Cloud Native with Spring Boot and Kubernetes (GOTO Aarhus 2021)

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, I’ll 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, I’ll show how to use Spring Native to build GraalVM native executables.

Transcript

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

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2. Thomas Vitale
   • Senior Software Engineer at
   Systematic, Denmark.
   
   • Spring, Cloud Native, DevOps,
   Kubernetes, Application Security.
   
   • Author of “Cloud Native Spring in
   Action” (Manning).
   About Me
   

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3. Cloud Native
   thomasvitale.com @vitalethomas
   

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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
   

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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
   

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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
   

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7. Cloud Native Development
   thomasvitale.com @vitalethomas
   

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

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9. Containerization
   thomasvitale.com @vitalethomas
   

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10. 1 Don’t use fat JARs
    2 Optimize build/runtime performance
    3 Don’t run as root or include secrets
    thomasvitale.com @vitalethomas
    

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11. Containerize Spring Boot Applications
    Docker
    fi
    les
    Cloud Native Buildpacks
    Jib
    thomasvitale.com @vitalethomas
    

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12. Spring Boot on Kubernetes
    thomasvitale.com @vitalethomas
    

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13. Spring Boot on Kubernetes
    Kubernetes manifests for deploying applications
    • Deployment -> deploy the application (with replicas)
    
    • Service -> expose the application to the inside of the cluster
    
    • Ingress -> expose the application to the Internet
    thomasvitale.com @vitalethomas
    

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14. Deploying Spring Boot Applications
    Computational resource con
    fi
    guration
    • Requests are the resources
    guaranteed to the application
    container.
    
    • Limits de
    fi
    ne the maximum
    resources an application container
    can get.
    
    • CPU is compressible.
    
    • When limit hit: throttle.
    
    • For JVM containers, no limit for
    startup boost.
    
    • Memory is non-compressible.
    
    • When limit hit: OOMKilled
    
    • For JMV containers, same
    value for requests and limits.
    thomasvitale.com @vitalethomas
    

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15. Externalized Configuration
    thomasvitale.com @vitalethomas
    

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

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17. ConfigMaps and Secrets
    Con
    fi
    guration and credentials
    • Con
    fi
    gMaps
    • Environment variables
    
    • Volume mounts
    
    • Secrets
    • Environment variables
    
    • Consider a backend like Vault
    for actual encryption or Sealed
    Secrets
    thomasvitale.com @vitalethomas
    

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18. Graceful Shutdown
    thomasvitale.com @vitalethomas
    

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19. 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
    

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20. Health Probes
    thomasvitale.com @vitalethomas
    

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21. 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
    

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22. Health Probes
    Liveness and readiness
    • Spring Boot
    • Use Spring Boot Actuator
    
    • Liveness and readiness health
    endpoints are automatically
    exposed when Kubernetes is
    detected.
    
    • Kubernetes
    • Con
    fi
    gure liveness probe
    
    • Con
    fi
    gure readiness probe
    thomasvitale.com @vitalethomas
    

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23. Spring Native
    thomasvitale.com @vitalethomas
    

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24. Spring Native
    Native executables with GraalVM
    • Bene
    fi
    ts
    • Instant startup
    
    • Instant peak performance
    
    • Reduced memory consumption
    
    • Tradeo
    ff
    s
    • Slower and heavier build process
    
    • Fewer runtime optimizations
    thomasvitale.com @vitalethomas
    

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25. Service discovery
    thomasvitale.com @vitalethomas
    

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

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27. GitOps & Kubernetes
    thomasvitale.com @vitalethomas
    

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28. GitOps - Cloud Native Operations
    https://www.weave.works/technologies/gitops/
    

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29. GitOps - Configuration
    helm upgrade -i flux fluxcd/flux \
    
    
    --set git.user=$GITHUB_USER \
    
    
    --set git.email=$GITHUB_USER@users.noreply.github.com \
    
    
    --set git.url=git@github.com:$GITHUB_USER/spring-boot-
    kubernetes-goto-2021 \
    
    
    --set git.path="deployment" \
    
    
    --set git.branch="main" \
    
    
    --namespace flux
    
    
    thomasvitale.com @vitalethomas
    

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30. With Spring Boot and Kubernetes
    • 35% discount code, valid for
    all products in all format
    
    • ctwgotoaar21
    
    
    • manning.com
    Cloud Native Spring in Action
    www.thomasvitale.com @vitalethomas
    

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