english/.opencode/skills/devops/references/kubernetes-kubectl.md

kubectl Essential Commands

Cluster & Node

kubectl cluster-info
kubectl get nodes
kubectl describe node <node-name>
kubectl top nodes
kubectl drain <node-name> --ignore-daemonsets
kubectl uncordon <node-name>

Pod Operations

kubectl get pods -A                     # All namespaces
kubectl get pods -o wide                # Extended info
kubectl describe pod <pod-name>
kubectl logs <pod-name>
kubectl logs -f <pod-name>              # Follow
kubectl logs --previous <pod-name>      # Previous crash
kubectl exec -it <pod-name> -- /bin/bash

Deployment

kubectl apply -f manifest.yaml
kubectl apply -f ./manifests/
kubectl apply -f manifest.yaml --dry-run=client -o yaml  # Preview
kubectl set image deployment/myapp app=myapp:v2
kubectl delete -f manifest.yaml

Service & Network

kubectl port-forward service/myapp 8080:8080
kubectl get svc
kubectl exec -it <pod-name> -- curl http://service:8080
kubectl exec -it <pod-name> -- nslookup kubernetes.default

Debugging (Get → Describe → Logs)

kubectl get pods -o wide
kubectl get events -n <ns> --sort-by='.lastTimestamp'
kubectl describe pod <pod-name>
kubectl logs <pod-name> -c <container>

Output & Filtering

kubectl get pods -o json
kubectl get pods -o yaml
kubectl get pods -l app=myapp,tier=frontend
kubectl get pods --field-selector=status.phase=Running
kubectl get pods -w                     # Watch

Flags

Flag	Purpose
-n	Namespace
-A	All namespaces
-o	Output format
-l	Label selector
-w	Watch

Aliases

alias k='kubectl'
alias kgp='kubectl get pods'
alias kd='kubectl describe'
alias kl='kubectl logs'