helm-chart-scaffolding

Design, organize, and manage Helm charts for templating and packaging Kubernetes applications with reusable configurations. Use when creating Helm charts, packaging Kubernetes applications, or implementing templated deployments.

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リポジトリ: oimiragieo/agent-studio
ソースの最終更新活動: 2026年4月21日 23:45
検出された SKILL.md の言語: 英語
スター: 36
フォーク: 6

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name	helm-chart-scaffolding
description	Design, organize, and manage Helm charts for templating and packaging Kubernetes applications with reusable configurations. Use when creating Helm charts, packaging Kubernetes applications, or implementing templated deployments.
version	1.0.0
model	sonnet
invoked_by	["devops"]
tools	["Read","Write","Edit","Bash","Glob","Grep"]
verified	false
lastVerifiedAt	"2026-02-19T05:29:09.098Z"
source	builtin
trust_score	100
provenance_sha	e86dfc4613a714f3

Helm Chart Scaffolding

Comprehensive guidance for creating, organizing, and managing Helm charts for packaging and deploying Kubernetes applications.

Purpose

This skill provides step-by-step instructions for building production-ready Helm charts, including chart structure, templating patterns, values management, and validation strategies.

When to Use This Skill

Use this skill when you need to:

Create new Helm charts from scratch
Package Kubernetes applications for distribution
Manage multi-environment deployments with Helm
Implement templating for reusable Kubernetes manifests
Set up Helm chart repositories
Follow Helm best practices and conventions

Helm Overview

Helm is the package manager for Kubernetes that:

Templates Kubernetes manifests for reusability
Manages application releases and rollbacks
Handles dependencies between charts
Provides version control for deployments
Simplifies configuration management across environments

Step-by-Step Workflow

1. Initialize Chart Structure

Create new chart:

helm create my-app

Standard chart structure:

my-app/
├── Chart.yaml           # Chart metadata
├── values.yaml          # Default configuration values
├── charts/              # Chart dependencies
├── templates/           # Kubernetes manifest templates
│   ├── NOTES.txt       # Post-install notes
│   ├── _helpers.tpl    # Template helpers
│   ├── deployment.yaml
│   ├── service.yaml
│   ├── ingress.yaml
│   ├── serviceaccount.yaml
│   ├── hpa.yaml
│   └── tests/
│       └── test-connection.yaml
└── .helmignore         # Files to ignore

2. Configure Chart.yaml

Chart metadata defines the package:

apiVersion: v2
name: my-app
description: A Helm chart for My Application
type: application
version:

# Image configuration
image:
  repository: myapp
  tag: '1.0.0'
  pullPolicy: IfNotPresent

# Number of replicas
replicaCount: 3

# Service configuration
service:
  type: ClusterIP
  port: 80
  targetPort: 8080

# Ingress configuration
ingress:
  enabled: false
  className: nginx
  hosts:
    - host: app.example.com
      paths:
        - path: /
          pathType: Prefix

# Resources
resources:
  requests:
    memory: '256Mi'
    cpu: '250m'
  limits:
    memory: '512Mi'
    cpu: '500m'

# Autoscaling
autoscaling:
  enabled: false
  minReplicas: 2
  maxReplicas: 10
  targetCPUUtilizationPercentage: 80

# Environment variables
env:
  - name: LOG_LEVEL
    value: 'info'

# ConfigMap data
configMap:
  data:
    APP_MODE: production

# Dependencies
postgresql:
  enabled: true
  auth:
    database: myapp
    username: myapp

redis:
  enabled: false

apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ include "my-app.fullname" . }}
  labels:
    {{- include "my-app.labels" . | nindent 4 }}
spec:
  {{- if not .Values.autoscaling.enabled }}
  replicas: {{ .Values.replicaCount }}
  {{- end }}
  selector:
    matchLabels:
      {{- include "my-app.selectorLabels" . | nindent 6 }}
  template:
    metadata:
      labels:
        {{- include "my-app.selectorLabels" . | nindent 8 }}
    spec:
      containers:
      - name: {{ .Chart.Name }}
        image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
        imagePullPolicy: {{ .Values.image.pullPolicy }}
        ports:
        - name: http
          containerPort: {{ .Values.service.targetPort }}
        resources:
          {{- toYaml .Values.resources | nindent 12 }}
        env:
          {{- toYaml .Values.env | nindent 12 }}

{{/*
Expand the name of the chart.
*/}}
{{- define "my-app.name" -}}
{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
{{- end }}

