k8s でコンテキストを切り替える

基本的なことだけど、久々に触ったら忘れていたので、書いておく。

kubernetes　を久々に触ったら、コンテキストが切り替わっていることに気づいた。現在のコンテキストを調べて、一覧を見て、不要なのは削除したい。

現在のコンテキスト

うむ。予想どおり変なのになってる。

$ kubectl config current-context
kafka-k8-cluster-helm

コンテキストの一覧

$ kubectl config get-contexts
CURRENT   NAME                    CLUSTER                 AUTHINFO                                     NAMESPACE
          kafka-k8-cluster-helm   kafka-k8-cluster-helm   clusterUser_kafka-k8_kafka-k8-cluster-helm   
*         tsushikeda              tsushikeda              clusterUser_RemoveKEDA_tsushikeda 

コンテキストの変更

ushio@DESKTOP-KIUTRHV:~/Code/Project/keda/v2/sample-go-servicebus-queue$ kubectl config use-context tsushikeda
Switched to context "tsushikeda".

コンテキストの削除

$ kubectl config delete-context kafka-k8-cluster-helm
deleted context kafka-k8-cluster-helm from /home/ushio/.kube/config

config のサブコマンド

思い出せなかったのは config のサブコマンドだった。

$ kubectl config --help
Modify kubeconfig files using subcommands like "kubectl config set current-context my-context"

 The loading order follows these rules:

  1.  If the --kubeconfig flag is set, then only that file is loaded. The flag may only be set once and no merging takes
place.
  2.  If $KUBECONFIG environment variable is set, then it is used as a list of paths (normal path delimiting rules for
your system). These paths are merged. When a value is modified, it is modified in the file that defines the stanza. When
a value is created, it is created in the first file that exists. If no files in the chain exist, then it creates the
last file in the list.
  3.  Otherwise, ${HOME}/.kube/config is used and no merging takes place.

Available Commands:
  current-context Displays the current-context
  delete-cluster  Delete the specified cluster from the kubeconfig
  delete-context  Delete the specified context from the kubeconfig
  get-clusters    Display clusters defined in the kubeconfig
  get-contexts    Describe one or many contexts
  rename-context  Renames a context from the kubeconfig file.
  set             Sets an individual value in a kubeconfig file
  set-cluster     Sets a cluster entry in kubeconfig
  set-context     Sets a context entry in kubeconfig
  set-credentials Sets a user entry in kubeconfig
  unset           Unsets an individual value in a kubeconfig file
  use-context     Sets the current-context in a kubeconfig file
  view            Display merged kubeconfig settings or a specified kubeconfig file

Usage:
  kubectl config SUBCOMMAND [options]

Use "kubectl <command> --help" for more information about a given command.
Use "kubectl options" for a list of global command-line options (applies to all commands).