Helm Charts Explained: Beginner’s Guide
As Kubernetes becomes more popular, one of the first tools beginners encounter after learning the basics is Helm. If Kubernetes helps you manage containers, Helm helps you manage Kubernetes applications more efficiently.
Many people describe Helm as the package manager for Kubernetes, similar to how:
- APT works for Ubuntu
- YUM works for CentOS
- NPM works for Node.js
But what does that actually mean?
In this beginner-friendly guide, we will explain Helm Charts in simple language, cover why Helm exists, how it works, and how to use Helm to deploy applications quickly inside Kubernetes.
What Is Helm?
Helm is a package manager for Kubernetes that simplifies the deployment and management of Kubernetes applications.
Instead of manually writing long YAML configuration files for every deployment, service, secret, and ingress, Helm lets you package everything into reusable templates called Helm Charts.
Think of Helm as a shortcut that helps deploy complex applications with one command.
What Is a Helm Chart?
A Helm Chart is a packaged collection of Kubernetes YAML files.
It contains everything needed to deploy an application, such as:
- Deployments
- Services
- ConfigMaps
- Secrets
- Ingress Rules
- Persistent Volumes
In simple terms:
A Helm Chart is like an installation package for Kubernetes apps.
Why Helm Was Created
Managing Kubernetes manually becomes difficult because:
- YAML files get very long
- Repetitive configurations waste time
- Updating apps manually is messy
- Rollbacks are difficult
Helm solves all of this by making Kubernetes deployments:
- Faster
- Cleaner
- Easier to manage
- Reusable
Real-World Example of Helm
Imagine deploying WordPress manually.
Without Helm, you may need:
- 1 Deployment YAML
- 1 MySQL Deployment YAML
- 2 Services
- Persistent Volume config
- Secrets
- Ingress rules
That can mean 200+ lines of YAML.
With Helm:
helm install my-wordpress bitnami/wordpress
Done.
Helm Architecture Explained
Helm works using three main concepts:
1. Chart
Package containing Kubernetes templates.
2. Release
Running instance of a deployed chart.
3. Repository
Storage location for charts.
Helm 2 vs Helm 3
Older Helm versions used a component called Tiller.
Modern Helm 3:
- Removed Tiller
- Improved security
- Simpler architecture
Today everyone uses Helm 3.
Installing Helm
Install Helm on Linux:
curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
Verify installation:
helm version
Adding a Helm Repository
Repositories contain Helm Charts.
Example:
helm repo add bitnami https://charts.bitnami.com/bitnami
Update repo:
helm repo update
Searching for Helm Charts
Find available charts:
helm search repo wordpress
Example output:
- bitnami/wordpress
- bitnami/mysql
Installing an App Using Helm
Deploy WordPress:
helm install my-wordpress bitnami/wordpress
Helm automatically:
- Creates deployments
- Creates services
- Configures storage
Checking Installed Releases
Run:
helm list
Shows:
- Release names
- Namespace
- Status
Upgrading Helm Releases
Update deployed app:
helm upgrade my-wordpress bitnami/wordpress
Useful when:
- New version available
- Configuration changes needed
Rolling Back Changes
Undo update:
helm rollback my-wordpress 1
This restores previous version.
Uninstalling Helm Releases
Delete deployment:
helm uninstall my-wordpress
Helm Chart Directory Structure
A Helm Chart typically contains:
mychart/
Chart.yaml
values.yaml
templates/
What Is values.yaml?
This file stores customizable settings.
Example:
replicaCount: 2
image:
repository: nginx
Allows configuration without editing templates.
What Are Templates?
Templates use placeholders:
Example:
replicas: {{ .Values.replicaCount }}
Helm replaces placeholders dynamically.
Benefits of Helm
Faster Deployments
Deploy apps instantly.
Easy Updates
Upgrade with one command.
Reusable Templates
Avoid repeated YAML.
Better Team Collaboration
Standardized deployments.
Helm Best Practices
Use Version Control
Track chart changes.
Keep Values Separate
Use custom values files.
Test Before Production
Validate deployments.
Common Beginner Mistakes
Editing Generated YAML Directly
Wrong approach.
Forgetting Repo Update
May use outdated charts.
Hardcoding Values
Use values.yaml instead.
Helm vs kubectl
| Feature | Helm | kubectl |
|---|---|---|
| Deploy App | Easy | Manual |
| Rollback | Yes | Hard |
| Templates | Yes | No |
| Package Management | Yes | No |
When Should You Use Helm?
Use Helm when:
- Managing multiple apps
- Deploying production workloads
- Using Kubernetes often
- Automating deployments
FAQs
Is Helm required for Kubernetes?
No, but highly recommended.
Is Helm hard to learn?
No, easier than raw YAML.
Final Thoughts
Helm makes Kubernetes dramatically easier by simplifying application deployment, upgrades, and management. Once you start using Helm, you may never want to deploy raw YAML manually again.