Kubernetes

☸️ Kubernetes Cheat Sheet

📦 Cluster & Node Management

1. Get cluster info.

   kubectl cluster-info
   

2. List all nodes.

   kubectl get nodes
   

3. Get node details.

   kubectl describe node <node-name>
   

4. Mark a node as unschedulable.

   kubectl cordon <node-name>
   

5. Mark a node as schedulable.

   kubectl uncordon <node-name>
   

6. Evict all pods from a node.

   kubectl drain <node-name> --ignore-daemonsets
   

7. Taint a node.

   kubectl taint nodes <node-name> key=value:NoSchedule
   

8. Add a label to a node.

   kubectl label nodes <node-name> key=value
   

9. Display node labels.

   kubectl get nodes --show-labels
   

10. Delete a node from the cluster.

    kubectl delete node <node-name>
    

11. Get nodes with a specific label.

    kubectl get nodes --selector=env=prod
    

12. Assign a node role.

    kubectl label node <node-name> node-role.kubernetes.io/worker=
    

13. Forcefully drain a node.

    kubectl drain <node-name> --delete-local-data --force --ignore-daemonsets
    

14. Custom format output.

    kubectl get nodes -o custom-columns=NAME:.metadata.name,STATUS:.status.conditions.type
    

15. Display node resource usage efficiently.

    kubectl top nodes --use-protocol-buffers
    

16. List only node names.

    kubectl get nodes -o jsonpath='{.items[*].metadata.name}{"\n"}{end}'
    

17. Check node capacity.

    kubectl get nodes -o yaml | grep capacity
    

18. Get node taints.

    kubectl describe node <node-name> | grep Taint
    

19. Label a node.

    kubectl label node <node-name> disktype=ssd
    

20. Get nodes with a specific label.

    kubectl get nodes -l disktype=ssd
    

21. Drain a node and delete emptyDir volumes.

    kubectl drain <node-name> --ignore-daemonsets --delete-emptydir-data
    

22. Delete all nodes.

    kubectl get nodes --no-headers | awk '{print $1}' | xargs kubectl delete node
    

23. Get Kubelet version of nodes.

    kubectl get nodes -o jsonpath='{.items[*].status.nodeInfo.kubeletVersion}'
    

🥅 Pod Management

1. List all pods in the current namespace.

   kubectl get pods
   

2. List all pods in all namespaces.

   kubectl get pods -A
   

3. List pods with node details.

   kubectl get pods -o wide
   

4. Get pod details.

   kubectl describe pod <pod-name>
   

5. View logs of a pod.

   kubectl logs <pod-name>
   

6. View logs of a specific container.

   kubectl logs <pod-name> -c <container-name>
   

7. Access a running pod’s shell.

   kubectl exec -it <pod-name> -- /bin/sh
   

8. Delete a pod.

   kubectl delete pod <pod-name>
   

9. Force delete a pod.

   kubectl delete pod --force --grace-period=0 <pod-name>
   

10. Get pod YAML configuration.

    kubectl get pod <pod-name> -o yaml
    

11. Get pods by label.

    kubectl get pod --selector=env=prod
    

12. Add a label to a pod.

    kubectl label pod <pod-name> env=prod
    

13. Add an annotation.

    kubectl annotate pod <pod-name> description="Test pod"
    

14. List pods with a specific label.

    kubectl get pods -l app=myapp
    

15. Delete pods using a label selector.

    kubectl delete pods -l app=myapp
    

16. View logs from a previous container instance.

    kubectl logs --previous <pod-name>
    

17. Execute a command in a specific container.

    kubectl exec <pod-name> -c <container-name> -- ls /app
    

18. Copy a file from a pod.

    kubectl cp <pod-name>:<file-path> <destination>
    

19. Copy a file to a pod.

    kubectl cp <source-file> <pod-name>:<destination-path>
    

20. Sort pods by creation time.

    kubectl get pods --sort-by=.metadata.creationTimestamp
    

21. Force delete a pod immediately.

    kubectl delete pod <pod-name> --grace-period=0 --force
    

22. Get the IP address of a pod.

    kubectl get pod <pod-name> -o jsonpath='{.status.podIP}'
    

23. List only pod names.

    kubectl get pods -o jsonpath='{range .items[*]}{.metadata.name}{"\n"}{end}'
    

24. Get only running pods.

    kubectl get pods --field-selector=status.phase=Running
    

25. Get pod conditions.

    kubectl get pod <pod-name> -o jsonpath='{.status.conditions}'
    

26. Get container images inside a pod.

    kubectl get pod <pod-name> -o jsonpath='{.spec.containers[*].image}'
    

27. Patch container image.

    kubectl patch pod <pod-name> -p '{"spec":{"containers":[{"name":"<container-name>","image":"nginx:latest"}]}}'
    

