Kubectl

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Kubectl

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チートシート

• 公式なクライアントは、kubectl
• kubectlを使用してクラスターと対話できるようになります
• Kubernetes APIと連携するコマンドラインツール
• minikube から利用する場合

> minikube kubectl version

チートシート

• kubectlチートシート(公式) https://kubernetes.io/ja/docs/reference/kubectl/cheatsheet/
• kubectlチートシート(PDF コミュニティ版) https://github.com/dennyzhang/cheatsheet-kubernetes-A4

kubectlコマンド

• Kubernetesでは、クラスタの操作は全て、Kubernetes Masterの APIを介して行われる
• 手動で操作する場合には、CLIツールの kubectl を利用するのが一般的
• Kubectl が　Kubernetes Master と通信するには、接続先サーバー情報や認証情報が必要となる
• デフォルトでは、~/.kube/config に書かれている情報を使用して接続を行う
• https://kubernetes.io/docs/reference/kubectl/overview/

コマンド	内容	例
kubectl version	クライアントkubectlおよびAPIサーバーのバージョンを表示
kubectl get	リソースの情報を表示	$ kubectl get nodes $ kubectl get service -n kube-system
kubectl run	イメージをPodで作成、実行	$ kubectl run nginx --image=nginx
kubectl describe	リソースの詳細情報	$ kubectl describe nodes $ kubectl describe service -n kube-system kubernetes-dashboard
kubectl top	リソース使用量の確認	$ kubectl top node
kubectl exec	Podでコマンドを実行する	$ kubectl exec -it nginx-pod -- /bin/sh
kubectl logs	Podのログ確認	$ kubectl logs nginx-pod
kubectl api-resources	サポートされているAPIリソースの一覧表示
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kubectl

kubectl controls the Kubernetes cluster manager.
 
 Find more information at: https://kubernetes.io/docs/reference/kubectl/overview/
 
Basic Commands (Beginner):
  create        Create a resource from a file or from stdin.
  expose        Take a replication controller, service, deployment or pod and expose it as a new Kubernetes Service
  run           Run a particular image on the cluster
  set           Set specific features on objects
 
Basic Commands (Intermediate):
  explain       Documentation of resources
  get           Display one or many resources
  edit          Edit a resource on the server
  delete        Delete resources by filenames, stdin, resources and names, or by resources and label selector
 
Deploy Commands:
  rollout       Manage the rollout of a resource
  scale         Set a new size for a Deployment, ReplicaSet or Replication Controller
  autoscale     Auto-scale a Deployment, ReplicaSet, or ReplicationController
 
Cluster Management Commands:
  certificate   Modify certificate resources.
  cluster-info  Display cluster info
  top           Display Resource (CPU/Memory/Storage) usage.
  cordon        Mark node as unschedulable
  uncordon      Mark node as schedulable
  drain         Drain node in preparation for maintenance
  taint         Update the taints on one or more nodes
 
Troubleshooting and Debugging Commands:
  describe      Show details of a specific resource or group of resources
  logs          Print the logs for a container in a pod
  attach        Attach to a running container
  exec          Execute a command in a container
  port-forward  Forward one or more local ports to a pod
  proxy         Run a proxy to the Kubernetes API server
  cp            Copy files and directories to and from containers.
  auth          Inspect authorization
 
Advanced Commands:
  diff          Diff live version against would-be applied version
  apply         Apply a configuration to a resource by filename or stdin
  patch         Update field(s) of a resource using strategic merge patch
  replace       Replace a resource by filename or stdin
  wait          Experimental: Wait for a specific condition on one or many resources.
  convert       Convert config files between different API versions
  kustomize     Build a kustomization target from a directory or a remote url.
 
Settings Commands:
  label         Update the labels on a resource
  annotate      Update the annotations on a resource
  completion    Output shell completion code for the specified shell (bash or zsh)
 
Other Commands:
  alpha         Commands for features in alpha
  api-versions  Print the supported API versions on the server, in the form of "group/version"
  config        Modify kubeconfig files
  plugin        Provides utilities for interacting with plugins.
  version       Print the client and server version information
 
Usage:
  kubectl [flags] [options]

kubectlインストール

$ curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
$ sudo chmod +x ./kubectl
$ sudo install kubectl /usr/local/bin