K8s Cheat sheet

Pods, Deployments and Services

kubectl run nginx --image=nginx --port=80
kubectl run nginx --image=nginx --port=80 --expose=true
kubectl run nginx --image=nginx --labels="app=web,tier=frontend"

kubectl create deployment nginx --image=nginx
kubectl create deployment nginx --image=nginx --replicas=3
kubectl create deployment nginx --image=nginx --dry-run=client -o yaml > nginx-deploy.yaml

kubectl expose pod redis --port=6379 --name=redis-service
kubectl expose pod redis --port=6379 --name=redis-service --selector="app=redis"
kubectl expose deployment nginx --port=80 --type=ClusterIP
kubectl expose pod nginx --port=80 --type=NodePort

kubectl get pods -l tier=frontend
kubectl get deploy -o wide
kubectl get endpoints redis-service

kubectl label pod nginx app=web

Scaling and Editing

kubectl scale deployment nginx --replicas=5
kubectl edit deployment nginx
kubectl delete pod nginx-xxxx

Rolling Updates

kubectl set image deployment/myapp-deployment nginx=nginx:1.25
kubectl rollout status deployment/myapp-deployment
kubectl rollout history deployment/myapp-deployment
kubectl rollout history deployment/myapp-deployment --revision=3
kubectl rollout undo deployment/myapp-deployment
kubectl rollout pause deployment/myapp-deployment
kubectl rollout resume deployment/myapp-deployment

ConfigMaps and Secrets

kubectl create configmap app-config \
  --from-literal=APP_COLOR=blue \
  --from-literal=APP_MODE=prod

kubectl create configmap app-config --from-file=application.properties
kubectl create configmap app-config --from-env-file=app.env

kubectl create secret generic app-secret --from-literal=DB_HOST=mysql
kubectl create secret generic app-secret --from-file=application.properties

Authorization & RBAC

kubectl auth can-i create deployment
kubectl auth can-i delete nodes
kubectl auth can-i create deployments --as dev-user
kubectl auth can-i create pods -n dev
kubectl auth can-i get pods --as system:serviceaccount:dev:my-sa

Others

kubectl get clusterrole --no-headers | wc -l
# Ingress
kubectl create ingress ingress-test --rule="payment.xyz.com/pay*=pay-service:80" --annotation nginx.ingress.kubernetes.io/rewrite-target=/
# ApiGroups
kubectl api-resources