28. Delete all pods.

    kubectl get pods --no-headers | awk '{print $1}' | xargs kubectl delete pod
    

29. Delete all failed pods.

    kubectl delete pod -n <namespace> --field-selector=status.phase=Failed
    

30. Delete failed pods.

    kubectl delete pod --field-selector=status.phase=Failed
    

🚀 Deployment Management

1. List all deployments.

   kubectl get deployments
   

2. Get deployment details.

   kubectl describe deployment <deployment-name>
   

3. Deploy resources from a YAML file.

   kubectl apply -f <deployment.yaml>
   

4. Create a simple deployment.

   kubectl create deployment <name> --image=<image>
   

5. Delete a deployment.

   kubectl delete deployment <deployment-name>
   

6. Check deployment rollout status.

   kubectl rollout status deployment <deployment-name>
   

7. View deployment history.

   kubectl rollout history deployment <deployment-name>
   

8. Rollback to a previous version.

   kubectl rollout undo deployment <deployment-name>
   

9. Get all ReplicaSets.

   kubectl get rs
   

10. Scale a deployment.

    kubectl scale deployment <deployment-name> --replicas=3
    

11. Restart all pods in a deployment.

    kubectl rollout restart deployment <deployment-name>
    

12. Show labels of deployments.

    kubectl get deployments --show-labels
    

13. Delete all deployments.

    kubectl delete deployment --all
    

14. Update container image in a deployment.

    kubectl patch deployment <deployment-name> -p '{"spec":{"template":{"spec":{"containers":[{"name":"<container-name>","image":"nginx:latest"}]}}}}'
    

15. Scale a deployment to zero.

    kubectl scale --replicas=0 deployment/<deployment-name>
    

16. Get deployment names only.

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

17. Update deployment image.

    kubectl set image deployment/<deployment-name> <container-name>=nginx:latest
    

18. Patch a resource.

    kubectl patch deployment <deployment-name> -p '{"spec":{"replicas":5}}'
    

19. Set resource requests/limits for a deployment.

    kubectl set resources deployment <deployment-name> --limits=cpu=200m,memory=512Mi --requests=cpu=100m,memory=256Mi
    

20. Patch deployment label.

    kubectl patch deployment <deployment-name> -p '{"spec":{"template":{"metadata":{"labels":{"version":"v2"}}}}}'
    

21. Pause a deployment rollout.

    kubectl rollout pause deployment <deployment-name>
    

22. Resume a paused deployment rollout.

    kubectl rollout resume deployment <deployment-name>
    

23. Annotate a deployment.

    kubectl annotate deployment <deployment-name> kubernetes.io/change-cause="Updated image to v2"
    

🌐 Services & Networking

1. List all services.

   kubectl get svc
   

2. List all services in all namespaces.

   kubectl get svc -A
   

3. Get service details.

   kubectl describe svc <service-name>
   

4. Delete a service.

   kubectl delete svc <service-name>
   

5. Expose a deployment as a service.

   kubectl expose deployment <deployment-name> --type=NodePort --port=80
   

6. List all service endpoints.

   kubectl get endpoints
   

7. Forward local port to a pod.

   kubectl port-forward pod/<pod-name> 8080:80
   

8. Start a proxy to access the API server.

   kubectl proxy
   

9. List service names.

   kubectl get services -o=jsonpath='{range .items[*]}{.metadata.name}{"\n"}{end}'
   

10. Delete all services.

    kubectl delete service --all
    

11. Change a service type.

    kubectl patch svc <service-name> -p '{"spec": {"type": "LoadBalancer"}}'
    

12. Get LoadBalancer IP.

    kubectl get svc <service-name> -o jsonpath='{.status.loadBalancer.ingress.ip}'
    

13. Get the NodePort of a service.

    kubectl get svc <service-name> -o yaml | grep nodePort
    

14. Change service port mapping.

    kubectl patch service <service-name> -p '{"spec":{"ports":[{"port":8080,"targetPort":80}]}}'
    

15. Forward a port to a deployment.

    kubectl port-forward deployment/<deployment-name> 8080:80
    

16. Get services sorted by creation date.

    kubectl get svc --sort-by=.metadata.creationTimestamp
    

🚦 Ingress & Load Balancer

1. List all ingress resources.

   kubectl get ingress
   

2. Get ingress details.

   kubectl describe ingress <ingress-name>
   

3. Delete an ingress resource.

   kubectl delete ingress <ingress-name>
   

4. Deploy an ingress rule.

   kubectl apply -f ingress.yaml
   

5. Get Ingress external IP.

   kubectl get ingress -o jsonpath='{.items[*].status.loadBalancer.ingress[*].ip}'
   

6. Get ingress names only.

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

7. List all ingress hosts.

   kubectl get ingress -o jsonpath='{range .items[*]}{.spec.rules[*].host}'
   

