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Helm is the package manager for Kubernetes, enabling you to define, install, and upgrade complex Kubernetes applications using reusable charts.

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Installing Helm

1

Add Helm GPG Key

Download and add the Helm signing key to your system:
curl https://baltocdn.com/helm/signing.asc | gpg --dearmor | sudo tee /usr/share/keyrings/helm.gpg > /dev/null
2

Add Helm Repository

Configure the Helm APT repository:
sudo apt-get install apt-transport-https --yes
echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/helm.gpg] https://baltocdn.com/helm/stable/debian/ all main" | sudo tee /etc/apt/sources.list.d/helm-stable-debian.list
3

Install Helm

Update package lists and install Helm:
sudo apt-get update -y
sudo apt-get install helm -y
4

Verify Installation

Check that Helm is installed correctly:
helm version

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Basic Helm Commands

helm repo add <repo-name> <repo-url>
helm repo update

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Installing Applications with Helm

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Example: Prometheus Stack

# Add Prometheus community repository
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo update

# Create namespace
kubectl create ns monitoring

# Install Prometheus stack
helm install prometheus --namespace monitoring prometheus-community/kube-prometheus-stack

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Using Custom Values

Create a custom values file to override default settings: 
# Generate default values
helm show values <chart-name> > custom-values.yaml

# Edit the file
vim custom-values.yaml

# Install with custom values
helm install <release-name> <chart-name> -f custom-values.yaml
Always review the default values before installing a chart to understand available configuration options.

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Helm Template

Generate Kubernetes manifests from a chart without installing: 
helm template <release-name> <chart-name> > manifests.yaml
This is useful for:
  • Reviewing what will be deployed
  • Creating custom manifests
  • CI/CD pipelines
  • GitOps workflows

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Best Practices

Always specify chart versions in production to ensure reproducible deployments:
helm install myapp repo/chart --version 1.2.3
Create namespaces explicitly before installing charts:
kubectl create namespace <namespace>
helm install <release> <chart> -n <namespace>
Maintain separate values files for different environments:
helm install myapp chart/ -f values-prod.yaml
helm install myapp chart/ -f values-dev.yaml
Be careful when upgrading Helm releases in production. Always test upgrades in a staging environment first and consider using helm diff plugin to preview changes.

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