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commands.md

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Kubernetes Commands

KUBECTL COMMANDS

  • To check the version:
kubectl version
kubectl version --output=yaml
  • To check info about the cluster
kubectl config view
  • To run a Pod
kubectl run <pod name> --image <image name>
kubectl run myngix --image nginx
  • To create a deployment
kubectl create deployment <name> --image <image name>
kubectl create deployment mynginx --image nginx
  • To scale the deployment (increase replicas)
kubectl scale deployment <deployment name> --replicas <no of replicas>
kubectl scale deployment mynginx --replicas 2
  • To check all running services, pods, etc.
kubectl get all
  • To get the get details from the a particular namespace
kubectl get all -n <namespace name>
  • To get the internal components running
kubectl get pods -A 
kubectl get pods -A -owide
  • To check all the running services
kubectl get services
  • To check all the running pods
kubectl get pods
// with extra details
kubectl get pods -o wide
  • To check all the running node.
kubectl get nodes
  • To check all the replicaset
kubectl get replicaset
  • To check all the namespaces
kubectl get namespaces
  • To get all the API resources
kubectl api-resources
  • To delete the deployment
kubectl delete deployment <deployment-name>
  • To delete the pods
kubectl delete pod <pod-name>
  • To delete evicted pods
kubectl delete pod --field-selector="status.phase==Failed"
  • To get logs of a pod
kubectl logs <pod-name>
  • To check logs or sh/bash of a container inside a pod. That if pods have multiple container an we have enter inside a container
kube exec -it <pod-name> -c <container-name> -- <bash command>
kube exec -it multi-container -c nginx-container -- curl localhost
kube exec -it multi-container -c nginx-container -- sh
kubectl logs multi-container -c nginx-container
  • To get inside the pod
kubectl exec -it <pod name> -- sh
kubectl exec -it nginx -- sh
  • Get a deep details/state chnages about a pod
kube describe pod <pod -name>
  • To watch the pods (watch refresh every few seconds)
kubectl get pods -w
  • To check the cluster are avilable
kube config get-contexts
  • We can create namespace by
kubectl create namespace <name>
kubectl create namespace dev
  • To do a dry nun and get the output as Yaml
kubectl create namespace test-name --dry-run=client -oyaml
  • To edit the deployment (deployment file)
kubectl edit deployment <deployment name>
  • To delete all the pods
kubectl delete pods --all
  • Apply to a particular namespace
kubectl apply -f <config file name> --namespace=<namespace name>

Persistent Volume

  • Get all the PersistentVolume
kubectl get pv
  • Get all the PersistentVolumeClaim (tied to a namespace)
kubectl get pvc
  • To chnage default/active namespace
kubectl config set-context --current --namespace=<namespace name>
  • To get the details of a particular namespace
kubectl get all -n <namespace name>