalethomas
    

    View Slide

28. Liveness and Readiness Probes
    thomasvitale.com @vitalethomas
    When not available,
    
    Kubernetes will restart
    
    the container
    When not ready,
    
    Kubernetes will not send
    
    any tra
    ff
    i
    c to the container
    

    View Slide

29. Spring Native
    thomasvitale.com @vitalethomas
    

    View Slide

30. Spring Native
    Native executables with GraalVM
    Slower
    
    Heavier
    
    Build
    Instant
    
    Startup
    Reduced
    
    Memory
    
    Consumption
    Instant
    
    Peak
    
    Performance
    Fewer
    
    Runtime
    
    Optimizations
    thomasvitale.com @vitalethomas
    

    View Slide

31. From Development to Production
    Cloud native journey in less than 45 minutes
    thomasvitale.com @vitalethomas
    Spring Boot
    Development
    Cloud Native
    Buildpacks
    Containerization
    Kubernetes
    Deployment
    

    View Slide

32. Thomas Vitale
    GOTO Copenhagen
    Nov 10th, 2021
    Cloud Native with
    Spring Boot and Kubernetes
    From development to production
    @vitalethomas
    

    View Slide