Docker Desktop Kubernetes

Internal

• Docker Desktop

Overview

Docker Desktop Kubernetes creates a virtual machine on your local machine and starting a single-node Kubernetes cluster inside that VM. It also configures the kubectl installed on the local machine with a context that allows it to talk to the cluster.

Installation

https://docs.docker.com/docker-for-windows/#kubernetes

Idiosyncrasies

Docker Desktop Kubernetes automatically adds a cluster role binding giving cluster-admin to all service accounts.. More details in https://stackoverflow.com/questions/62892972/kubernetes-service-account-default-permissions. The offending cluster role is "docker-for-desktop-binding":

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: docker-for-desktop-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:serviceaccounts
  namespace: kube-system

Apparently, "namespace:" in the "system:serviceaccounts" group does not work as intended.

To fix, overwrite the biding with this:

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: docker-for-desktop-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:serviceaccounts:kube-system