Cheat Sheet #day16 - kubectl Commands

kubectl Commands Cheat Sheet

kubectl is the command-line tool for interacting with Kubernetes clusters. This cheat sheet covers the most commonly used kubectl commands to help manage and troubleshoot Kubernetes clusters.

Cluster Information

• Check kubectl Version:

    kubectl version --client
  

• Display Cluster Info:

    kubectl cluster-info
  

• List Nodes:

    kubectl get nodes
  

• Describe a Node:

    kubectl describe node NODE_NAME
  

Namespaces

• List Namespaces:

    kubectl get namespaces
  

• Create a Namespace:

    kubectl create namespace NAMESPACE_NAME
  

• Delete a Namespace:

    kubectl delete namespace NAMESPACE_NAME
  

Pods

• List Pods:

    kubectl get pods
  

• List Pods in All Namespaces:

    kubectl get pods --all-namespaces
  

• Describe a Pod:

    kubectl describe pod POD_NAME
  

• Get Pod Logs:

    kubectl logs POD_NAME
  

• Execute a Command in a Pod:

    kubectl exec -it POD_NAME -- COMMAND
  

• Create a Pod from a YAML File:

    kubectl apply -f pod.yaml
  

• Delete a Pod:

    kubectl delete pod POD_NAME
  

Deployments

• List Deployments:

    kubectl get deployments
  

• Describe a Deployment:

    kubectl describe deployment DEPLOYMENT_NAME
  

• Scale a Deployment:

    kubectl scale deployment DEPLOYMENT_NAME --replicas=NUMBER_OF_REPLICAS
  

• Update a Deployment:

    kubectl set image deployment/DEPLOYMENT_NAME CONTAINER_NAME=IMAGE:TAG
  

• Roll Back a Deployment:

    kubectl rollout undo deployment/DEPLOYMENT_NAME
  

• Get Deployment Status:

    kubectl rollout status deployment/DEPLOYMENT_NAME
  

Services

• List Services:

    kubectl get services
  

• Describe a Service:

    kubectl describe service SERVICE_NAME
  

• Expose a Deployment as a Service:

    kubectl expose deployment DEPLOYMENT_NAME --type=LoadBalancer --name=SERVICE_NAME
  

• Delete a Service:

    kubectl delete service SERVICE_NAME
  

ConfigMaps and Secrets

• List ConfigMaps:

    kubectl get configmaps
  

• Create a ConfigMap from a File:

    kubectl create configmap CONFIGMAP_NAME --from-file=FILE_PATH
  

• Describe a ConfigMap:

    kubectl describe configmap CONFIGMAP_NAME
  

• Delete a ConfigMap:

    kubectl delete configmap CONFIGMAP_NAME
  

• List Secrets:

    kubectl get secrets
  

• Create a Secret from Literal:

    kubectl create secret generic SECRET_NAME --from-literal=key1=value1 --from-literal=key2=value2
  

• Describe a Secret:

    kubectl describe secret SECRET_NAME
  

• Delete a Secret:

    kubectl delete secret SECRET_NAME
  

Persistent Volumes and Claims

• List Persistent Volumes:

    kubectl get pv
  

• Describe a Persistent Volume:

    kubectl describe pv PV_NAME
  

• List Persistent Volume Claims:

    kubectl get pvc
  

• Describe a Persistent Volume Claim:

    kubectl describe pvc PVC_NAME
  

Config Management

• Apply a Configuration:

    kubectl apply -f config.yaml
  

• Delete a Resource from a Configuration File:

    kubectl delete -f config.yaml
  

• Diff Current State with Configuration File:

    kubectl diff -f config.yaml
  

Resource Status

• Get Resource Status:

    kubectl get RESOURCE_TYPE RESOURCE_NAME
  

• Describe Resource:

    kubectl describe RESOURCE_TYPE RESOURCE_NAME
  

Troubleshooting

• View Events:

    kubectl get events
  

• Debug a Resource:

    kubectl describe RESOURCE_TYPE RESOURCE_NAME
  

• Check Cluster Components Status:

    kubectl get componentstatuses
  

• Get Logs for a Pod:

    kubectl logs POD_NAME
  

• Follow Logs for a Pod:

    kubectl logs -f POD_NAME
  

Cleaning Up

• Delete a Resource:

    kubectl delete RESOURCE_TYPE RESOURCE_NAME
  

• Delete All Pods in a Namespace:

    kubectl delete pods --all -n NAMESPACE_NAME
  

• Delete All Resources in a Namespace:

    kubectl delete all --all -n NAMESPACE_NAME
  

Conclusion

This cheat sheet provides a quick reference to the most commonly used kubectl commands. For more detailed information and advanced usage, refer to the official Kubernetes documentation.