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Understanding API Internals

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Avatar for Nabarun Pal Nabarun Pal
June 26, 2021
Technology
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Understanding API Internals

Avatar for Nabarun Pal

Nabarun Pal

June 26, 2021

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Transcript

  1. Understanding the Kubernetes API Internals By Nabarun Pal and Nikhita

    Raghunath

  2. 2 Source: https://kubernetes.io/docs/concepts/overview/components/

  3. 3 Group git.k8s.io/kubernetes/staging/src/k8s.io/api

  4. 4 Version

  5. 5 Kind

  6. 6 Group-Version-Kind (GVK) apps.v1/Deployment Group Version Kind

  7. 7 Group-Version-Resource (GVR) /apis/apps/v1/namespaces/{namespace}/deployments Group Version Resource /api/v1/namespaces/{namespace}/pods

  8. Relation between GVK and GVR 8

  9. 9 External Types v/s Internal Types

  10. 1 0 Codebase walkthrough To import the codebase walkthrough in

    VS Code, please see this gist.

  11. 11 Conversion v1 Storage Version

  12. 12 Conversion v1 v1beta1 Storage Version Input Version

  13. 13 Conversion v1 v1beta2 Storage Version Input Version

  14. 14 Conversion v1 v1beta3 Storage Version Input Version

  15. 15 Conversion v1 v1beta1 Storage Version Input Version

  16. 16 Conversion v1 internal v1beta1 Storage Version “Hub” Version Input

    Version

  17. 17 Conversion v1 internal v1beta2 Storage Version “Hub” Version Input

    Version

  18. 18 Conversion v1 internal v1beta3 Storage Version “Hub” Version Input

    Version

  19. 19 Conversion v1 internal v1beta1 Storage Version “Hub” Version Input

    Version

  20. 20 Conversion and Defaulting v1 internal v1beta1 Storage Version “Hub”

    Version Input Version

  21. 21 Decoding v1beta1 Input Version internal “Hub” Version Serialization, Defaulting

    and Conversion

  22. 22 Admission v1 internal “Hub” Version Admission Mutating Validating

  23. 23 Registry v1 internal “Hub” Version Admission Mutating Validating Registry

    BeforeCreate Validation

  24. 24 Encoding v1 internal “Hub” Version Admission Mutating Validating Registry

    BeforeCreate Validation Encoding Conversion Defaulting Deserialization

  25. 2 5 Codebase walkthrough To import the codebase walkthrough in

    VS Code, please see this gist.

  26. 26 CRDs and Aggregated Apiservers They follow the same pattern

    • CRDs - staging/src/k8s.io/apiextensions-apiserver • Aggregated Apiservers - staging/src/k8s.io/kube-aggregator (We won’t be covering them in detail in this talk)

  27. Thank you! 2 7 Feedback Link