Kubernetes Cheat Sheet

kubectl Basics

kubectl getList resources
kubectl describeShow details
kubectl createCreate resource
kubectl applyApply config
kubectl deleteDelete resource
kubectl editEdit resource

Pod Commands

kubectl get podsList pods
kubectl logsView logs
kubectl exec -itExecute command
kubectl port-forwardForward port
kubectl cpCopy files
kubectl top podsResource usage

Deployment Commands

kubectl rollout statusRollout status
kubectl rollout historyHistory
kubectl rollout undoRollback
kubectl scaleScale replicas
kubectl set imageUpdate image

Resource Types

pods (po)Pod
deployments (deploy)Deployment
services (svc)Service
configmaps (cm)ConfigMap
secretsSecret
ingress (ing)Ingress
nodes (no)Node

Deployment YAML

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-app
        image: my-app:1.0
        ports:
        - containerPort: 8080
          

Service YAML

apiVersion: v1
kind: Service
metadata:
  name: my-app-svc
spec:
  type: ClusterIP        # ClusterIP, NodePort, LoadBalancer
  selector:
    app: my-app
  ports:
  - port: 80
    targetPort: 8080
          

Config & Secrets

kubectl create cmCreate ConfigMap
kubectl create secretCreate Secret
--from-fileFrom file
--from-literalFrom key=value
--from-env-fileFrom .env file

Debugging

kubectl logs -fFollow logs
kubectl logs --previousPrevious logs
kubectl describe podPod events
kubectl get eventsCluster events
kubectl debugDebug pod

Common Commands

# Get all resources in namespace
kubectl get all -n my-namespace

# Apply all YAML files in directory
kubectl apply -f ./manifests/

# Scale deployment
kubectl scale deployment/my-app --replicas=5

# Update image
kubectl set image deployment/my-app my-app=my-app:2.0

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

# Execute shell in pod
kubectl exec -it my-pod -- /bin/sh
          

Output Formats

-o wideMore columns
-o yamlYAML output
-o jsonJSON output
-o nameNames only
--watchWatch changes

Context & Namespace

kubectl config get-contextsList contexts
kubectl config use-contextSwitch context
-n namespaceSpecify namespace
--all-namespacesAll namespaces