# k8s-pulse Helm Chart

This Helm chart provides a production-ready Kubernetes deployment for **k8s-pulse**, a Python web application that visualizes cluster metrics and resource usage.

## Prerequisites

- A running Kubernetes cluster (v1.19+ recommended).
- [Helm v3](https://helm.sh/) installed.
- (Optional) Metrics Server installed in your cluster for detailed container CPU & memory usage.

## Quick Start

### 1. Install the Chart

To install the chart with default release name `k8s-pulse`:

```bash
helm install k8s-pulse ./helm-chart
```

### 2. Custom Configuration

You can override default settings by passing a custom `values.yaml` file or using `--set`:

```bash
helm install k8s-pulse ./helm-chart -f custom-values.yaml
```

Example: Enable Ingress and change image tag:

```bash
helm install k8s-pulse ./helm-chart \
  --set image.tag="1.0.0" \
  --set ingress.enabled=true \
  --set ingress.hosts[0].host="k8s-pulse.example.com"
```

### 3. Upgrade the Release

```bash
helm upgrade k8s-pulse ./helm-chart
```

### 4. Uninstall

```bash
helm uninstall k8s-pulse
```

## Configuration Parameters

| Parameter | Description | Default |
|-----------|-------------|---------|
| `replicaCount` | Number of application replicas | `1` |
| `image.repository` | Docker image repository | `k8s-pulse` |
| `image.tag` | Docker image tag | `latest` |
| `image.pullPolicy` | Image pull policy | `IfNotPresent` |
| `service.type` | Kubernetes service type | `ClusterIP` |
| `service.port` | Service port exposed | `80` |
| `service.targetPort` | Container application port | `5000` |
| `rbac.create` | Create ClusterRole & ClusterRoleBinding for K8s API access | `true` |
| `serviceAccount.create` | Create ServiceAccount for the deployment | `true` |
| `serviceAccount.name` | Explicit ServiceAccount name | `""` |
| `ingress.enabled` | Enable Ingress resource | `false` |
| `resources` | Pod CPU/Memory resource limits & requests | `{ limits: { cpu: 200m, memory: 256Mi }, requests: { cpu: 100m, memory: 128Mi } }` |
| `persistence.enabled` | Enable optional PersistentVolumeClaim | `false` |

## RBAC Requirements

`k8s-pulse` requires read access to cluster nodes, pods, and `metrics.k8s.io` custom objects. By default, `rbac.create: true` creates a `ClusterRole` and `ClusterRoleBinding` bound to the pod's `ServiceAccount`.

## Verification

Check the deployment status:

```bash
kubectl get pods -l app.kubernetes.io/name=k8s-pulse
kubectl get svc -l app.kubernetes.io/name=k8s-pulse
```