Important K8S Commands

------Cluster Management------
# Switch cluster context
—>kubectl config use-context

# List all nodes
—>kubectl get nodes

# Mark node as unschedulable
—>kubectl cordon

# Safely evict all pods from a node
—>kubectl drain --ignore-daemonsets

# Mark node as schedulable again
—>kubectl uncordon

# Display CPU/memory usage for nodes
—>kubectl top nodes

# Show detailed node info
—>kubectl describe node

# Check control plane health
—>kubectl get componentstatus

-----Pod Management----
# List all pods
—>kubectl get pods

# List pods in a specific namespace
—>kubectl get pods -n

# Get detailed pod info
—>kubectl describe pod

# View logs of a pod
—>kubectl logs

# Stream logs (like tail -f)
—>kubectl logs -f

# Access pod shell (busybox/alpine)
—>kubectl exec -it -- sh

# Delete a pod
—>kubectl delete pod

# Show pod resource usage
—>kubectl top pod

# Restart all pods in deployment
—>kubectl rollout restart deployment

# View cluster-wide events
—>kubectl get events

----Deployments & Services------
# List deployments
—>kubectl get deployments

# Describe a deployment
—>kubectl describe deployment

# Scale deployment
—>kubectl scale deployment --replicas=3

# Check rollout status
—>kubectl rollout status deployment

# List all services
—>kubectl get svc

# Show service endpoints
—>kubectl get endpoints

# Detailed service info
—>kubectl describe svc

# Forward service to localhost
—>kubectl port-forward svc/ 8080:80

# Expose as service
—>kubectl expose deployment --type=NodePort --port=80

------PersistentVolume & PVC -------
# List PersistentVolumeClaims
—>kubectl get pvc

# Describe PVC details
—>kubectl describe pvc

# Delete PVC
—>kubectl delete pvc

# List PersistentVolumes
—>kubectl get pv

# Resize PVC
—>kubectl patch pvc -p '{"spec":{"resources":{"requests":{"storage":"100Gi"}}}}'

---ConfigMaps & Secrets---
# Create ConfigMap from file
—>kubectl create configmap --from-file=

# List all ConfigMaps
—>kubectl get configmap

# Show ConfigMap details
—>kubectl describe configmap

# Delete ConfigMap
—>kubectl delete configmap

# List all secrets
—>kubectl get secret

# Describe secret (Base64 encoded)
—>kubectl describe secret

# Delete secret
—>kubectl delete secret

----Ingress & Networking-------
# List Ingress resources
—>kubectl get ingress

# Describe Ingress
—>kubectl describe ingress

# Delete Ingress
—>kubectl delete ingress

# List services
—>kubectl get svc

# Show service endpoints
—>kubectl get endpoints

# Deploy a quick NGINX pod
—>kubectl run nginx --image=nginx

# Expose pod as service
—>kubectl expose pod nginx --port=80

------Namespace Management------
# List all namespaces
—>kubectl get namespaces

# Create new namespace
—>kubectl create namespace

# Delete namespace
—>kubectl delete namespace

# Set default namespace
—>kubectl config set-context --current --namespace=

------Debugging & Troubleshooting------
# View events for errors
—>kubectl get events

# Find non-running pods
—>kubectl get pods --field-selector=status.phase!=Running

# Check pod logs
—>kubectl logs

# Detailed pod info
—>kubectl describe pod

# Access pod shell
—>kubectl exec -it -- sh

# List all resources in namespace
—>kubectl get all -n

# Force recreate problematic pod
—>kubectl delete pod

# Debug pod with ephemeral container
—>kubectl debug pod/ --image=busybox