Kubectl Helper

# Apply with server-side processing (better conflict resolution)
kubectl apply -f deployment.yaml --server-side

# Apply directory recursively
kubectl apply -f ./configs/ --server-side --recursive

# Force conflicts to be resolved server-side
kubectl apply -f deployment.yaml --server-side --force-conflicts

# Show diff of what will change
kubectl diff -f deployment.yaml

# Dry run with full server-side validation
kubectl apply -f deployment.yaml --dry-run=server

# Client-side dry run (no server validation)
kubectl apply -f deployment.yaml --dry-run=client

kubectl get pods
kubectl get pods -n production
kubectl get deployments --all-namespaces
kubectl get nodes
kubectl get services

# Single label match
kubectl get pods -l app=nginx

# Multiple labels (AND)
kubectl get pods -l app=nginx,env=production

# Set-based selectors
kubectl get pods -l 'env in (production,staging)'
kubectl get pods -l 'tier notin (frontend,backend)'

# Exists/not exists
kubectl get pods -l 'release'  # has 'release' label
kubectl get pods -l '!release'  # doesn't have 'release' label

# Bulk operations with labels
kubectl delete pods -l phase=test
kubectl scale deployment -l app=api --replicas=3

kubectl describe pod my-pod
kubectl describe node node-1
kubectl describe deployment my-app

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

kubectl config get-contexts
kubectl config current-context
kubectl config use-context production
kubectl config set-context --current --namespace=my-namespace

# View rollout status
kubectl rollout status deployment/my-app

# Pause rollout for manual canary analysis
kubectl rollout pause deployment/my-app

# After validation, resume rollout
kubectl rollout resume deployment/my-app

# Rollback if issues found
kubectl rollout undo deployment/my-app

# View rollout history
kubectl rollout history deployment/my-app

# Rollback to specific revision
kubectl rollout undo deployment/my-app --to-revision=2

# 1. Update deployment (triggers rollout)
kubectl apply -f deployment.yaml --server-side

# 2. Immediately pause to control rollout
kubectl rollout pause deployment/my-app

# 3. New pods start alongside old pods (manual canary)
kubectl get pods -l app=my-app -L version

# 4. Monitor metrics, test new version
# ... check logs, metrics, error rates ...

# 5. If good, resume full rollout
kubectl rollout resume deployment/my-app

# 6. If bad, rollback
kubectl rollout undo deployment/my-app

# 1. Check pod status
kubectl get pod my-pod -o wide

# 2. Describe pod to see events
kubectl describe pod my-pod

# 3. Check logs
kubectl logs my-pod

# 4. Check previous container logs if crash looping
kubectl logs my-pod --previous

# 5. Check events in namespace
kubectl get events --sort-by='.lastTimestamp' | grep my-pod

# Execute commands in pod
kubectl exec -it my-pod -- sh
kubectl exec -it my-pod -c container-name -- bash

# Port forward to local machine
kubectl port-forward my-pod 8080:80

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

# Check service endpoints
kubectl get endpoints my-service

# Describe service
kubectl describe service my-service

# Test DNS resolution
kubectl run -it --rm debug --image=busybox --restart=Never -- nslookup my-service

# Check network policies
kubectl get networkpolicies

# Check resource usage
kubectl top nodes
kubectl top pods
kubectl top pods --containers

# Describe resource limits
kubectl describe pod my-pod | grep -A 5 Limits

# JSON output
kubectl get pod my-pod -o json

# YAML output
kubectl get pod my-pod -o yaml

# Custom columns
kubectl get pods -o custom-columns=NAME:.metadata.name,STATUS:.status.phase

# JSONPath
kubectl get pods -o jsonpath='{.items[*].metadata.name}'

# By label
kubectl get pods -l app=nginx
kubectl get pods -l 'env in (production,staging)'

# By field
kubectl get pods --field-selector status.phase=Running
kubectl get pods --field-selector metadata.namespace!=kube-system

# Watch for changes
kubectl get pods --watch
kubectl get pods -w

# Watch with timestamps
kubectl get pods --watch --output-watch-events