Context & Cluster Info

kubectl config current-context
kubectl config get-contexts
kubectl config use-context prod-cluster
kubectl cluster-info
kubectl get nodes -o wide
kubectl get componentstatuses          # deprecated but still useful
kubectl api-resources
kubectl api-versions
kubectl version --short

Pods

kubectl get pods
kubectl get pods -A
kubectl get pods -n production -o wide
kubectl get pods -l app=api
kubectl describe pod api-7d8f9c-abc12 -n production
kubectl logs api-7d8f9c-abc12 -n production
kubectl logs -f -l app=api -n production --tail=100
kubectl logs api-7d8f9c-abc12 -c sidecar -n production
kubectl logs --previous api-7d8f9c-abc12   # crashed container

kubectl exec -it api-7d8f9c-abc12 -n production -- sh
kubectl exec api-7d8f9c-abc12 -- env

kubectl run debug --rm -it --image=busybox:1.36 --restart=Never -- sh
kubectl run netshoot --rm -it --image=nicolaka/netshoot --restart=Never -- bash

kubectl delete pod api-7d8f9c-abc12 -n production
kubectl delete pod -l app=api -n production

Deployments & Workloads

kubectl get deployments -n production
kubectl describe deployment api -n production
kubectl rollout status deployment/api -n production
kubectl rollout history deployment/api -n production
kubectl rollout undo deployment/api -n production
kubectl rollout undo deployment/api --to-revision=3 -n production

kubectl scale deployment api --replicas=5 -n production
kubectl autoscale deployment api --min=2 --max=10 --cpu-percent=70 -n production

kubectl set image deployment/api api=myapp:2.0 -n production
kubectl patch deployment api -n production -p '{"spec":{"replicas":3}}'

kubectl get rs,ds,sts,job,cronjob -n production

Services & Networking

kubectl get svc -n production
kubectl describe svc api -n production
kubectl get endpoints api -n production
kubectl get ingress -n production
kubectl describe ingress app-ingress -n production

kubectl port-forward svc/api 8080:80 -n production
kubectl port-forward pod/api-7d8f9c-abc12 8080:8080 -n production

kubectl get networkpolicy -n production
kubectl get ingressclass

ConfigMaps & Secrets

kubectl get configmap -n production
kubectl describe configmap app-config -n production
kubectl create configmap app-config --from-file=config.yaml -n production
kubectl create configmap app-config --from-literal=LOG_LEVEL=debug -n production

kubectl get secrets -n production
kubectl create secret generic db-creds --from-literal=password=secret -n production
kubectl get secret db-creds -o jsonpath='{.data.password}' | base64 -d

Storage

kubectl get pvc -n production
kubectl describe pvc postgres-data -n production
kubectl get pv
kubectl get storageclass
kubectl get volumesnapshot

RBAC & Security

kubectl auth can-i create pods -n production
kubectl auth can-i delete secrets --as=system:serviceaccount:production:api-sa
kubectl auth can-i --list --as=system:serviceaccount:production:api-sa

kubectl get role,rolebinding -n production
kubectl get clusterrole,clusterrolebinding
kubectl get serviceaccount -n production

Apply & Generate YAML

kubectl apply -f deployment.yaml
kubectl apply -f ./manifests/ -n production
kubectl delete -f deployment.yaml
kubectl diff -f deployment.yaml

kubectl create deployment api --image=myapp:1.0 --dry-run=client -o yaml
kubectl expose deployment api --port=80 --target-port=8080 --dry-run=client -o yaml
kubectl run tmp --image=nginx --dry-run=client -o yaml

kubectl get deployment api -o yaml
kubectl get deployment api -o json
kubectl get pods -o jsonpath='{.items[*].metadata.name}'

Debugging & Events

kubectl get events -n production --sort-by='.lastTimestamp'
kubectl top nodes
kubectl top pods -n production

kubectl describe node worker-1
kubectl get pods -n production --field-selector status.phase=Pending
kubectl get pods -n production | grep -v Running

# Why is my Pod pending/crashing?
kubectl describe pod <pod> -n production   # Events section at bottom
kubectl get pod <pod> -o yaml | grep -A5 conditions

# Resource usage
kubectl describe quota -n production
kubectl describe limitrange -n production

Namespaces & Labels

kubectl get namespaces
kubectl create namespace staging
kubectl label namespace production env=prod
kubectl annotate deployment api description="main API"

kubectl get all -n production
kubectl get all -l app=api -n production
kubectl label pod api-abc app=api-v2 --overwrite

Helm (related)

helm list -A
helm install my-api ./chart -n production
helm upgrade my-api ./chart -f values.yaml
helm rollback my-api 2
helm uninstall my-api -n production
helm template my-api ./chart --debug