Initial

Chart.yaml

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+# Chart.yaml
+apiVersion: v2
+name: basic-app
+description: A basic Helm chart for Kubernetes
+type: application
+version: 0.1.0
+appVersion: "1.0.0"

README.md

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+# Basic Application Helm Chart
+
+## Overview
+This Helm chart deploys a basic application on a Kubernetes cluster with the following components:
+- A deployment with configurable replicas
+- A persistent volume claim for data storage
+- A service for internal communication
+- An ingress for external access with TLS support
+
+## Prerequisites
+- Kubernetes 1.19+
+- Helm 3.0+
+- PV provisioner support in the underlying infrastructure
+- Ingress controller (e.g., nginx-ingress)
+
+## Installation
+
+### Add the repository
+```bash
+# If hosted in a Helm repository
+helm repo add my-repo https://charts.example.com
+helm repo update
+```
+
+### Install the chart
+```bash
+# Using default values
+helm install my-release .
+
+# Using custom values file
+helm install my-release . -f values.yaml
+
+# Using --set
+helm install my-release . --set ingress.hosts[0].host=example.com
+```
+
+## Uninstallation
+```bash
+helm uninstall my-release
+```
+
+## Configuration
+
+The following table lists the configurable parameters of the chart and their default values.
+
+| Parameter | Description | Default |
+|-----------|-------------|---------|
+| `replicaCount` | Number of replicas | `1` |
+| `image.repository` | Image repository | `nginx` |
+| `image.tag` | Image tag | `latest` |
+| `image.pullPolicy` | Image pull policy | `IfNotPresent` |
+| `service.type` | Kubernetes service type | `ClusterIP` |
+| `service.port` | Kubernetes service port | `80` |
+| `ingress.enabled` | Enable ingress | `true` |
+| `ingress.className` | Ingress class name | `nginx` |
+| `ingress.annotations` | Ingress annotations | `{}` |
+| `ingress.hosts[0].host` | Hostname | `chart-example.local` |
+| `ingress.hosts[0].paths[0].path` | Path | `/` |
+| `ingress.hosts[0].paths[0].pathType` | Path type | `Prefix` |
+| `ingress.tls.enabled` | Enable TLS | `true` |
+| `ingress.tls.secretName` | TLS secret name | `chart-example-tls` |
+| `persistence.enabled` | Enable persistence | `true` |
+| `persistence.accessMode` | PVC access mode | `ReadWriteOnce` |
+| `persistence.size` | PVC size | `1Gi` |
+| `persistence.storageClass` | PVC storage class | `""` |
+
+### Ingress Annotations Examples
+
+For NGINX ingress controller:
+```yaml
+ingress:
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    nginx.ingress.kubernetes.io/ssl-redirect: "true"
+```
+
+For cert-manager SSL certificates:
+```yaml
+ingress:
+  annotations:
+    cert-manager.io/cluster-issuer: "letsencrypt-prod"
+```
+
+## TLS Configuration
+
+To use TLS, create a TLS secret in the namespace:
+
+```bash
+kubectl create secret tls chart-example-tls \
+  --cert=path/to/tls.cert \
+  --key=path/to/tls.key
+```
+
+Then enable it in values.yaml:
+```yaml
+ingress:
+  tls:
+    enabled: true
+    secretName: chart-example-tls
+    hosts:
+      - chart-example.local
+```
+
+## Persistence
+
+The chart mounts a Persistent Volume at `/data`. The volume is created using dynamic volume provisioning.
+
+## Upgrading
+
+```bash
+# Upgrade using values file
+helm upgrade my-release . -f values.yaml
+
+# Upgrade with --set flag
+helm upgrade my-release . --set replicaCount=3
+```
+
+## Limitations
+- The chart has been tested on Kubernetes 1.19+
+- Persistent volume provisioning support in underlying infrastructure
+- Ingress controller must be present in the cluster
+
+## Contributing
+If you find any issues with this chart or want to contribute improvements:
+1. Fork the repository
+2. Create a new branch for your changes
+3. Submit a pull request
+
+## License
+This Helm chart is licensed under the MIT License.

templates/_helpers.tpl

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+{/*
+Common labels
+*/}}
+{{- define "basic-app.labels" -}}
+helm.sh/chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+app.kubernetes.io/name: {{ .Chart.Name }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "basic-app.selectorLabels" -}}
+app.kubernetes.io/name: {{ .Chart.Name }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}

templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    {{- include "basic-app.labels" . | nindent 4 }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      {{- include "basic-app.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      labels:
+        {{- include "basic-app.selectorLabels" . | nindent 8 }}
+    spec:
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - containerPort: 80
+              protocol: TCP
+          volumeMounts:
+            - name: data
+              mountPath: /data
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: {{ .Release.Name }}-pvc
+

templates/ingress.yaml

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+{{- if .Values.ingress.enabled -}}
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    {{- include "basic-app.labels" . | nindent 4 }}
+  {{- with .Values.ingress.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  ingressClassName: {{ .Values.ingress.className }}
+  {{- if and .Values.ingress.tls .Values.ingress.tls.enabled }}
+  tls:
+    - hosts:
+        {{- range .Values.ingress.tls.hosts }}
+        - {{ . | quote }}
+        {{- end }}
+      secretName: {{ .Values.ingress.tls.secretName }}
+  {{- end }}
+  rules:
+    {{- range .Values.ingress.hosts }}
+    - host: {{ .host | quote }}
+      http:
+        paths:
+          {{- range .paths }}
+          - path: {{ .path }}
+            pathType: {{ .pathType }}
+            backend:
+              service:
+                name: {{ $.Release.Name }}
+                port:
+                  number: {{ $.Values.service.port }}
+          {{- end }}
+    {{- end }}
+{{- end }}
+

templates/pvc.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ .Release.Name }}-pvc
+  labels:
+    {{- include "basic-app.labels" . | nindent 4 }}
+spec:
+  accessModes:
+    - {{ .Values.persistence.accessMode }}
+  resources:
+    requests:
+      storage: {{ .Values.persistence.size }}
+  {{- if .Values.persistence.storageClass }}
+  storageClassName: {{ .Values.persistence.storageClass }}
+  {{- end }}

templates/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    {{- include "basic-app.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: 80
+      protocol: TCP
+      name: http
+  selector:
+    {{- include "basic-app.selectorLabels" . | nindent 4 }}
+

values.yaml

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+replicaCount: 1
+
+image:
+  repository: nginx
+  pullPolicy: IfNotPresent
+  tag: "latest"
+
+service:
+  type: ClusterIP
+  port: 80
+
+ingress:
+  enabled: true
+  className: nginx
+  hosts:
+    - host: chart-example.local
+      paths:
+        - path: /
+          pathType: Prefix
+
+persistence:
+  enabled: true
+  accessMode: ReadWriteOnce
+  size: 1Gi
+  storageClass: ""
+
+
+ingress:
+  tls:
+    enabled: true
+    secretName: chart-example-tls
+    hosts:
+      - chart-example.local
+  annotations: {}
+    # kubernetes.io/ingress.class: nginx
+    # kubernetes.io/tls-acme: "true"
+    # cert-manager.io/cluster-issuer: "letsencrypt-prod"