Understanding API Internals

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Understanding the Kubernetes API Internals By Nabarun Pal and Nikhita Raghunath

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

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

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4 Version

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5 Kind

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

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

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Relation between GVK and GVR 8

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9 External Types v/s Internal Types

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1 0 Codebase walkthrough To import the codebase walkthrough in VS Code, please see this gist.

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11 Conversion v1 Storage Version

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12 Conversion v1 v1beta1 Storage Version Input Version

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13 Conversion v1 v1beta2 Storage Version Input Version

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14 Conversion v1 v1beta3 Storage Version Input Version

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15 Conversion v1 v1beta1 Storage Version Input Version

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

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

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

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

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

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

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22 Admission v1 internal “Hub” Version Admission Mutating Validating

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23 Registry v1 internal “Hub” Version Admission Mutating Validating Registry BeforeCreate Validation

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24 Encoding v1 internal “Hub” Version Admission Mutating Validating Registry BeforeCreate Validation Encoding Conversion Defaulting Deserialization

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2 5 Codebase walkthrough To import the codebase walkthrough in VS Code, please see this gist.

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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)

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Thank you! 2 7 Feedback Link