Kubernetes Command Reference

This guide provides a concise reference for common kubectl commands used to manage Kubernetes clusters. Whether you’re managing nodes, namespaces, pods, deployments, or autoscaling, the examples below will help you perform everyday tasks with confidence.

General Commands

List API Resources
Display all available API resources along with their short names:
```
kubectl api-resources
```

API Resources & Documentation

Get Detailed Documentation for an API Resource

kubectl explain <api-resource-name>

Example:

kubectl explain pod

kubectl explain pod.metadata

Applying YAML Files

Apply a Configuration from a YAML File

Apply a YAML configuration to a specific namespace:
```
kubectl apply -f <yaml-file> -n <namespace-name>
```

Viewing Cluster Resources

Display All Resources in a Namespace
```
kubectl get all -n <namespace-name>
```
Display ReplicaSets, Pods, and Deployments in a Specific Namespace
```
kubectl get rs,pods,deployments -n <namespace-name>
```

ReplicaSet & Deployment Management

Scaling and Rollouts

Scale a ReplicaSet

kubectl scale rs <replicaset-name> --replicas=<count> -n <namespace-name>

View Rollout History of a Deployment

kubectl rollout history deployment <deployment-name> -n <namespace-name>

View Details of a Specific Revision

kubectl rollout history deployment <deployment-name> -n <namespace-name> --revision=<number>

Roll Back a Deployment to a Specific Revision

kubectl rollout undo deployment <deployment-name> -n <namespace-name> --to-revision=<number>

Autoscaling

Autoscale a Deployment
Automatically scale a deployment based on CPU utilization:

kubectl autoscale deployment <deployment-name> -n <namespace-name> --cpu-percent=<target-cpu-percentage> --min=<min-pods> --max=<max-pods>

View Horizontal Pod Autoscalers (HPA)
```
kubectl get hpa -n <namespace-name>
```

Additional Information

Static Manifest Files
Any YAML files placed in /etc/kubernetes/manifests/ are automatically loaded when the kubelet starts (for example, after a server reboot).

kubectl cp -n <ns> <pod-name>:dir/ ./

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