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.