[Docs][KubeRay] Add doc for kubectl plugin (ray-project#47851)

Signed-off-by: Chi-Sheng Liu <chishengliu@chishengliu.com>
Signed-off-by: mohitjain2504 <mohit.jain@dream11.com>

doc/source/cluster/kubernetes/user-guides.md

@@ -25,6 +25,7 @@ user-guides/helm-chart-rbac
 user-guides/tls
 user-guides/k8s-autoscaler
 user-guides/static-ray-cluster-without-kuberay
+user-guides/kubectl-plugin
 ```
 
 
@@ -53,3 +54,4 @@ at the {ref}`introductory guide <kuberay-quickstart>` first.
 * {ref}`kuberay-gke-bucket`
 * {ref}`ray-k8s-autoscaler-comparison`
 * {ref}`deploy-a-static-ray-cluster-without-kuberay`
+* {ref}`kubectl-plugin`

doc/source/cluster/kubernetes/user-guides/kubectl-plugin.md

@@ -0,0 +1,68 @@
+(kubectl-plugin)=
+
+# Use kubectl Plugin (alpha)
+
+Starting from KubeRay v1.2.2, you can use the `kubectl ray` plugin to simplify common workflows when deploying Ray on Kubernetes. If you aren't familiar with Kubernetes, this plugin simplifies running Ray on Kubernetes.
+
+## Installation
+
+See [KubeRay kubectl Plugin](https://github.com/ray-project/kuberay/tree/master/kubectl-plugin) to install the plugin.
+
+Install the Kuberay kubectl plugin using one of the following methods:
+
+- Install using Krew kubectl plugin manager (recommended)
+- Download from GitHub releases
+
+### Install using the Krew kubectl plugin manager (recommended)
+
+1. Install [Krew](https://krew.sigs.k8s.io/docs/user-guide/setup/install/).
+2. Download the plugin list by running `kubectl krew update`.
+3. Install the plugin by running `kubectl krew install ray`.
+4. Run `kubectl ray --help` to verify the installation.
+
+### Download from GitHub releases
+
+Go to the [releases page](https://github.com/ray-project/kuberay/releases) and download the binary for your platform.
+
+For example, to install kubectl plugin version 1.2.2 on Linux amd64:
+
+```bash
+curl -LO https://github.com/ray-project/kuberay/releases/download/v1.2.2/kubectl-ray_v1.2.2_linux_amd64.tar.gz
+tar -xvf kubectl-ray_v1.2.2_linux_amd64.tar.gz
+cp kubectl-ray ~/.local/bin
+```
+
+Replace `~/.local/bin` with the directory in your `PATH`.
+
+## Usage
+
+After installing the plugin, you can use `kubectl ray --help` to see the available commands and options.
+
+## Example
+
+This example assumes you have a Ray cluster running on Kubernetes. See {ref}`RayCluster Quickstart <kuberay-raycluster-quickstart>` if you don't have a Ray cluster running on Kubernetes.
+
+### Forward local ports to Ray cluster
+
+```shell
+$ kubectl ray session ray-cluster-kuberay
+
+Forwarding ports to service ray-cluster-kuberay-head-svc
+Ray Dashboard: http://localhost:8265
+Ray Interactive Client: http://localhost:10001
+
+Forwarding from 127.0.0.1:8265 -> 8265
+Forwarding from [::1]:8265 -> 8265
+Forwarding from 127.0.0.1:10001 -> 10001
+Forwarding from [::1]:10001 -> 10001
+```
+
+### Get Ray cluster logs
+
+```shell
+$ kubectl ray logs rayjob-sample-raycluster-kfhl6
+No output directory specified, creating dir under current directory using cluster name.
+Command set to retrieve both head and worker node logs.
+Downloading log for Ray Node rayjob-sample-raycluster-kfhl6-head-87xpb
+Downloading log for Ray Node rayjob-sample-raycluster-kfhl6-small-group-worker-54qfm
+```