8. Edit an existing ingress rule.

   kubectl edit ingress <ingress-name>
   

9. Delete all ingress rules.

   kubectl delete ingress --all
   

⚙️ ConfigMaps & Secrets

1. List all ConfigMaps.

   kubectl get configmaps
   

2. Get ConfigMap details.

   kubectl describe configmap <configmap-name>
   

3. Create a ConfigMap.

   kubectl create configmap <config-name> --from-literal=key=value
   

4. Delete a ConfigMap.

   kubectl delete configmap <configmap-name>
   

5. List all secrets.

   kubectl get secrets
   

6. Get secret details.

   kubectl describe secret <secret-name>
   

7. Create a secret.

   kubectl create secret generic <secret-name> --from-literal=key=value
   

8. View ConfigMap in YAML format.

   kubectl get configmap <configmap-name> -o yaml
   

9. Decode secret value.

   kubectl get secret <secret-name> -o jsonpath='{.data.<key>}' | base64 --decode
   

10. Edit an existing ConfigMap.

    kubectl edit configmap <configmap-name>
    

🏳️‍🌈 Namespace Management

1. List all namespaces.

   kubectl get namespaces
   

2. Create a new namespace.

   kubectl create namespace <namespace>
   

3. Delete a namespace.

   kubectl delete namespace <namespace>
   

4. List pods in a specific namespace.

   kubectl get pods -n <namespace>
   

5. Set default namespace for the current context.

   kubectl config set-context --current --namespace=<namespace>
   

6. Force delete a namespace.

   kubectl delete namespace <namespace> --grace-period=0 --force
   

7. Get namespace names only.

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

💾 Persistent Storage

1. List all Persistent Volumes.

   kubectl get pv
   

2. List all Persistent Volume Claims.

   kubectl get pvc
   

3. Get PV details.

   kubectl describe pv <pv-name>
   

4. Get PVC details.

   kubectl describe pvc <pvc-name>
   

5. View PV details.

   kubectl get pv -o wide
   

6. List PVC names only.

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

🧰 StatefulSets & DaemonSets

1. List all StatefulSets.

   kubectl get statefulsets
   

2. Get StatefulSet details.

   kubectl describe statefulset <statefulset-name>
   

3. List all DaemonSets.

   kubectl get daemonsets
   

4. Get DaemonSet details.

   kubectl describe daemonset <daemonset-name>
   

5. Restart a DaemonSet.

   kubectl rollout restart daemonset <daemonset-name>
   

🐞 Events & Debugging

1. List all events.

   kubectl get events
   

2. Sort events by time.

   kubectl get events --sort-by=.metadata.creationTimestamp
   

3. Debug a running pod.

   kubectl debug pod/<pod-name> --image=busybox
   

🛡️ RBAC & Security

1. List all roles.

   kubectl get roles
   

2. List all role bindings.

   kubectl get rolebindings
   

3. Get role details.

   kubectl describe role <role-name>
   

4. List all cluster roles.

   kubectl get clusterroles
   

5. List all cluster role bindings.

   kubectl get clusterrolebindings
   

📊 Resource Management

1. View CPU & memory usage of nodes.

   kubectl top nodes
   

2. View CPU & memory usage of pods.

   kubectl top pods
   

3. Edit a live deployment.

   kubectl edit deployment <deployment-name>
   

4. View Kubeconfig settings.

   kubectl config view
   

5. List available Kubernetes contexts.

   kubectl config get-contexts
   

6. Switch to a different context.

   kubectl config use-context <context-name>
   

⎈ Helm

1. List all Helm releases.

   helm list
   

2. Install a Helm chart.

   helm install <name> <chart>
   

3. Upgrade a Helm release.

   helm upgrade <name> <chart>
   

4. Rollback a Helm release.

   helm rollback <name> <revision>
   

⏱️ Jobs & CronJobs

1. List all jobs.

   kubectl get jobs
   

2. Get job details.

   kubectl describe job <job-name>
   

3. Delete a job.

   kubectl delete job <job-name>
   

4. List all cron jobs.

   kubectl get cronjobs
   

5. Delete a cron job.

   kubectl delete cronjob <cronjob-name>
   

🛠️ Miscellaneous

1. Get documentation for pod resources.

   kubectl explain pod
   

2. Run a temporary pod.

   kubectl run --rm -it busybox -- /bin/sh
   

3. Test YAML before applying.

   kubectl apply --dry-run=client -f <file>.yaml
   

4. Delete all resources in the namespace.

   kubectl delete all --all
   

5. Delete all pods and services.

   kubectl delete pod,svc --all
   

6. Delete all jobs.

   kubectl delete jobs --all
   

7. Check component health.

   kubectl get componentstatus
   

8. View certificate signing requests.

   kubectl get csr
   

9. Drain a node with emptyDir cleanup.

   kubectl drain <node> --delete-emptydir-data
   

10. Run a debug container.

    kubectl run debug --image=busybox --restart=Never --rm -it -- /bin/sh
    

11. List all API resources.

    kubectl api-resources
    

12. Get details of API services.

    kubectl describe apiservices
    

13. Delete a CertificateSigningRequest.

    kubectl delete csr <csr-name>
    

14. Explain pod spec structure.

    kubectl explain pod.spec
    

15. Generate pod YAML.

    kubectl run nginx --image=nginx --restart=Never --dry-run=client -o yaml
    

16. Update an environment variable in a deployment.

    kubectl set env deployment/<deployment-name> CONFIG_VAR=value