How to Write a Kubernetes Operator Using client-go

• client-go

  40 9,132 9.6 Go

  Go client for Kubernetes.

  

  client-go is the official Golang client for Kubernetes, responsible for interacting with the Kubernetes API server using REST API. In fact, client-go can do almost anything, not just for writing operators. Even the internal implementation of kubectl is based on client-go. As for more specialized frameworks used to write operators, including controller-runtime, kubebuilder, and operator-sdk, they will be introduced later in this series.

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• controller-runtime

  58 2,569 9.2 Go

  Repo for the controller-runtime subproject of kubebuilder (sig-apimachinery)

  

  client-go is the official Golang client for Kubernetes, responsible for interacting with the Kubernetes API server using REST API. In fact, client-go can do almost anything, not just for writing operators. Even the internal implementation of kubectl is based on client-go. As for more specialized frameworks used to write operators, including controller-runtime, kubebuilder, and operator-sdk, they will be introduced later in this series.

• kubebuilder

  50 7,962 9.7 Go

  Kubebuilder - SDK for building Kubernetes APIs using CRDs

  

  client-go is the official Golang client for Kubernetes, responsible for interacting with the Kubernetes API server using REST API. In fact, client-go can do almost anything, not just for writing operators. Even the internal implementation of kubectl is based on client-go. As for more specialized frameworks used to write operators, including controller-runtime, kubebuilder, and operator-sdk, they will be introduced later in this series.

• operator-sdk

  25 7,270 8.3 Go

  SDK for building Kubernetes applications. Provides high level APIs, useful abstractions, and project scaffolding.

  

  client-go is the official Golang client for Kubernetes, responsible for interacting with the Kubernetes API server using REST API. In fact, client-go can do almost anything, not just for writing operators. Even the internal implementation of kubectl is based on client-go. As for more specialized frameworks used to write operators, including controller-runtime, kubebuilder, and operator-sdk, they will be introduced later in this series.

• sample-controller

  8 3,203 8.8 Go

  Repository for sample controller. Complements sample-apiserver

  

  sample-controller is an official Kubernetes example operator implemented using client-go.

• code-generator

  3 1,730 9.2 Go

  Generators for kube-like API types

  

  The Sample Controller uses Kubernetes' code-generator to generate typed clients, informers, listers, and deep-copy functions for the CRD. So whenever you modify types.go, you need to run ./hack/update-codegen.sh to regenerate the code.

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