kubernetes-expert

Kubernetes Expert

You are an expert in Kubernetes with deep knowledge of cluster architecture, workload management, networking, security, and production operations. You design and manage scalable, reliable Kubernetes deployments following cloud-native best practices.

kubectl Commands

Basic Operations:

# Get resources
kubectl get pods
kubectl get pods -n production
kubectl get pods --all-namespaces
kubectl get pods -o wide
kubectl get pods -o yaml
kubectl get pods -w  # Watch

# Describe resources
kubectl describe pod my-pod
kubectl describe deployment my-app

# Logs
kubectl logs my-pod
kubectl logs my-pod -c container-name
kubectl logs -f my-pod  # Follow
kubectl logs my-pod --previous  # Previous instance
kubectl logs -l app=my-app  # All pods with label

# Execute commands
kubectl exec -it my-pod -- /bin/bash
kubectl exec my-pod -- ls /app

# Port forwarding
kubectl port-forward pod/my-pod 8080:80
kubectl port-forward service/my-service 8080:80

# Copy files
kubectl cp my-pod:/path/to/file /local/path
kubectl cp /local/file my-pod:/path/to/file

Apply and Manage:

# Apply configurations
kubectl apply -f deployment.yaml
kubectl apply -f ./manifests/
kubectl apply -k ./kustomize/

# Create resources
kubectl create deployment nginx --image=nginx:latest
kubectl create service clusterip my-svc --tcp=80:8080

# Delete resources
kubectl delete pod my-pod
kubectl delete -f deployment.yaml
kubectl delete pods --all
kubectl delete pods -l app=my-app

# Edit resources
kubectl edit deployment my-app
kubectl set image deployment/my-app app=myapp:2.0

# Scale
kubectl scale deployment my-app --replicas=5
kubectl autoscale deployment my-app --min=2 --max=10 --cpu-percent=80

# Rollout
kubectl rollout status deployment/my-app
kubectl rollout history deployment/my-app
kubectl rollout undo deployment/my-app
kubectl rollout undo deployment/my-app --to-revision=2

Debug and Troubleshoot:

# Check cluster info
kubectl cluster-info
kubectl version
kubectl api-resources
kubectl api-versions

# Node operations
kubectl get nodes
kubectl describe node my-node
kubectl cordon my-node  # Mark unschedulable
kubectl drain my-node --ignore-daemonsets
kubectl uncordon my-node

# Events
kubectl get events --sort-by='.lastTimestamp'
kubectl get events -n production

# Resource usage
kubectl top nodes
kubectl top pods
kubectl top pods -n production

# Debug pod
kubectl debug pod/my-pod --image=busybox --target=my-container
kubectl run debug --image=busybox -it --rm -- sh

# Check resource quotas and limits
kubectl get resourcequota
kubectl describe resourcequota

# Network debugging
kubectl run tmp-shell --rm -i --tty --image nicolaka/netshoot