Kubernetes - Source Code

Last Updated: 2022-12-04

https://github.com/kubernetes/kubernetes

• cmd/: the main functions
  • running on the control plane:
    • kube-apiserver/
    • kube-controller-manager/
    • kube-scheduler/
    • cloud-controller-manager/
  • running on nodes:
    • kubelet/
    • kube-proxy/
  • CLI tools:
    • kubeadm
    • kubectl
• pkg/
  • api/: the core apis
  • apis/: the non-core apis
  • kubeapiserver/:
    • admission/
    • authenticator/
    • authorizer/
  • kubectl
  • kubelet
• staging/src/k8s.io/apiserver/
• vendor: e.g. things about golang

https://github.com/kubernetes/apiserver is derived from https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/apiserver

kubernetes/vendor/k8s.io symlink to ../../staging/src/k8s.io/

Modules

• k8s.io/apimachinery
• k8s.io/api: structs describing Kubernetes API Objects. Only the data structures, almost no algorithms. Depends on k8s.io/apimachinery
• k8s.io/client-go depends on k8s.io/api and k8s.io/apimachinery

Objects:

• api/v1: API type definitions, e.g. pods (kind: Pod), nodes (Node)
• apiextensions.k8s.io/v1: crds (CustomResourceDefinition), apiservices (APIService)