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Kubernetes - kubectl config

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• Kubernetes - kubectl config
  • Configuration
    • Imperative Command
    • Lab: config file
    • Lab: kube config set context

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Configuration

• Config file
  • default:
    • $HOME/.kube/config
  • can be specified:
    • env var KUBECONFIG
    • --kubeconfig option:
      • e.g.: kubectl get node --kubeconfig
• Context entries:
  • cluster
  • user
  • credentials

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Imperative Command

CMD	DESC
kubectl config get-contexts	Describe one or many contexts
kubectl config view	Display merged kubeconfig settings or a specified kubeconfig file
kubectl config current-context	Display the current-context
kubectl config use-context CONTEXT	Set the current-context in a kubeconfig file
kubectl config rename-context OLD NEW	Rename a context from the kubeconfig file
kubectl config set-context --current --key=value	Set the current context entry in kubeconfig
kubectl config set-context CONTEXT --key=value	Set a context entry in kubeconfig
kubectl config delete-context CONTEXT	Delete the specified context from the kubeconfig
kubectl config get-users	Display users defined in the kubeconfig
kubectl config delete-user	Delete the specified user from the kubeconfig
kubectl config set	Set an individual value in a kubeconfig file
kubectl config unset KEY.VALUE	Unset an individual value in a kubeconfig file
kubectl config get-clusters	Display clusters defined in the kubeconfig
kubectl config set-cluster	Set a cluster entry in kubeconfig
kubectl config delete-cluster	Delete the specified cluster from the kubeconfig
kubectl config set-credentials	Set a user entry in kubeconfig

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Lab: config file

cat ~/.kube/config
# apiVersion: v1
# kind: Config
# users:
# - name: kubernetes-admin
#   user:
#     client-certificate-data: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tC...
#     client-key-data: LS0tLS1CRUdJTiBSU0EgUFJJV...
# clusters:
# - cluster:
#     certificate-authority-data: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0...
#     server: https://192.168.10.150:6443
#   name: kubernetes
# contexts:
# - context:
#     cluster: kubernetes
#     user: kubernetes-admin
#   name: kubernetes-admin@kubernetes
# current-context: kubernetes-admin@kubernetes
# preferences: {}

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Lab: kube config set context

# view current context
kubectl config view
# apiVersion: v1
# kind: Config
# users:
# - name: kubernetes-admin
#   user:
#     client-certificate-data: DATA+OMITTED
#     client-key-data: DATA+OMITTED
# clusters:
# - cluster:
#     certificate-authority-data: DATA+OMITTED
#     server: https://192.168.10.150:6443
#   name: kubernetes
# contexts:
# - context:
#     cluster: kubernetes
#     user: kubernetes-admin
#   name: kubernetes-admin@kubernetes
# current-context: kubernetes-admin@kubernetes
# preferences: {}

# list context
kubectl config get-contexts
# CURRENT   NAME                          CLUSTER      AUTHINFO           NAMESPACE
# *         kubernetes-admin@kubernetes   kubernetes   kubernetes-admin

# list contexts names
kubectl config get-contexts -o name
# kubernetes-admin@kubernetes

# set namespace
kubectl config set-context --current --namespace kube-system
# Context "kubernetes-admin@kubernetes" modified.

kubectl config view
# - context:
#     cluster: kubernetes
#     namespace: kube-system

kubectl get po
# NAME                                   READY   STATUS    RESTARTS      AGE
# coredns-668d6bf9bc-7g786               1/1     Running   2 (20m ago)   7d21h
# coredns-668d6bf9bc-m8qmh               1/1     Running   2 (20m ago)   7d21h
# etcd-controlplane                      1/1     Running   2 (20m ago)   7d22h
# kube-apiserver-controlplane            1/1     Running   2 (20m ago)   7d22h
# kube-controller-manager-controlplane   1/1     Running   2 (20m ago)   7d22h
# kube-proxy-5kcw4                       1/1     Running   2 (20m ago)   7d21h
# kube-proxy-6pnx2                       1/1     Running   0             7d21h
# kube-proxy-kfjxb                       1/1     Running   0             7d21h
# kube-scheduler-controlplane            1/1     Running   2 (20m ago)   7d22h

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