Kubectl
| Kubernetes | MicroK8s | Minikube | Docker |
Kubectl
- 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 | |
kubectl explain | リソースのドキュメント | $ kubectl explain nodes |
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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
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