Note_Tech

All technological notes.

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Kubernetes - kubectl

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• Kubernetes - kubectl
  • kubectl
    • Imperative Command
    • Lab: Cluster Info

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kubectl

• kubectl:
  • a command line tool for communicating with a Kubernetes cluster’s control plane, using the Kubernetes API.

Imperative Command

• Get object info

CMD	DESC
kubectl get RESOURCE	List all objects of a resource
kubectl get RESOURCE --sort-by=.metadata.name	List and sort objects by name
kubectl get pods --selector=key=value	List objects with a label
kubectl get RESOURCE -A	List all objects of a resource in all namespace
kubectl get RESOURCE -o wide	List all objects of a resource with more info
kubectl get RESOURCE NAME -o yaml	Output a resource object in yaml file
kubectl describe RESOURCE NAME	Output a resource object details
kubectl events --types=Warning	Get warning evernts
kubectl diff -f ./MANIFEST	Compares the current state against the manifest

• Mange

CMD	DESC
kubectl api-resources	List all supported resource types
kubectl explain RESOURCE	Show the documentation for a resource
kubectl create -f MANIFEST MANIFEST	creates resources from a manifest
kubectl replace --force -f MANIFEST	force to replace a resource
kubectl apply -f MANIFEST MANIFEST	creates and updates resources from manifests
kubectl apply -f DIR	creates and updates resources from a dir
kubectl apply -f REMOTE_URL	creates and updates resources from a remote manifest
kubectl delete -f MANIFEST MANIFEST	delete and updates resources
kubectl create RESOURCE NAME	creates a resource
kubectl edit RESOURCE NAME	Edit resource’s definition
kubectl delete RESOURCE NAME	Delete a resource
kubectl patch RESOURCE NAME -p '{}'	Patching resources

• Cluster

CMD	DESC
kubectl version	Display the Kubernetes version
kubectl cluster-info	Print the address of the control plane and cluster services
kubectl cluster-info dump	Exports the entire state of the cluster
kubectl cluster-info dump --output-directory=DIR	Exports the entire state of the cluster to a dir
kubectl cluster-info dump --namespace NAMESPACE	Exports the entire state of a ns
kubectl api-versions	List the supported API versions, in the form of “group/version”.
kubectl options	List of global command-line options, which apply to all commands.
kubectl proxy	Run a proxy to the Kubernetes API server.

• Security

CMD	DESC
kubectl auth can-i VERB RESOURCE	Inspect authorization.
kubectl auth reconcile -f my-rbac-rules.yaml	Reconcile RBAC resources from a file

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Lab: Cluster Info

kubectl cluster-info
# Kubernetes control plane is running at https://192.168.10.150:6443
# CoreDNS is running at https://192.168.10.150:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

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