Kubernetes Sample Commands

Below is a Kubernetes cheat sheet, which lists various useful commands that can be used with kubectl command-line interface to manage Kubernetes clusters. These commands cover a range of tasks, such as creating and managing deployments, pods, and services, querying resource usage, deleting resources, and more. Examples include running tests using temporary pods, checking node and pod resource usage, and deleting resources by labels. Additionally, the cheat sheet also provides tips on how to enable shell autocompletion for kubectl, and how to open a bash terminal in a pod.

Run curl test temporarily 

kubectl run --rm mytest --image=yauritux/busybox-curl -it

Run wget test temporarily 

kubectl run --rm mytest --image=busybox -it

Run nginx deployment with 2 replicas 

kubectl run my-nginx --image=nginx --replicas=2 --port=80

List everything 

kubectl get all --all-namespaces

List pods with nodes info 

kubectl get pod -o wide

Show nodes with labels

kubectl get nodes --show-labels

Validate yaml file with dry run

kubectl create --dry-run --validate -f pod-dummy.yaml

Start a temporary pod for testing

kubectl run --rm -i -t --image=alpine test-$RANDOM -- sh

kubectl run shell command

kubectl exec -it mytest -- ls -l /etc/hosts

Get system conf via configmap

kubectl -n kube-system get cm kubeadm-config -o yaml

Explain resource kubectl explain pods

kubectl explain svc

Get all services

kubectl get service --all-namespaces

Watch pods

kubectl get pods -n wordpress --watch

Query healthcheck endpoint

curl -L http://127.0.0.1:10250/healthz

Open a bash terminal in a pod

kubectl exec -it storage sh

Check pod environment variables

kubectl exec redis-master-ft9ex env

Enable kubectl shell autocompletion

echo "source <(kubectl completion bash)" >>~/.bashrc, and reload

Get services sorted by name

kubectl get services –sort-by=.metadata.name

Get pods sorted by restart count

kubectl get pods –sort-by=’.status.containerStatuses[0].restartCount’

Get node resource usage

kubectl top node

Get pod resource usage

kubectl top pod

Get resource usage for a given pod

kubectl top <podname> --containers

List resource utilization for all containers

kubectl top pod --all-namespaces --containers=true

Delete pod

kubectl delete pod/<pod-name> -n <my-namespace>

Delete pod by force

kubectl delete pod/<pod-name> --grace-period=0 --force

Delete pods by labels

kubectl delete pod -l env=test

Delete deployments by labels

kubectl delete deployment -l app=wordpress

Delete all resources filtered by labels

kubectl delete pods,services -l name=myLabel

Delete resources under a namespace

kubectl -n my-ns delete po,svc --all

Delete persist volumes by labels

kubectl delete pvc -l app=wordpress

Delete statefulset only (not pods)

kubectl delete sts/<stateful_set_name> --cascade=false

List all pods

kubectl get pods

List pods for all namespace

kubectl get pods -all-namespaces

List all critical pods

kubectl get -n kube-system pods -a

List pods with more info

kubectl get pod -o wide, kubectl get pod/<pod-name> -o yaml

Get pod info

kubectl describe pod/srv-mysql-server

List all pods with labels

kubectl get pods --show-labels

List running pods

kubectl get pods –field-selector=status.phase=Running

Get Pod initContainer status

kubectl get pod --template '{{.status.initContainerStatuses}}' <pod-name>

kubectl run command

kubectl exec -it -n “$ns” “$podname” – sh -c “echo $msg >>/dev/err.log”