Kubernetes Cheat Sheet 01

Kubernetes Cheat Sheet

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”