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PublishedSeptember 28, 2026 at 08:09 AM

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version: "1.0.1" name: helm-charts user-invocable: false description: Use when understanding and creating Helm charts for packaging and deploying Kubernetes applications. allowed-tools: []

Helm Charts

Understanding and creating Helm charts for Kubernetes applications.

Chart Structure

mychart/
├── Chart.yaml          # Chart metadata
├── values.yaml         # Default values
├── charts/            # Chart dependencies
├── templates/         # Template files
│   ├── NOTES.txt     # Usage notes
│   ├── deployment.yaml
│   ├── service.yaml
│   ├── _helpers.tpl  # Template helpers
│   └── tests/        # Test files
└── .helmignore       # Files to ignore

Chart.yaml

yaml

apiVersion: v2
name: my-app
user-invocable: false
description: A Helm chart for my application
type: application
version: 1.0.0
appVersion: "1.0.0"
keywords:
  - web
  - api
maintainers:
  - name: Your Name
    email: you@example.com
dependencies:
  - name: postgresql
    version: "12.1.0"
    repository: "https://charts.bitnami.com/bitnami"
    condition: postgresql.enabled

values.yaml

yaml

replicaCount: 3
 
image:
  repository: myapp
  pullPolicy: IfNotPresent
  tag: "1.0.0"
 
service:
  type: ClusterIP
  port: 80
 
ingress:
  enabled: false
  className: "nginx"
  hosts:
    - host: myapp.local
      paths:
        - path: /
          pathType: Prefix
 
resources:
  limits:
    cpu: 500m
    memory: 512Mi
  requests:
    cpu: 250m
    memory: 256Mi
 
autoscaling:
  enabled: false
  minReplicas: 2
  maxReplicas: 10
  targetCPUUtilizationPercentage: 80

Common Commands

Create Chart

bash

helm create mychart

Install Chart

bash

# Install from directory
helm install myrelease ./mychart
 
# Install with custom values
helm install myrelease ./mychart -f custom-values.yaml
 
# Install with value overrides
helm install myrelease ./mychart --set image.tag=2.0.0

Upgrade Chart

bash

helm upgrade myrelease ./mychart
 
# Upgrade or install
helm upgrade --install myrelease ./mychart

Validate Chart

bash

# Lint chart
helm lint ./mychart
 
# Dry run
helm install myrelease ./mychart --dry-run --debug
 
# Template rendering
helm template myrelease ./mychart

Manage Releases

bash

# List releases
helm list
 
# Get release status
helm status myrelease
 
# Get release values
helm get values myrelease
 
# Rollback
helm rollback myrelease 1
 
# Uninstall
helm uninstall myrelease

Dependencies

Chart.yaml

yaml

dependencies:
  - name: redis
    version: "17.0.0"
    repository: "https://charts.bitnami.com/bitnami"
    condition: redis.enabled
    tags:
      - cache

Update Dependencies

bash

helm dependency update ./mychart
helm dependency build ./mychart
helm dependency list ./mychart

Chart Repositories

bash

# Add repository
helm repo add bitnami https://charts.bitnami.com/bitnami
 
# Update repositories
helm repo update
 
# Search charts
helm search repo nginx
 
# Search hub
helm search hub wordpress

Best Practices

Version Conventions

Chart version: Semantic versioning (1.2.3)
App version: Application version (v1.0.0)

Default Values

Provide sensible defaults in values.yaml:

yaml

# Good defaults
resources:
  limits:
    cpu: 100m
    memory: 128Mi
  requests:
    cpu: 100m
    memory: 128Mi
 
# Allow customization
config: {}
env: {}

Documentation

Include NOTES.txt for post-installation instructions:

Thank you for installing {{ .Chart.Name }}.
 
Your release is named {{ .Release.Name }}.
 
To learn more about the release, try:
 
  $ helm status {{ .Release.Name }}
  $ helm get all {{ .Release.Name }}

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