{{/*
Create a default fully qualified app name.
*/}}
{{- define "my-app.fullname" -}}
{{- if .Values.fullnameOverride }}
{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- $name := default .Chart.Name .Values.nameOverride }}
{{- if contains $name .Release.Name }}
{{- .Release.Name | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
{{- end }}
{{- end }}
{{- end }}

{{/*
Common labels
*/}}
{{- define "my-app.labels" -}}
helm.sh/chart: {{ include "my-app.chart" . }}
{{ include "my-app.selectorLabels" . }}
{{- if .Chart.AppVersion }}
app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
{{- end }}
app.kubernetes.io/managed-by: {{ .Release.Service }}
{{- end }}

{{/*
Selector labels
*/}}
{{- define "my-app.selectorLabels" -}}
app.kubernetes.io/name: {{ include "my-app.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end }}

dependencies:
  - name: postgresql
    version: '12.0.0'
    repository: 'https://charts.bitnami.com/bitnami'
    condition: postgresql.enabled

helm dependency update
helm dependency build

# values.yaml
postgresql:
  enabled: true
  auth:
    database: myapp
    username: myapp
    password: changeme
  primary:
    persistence:
      enabled: true
      size: 10Gi

# Lint the chart
helm lint my-app/

# Dry-run installation
helm install my-app ./my-app --dry-run --debug

# Template rendering
helm template my-app ./my-app

# Template with values
helm template my-app ./my-app -f values-prod.yaml

# Show computed values
helm show values ./my-app

#!/bin/bash
set -e

echo "Linting chart..."
helm lint .

echo "Testing template rendering..."
helm template test-release . --dry-run

echo "Checking for required values..."
helm template test-release . --validate

echo "All validations passed!"

helm package my-app/
# Creates: my-app-1.0.0.tgz

# Create index
helm repo index .

# Upload to repository
# AWS S3 example
aws s3 sync . s3://my-helm-charts/ --exclude "*" --include "*.tgz" --include "index.yaml"

helm repo add my-repo https://charts.example.com
helm repo update
helm install my-app my-repo/my-app

my-app/
├── values.yaml          # Defaults
├── values-dev.yaml      # Development
├── values-staging.yaml  # Staging
└── values-prod.yaml     # Production

replicaCount: 5

image:
  tag: '2.1.0'

resources:
  requests:
    memory: '512Mi'
    cpu: '500m'
  limits:
    memory: '1Gi'
    cpu: '1000m'

autoscaling:
  enabled: true
  minReplicas: 3
  maxReplicas: 20

ingress:
  enabled: true
  hosts:
    - host: app.example.com
      paths:
        - path: /
          pathType: Prefix

postgresql:
  enabled: true
  primary:
    persistence:
      size: 100Gi

helm install my-app ./my-app -f values-prod.yaml --namespace production

# templates/pre-install-job.yaml
apiVersion: batch/v1
kind: Job
metadata:
  name: {{ include "my-app.fullname" . }}-db-setup
  annotations:
    "helm.sh/hook": pre-install
    "helm.sh/hook-weight": "-5"
    "helm.sh/hook-delete-policy": hook-succeeded
spec:
  template:
    spec:
      containers:
      - name: db-setup
        image: postgres:15
        command: ["psql", "-c", "CREATE DATABASE myapp"]
      restartPolicy: Never

# templates/tests/test-connection.yaml
apiVersion: v1
kind: Pod
metadata:
  name: "{{ include "my-app.fullname" . }}-test-connection"
  annotations:
    "helm.sh/hook": test
spec:
  containers:
  - name: wget
    image: busybox
    command: ['wget']
    args: ['{{ include "my-app.fullname" . }}:{{ .Values.service.port }}']
  restartPolicy: Never

helm test my-app

{{- if .Values.ingress.enabled }}
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: {{ include "my-app.fullname" . }}
spec:
  # ...
{{- end }}

env:
{{- range .Values.env }}
- name: {{ .name }}
  value: {{ .value | quote }}
{{- end }}

data:
  config.yaml: |
    {{- .Files.Get "config/application.yaml" | nindent 4 }}

global:
  imageRegistry: docker.io
  imagePullSecrets:
    - name: regcred

# Use in templates:
image: {{ .Values.global.imageRegistry }}/{{ .Values.image.repository }}

helm template my-app ./my-app --debug

helm dependency update
helm dependency list

helm install my-app ./my-app --dry-run --debug
kubectl get events --sort-by='.lastTimestamp'

cat C:\dev\projects\agent-studio\.claude\context\memory\learnings.md