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1.what_is_helm_in_k8s.md

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Helm is a package manager for Kubernetes, allowing users to easily manage, share, and deploy applications on Kubernetes clusters using pre-configured packages called charts. It simplifies the process of managing complex applications by providing versioning, templating, and release management capabilities.

Helm 2 Architecture

helm2

Helm 3 Architecture

Helm client interacts directly with kubernetes api-server

helm3

Why we need helm charts?

helm-need

  • Standardise and Reusable
  • Reduces deployment complexity
  • Improves developer productivity
  • The helm install command is used to deploy a Helm chart onto a Kubernetes cluster.It takes a Helm chart package (either a .tgz file or a chart reference) and installs it onto the cluster, generating Kubernetes resources based on the templates provided within the chart.
  • In Helm, the _helpers.tpl file is a special template file used to define reusable template helpers. These helpers are pieces of Go template code that can be used across multiple templates within a Helm chart.

Example_Chart_directory


mychart/
  Chart.yaml         # Metadata about the chart
  values.yaml        # Default configuration values
  charts/            # Directory containing dependencies (sub-charts)
  templates/         # Directory containing Kubernetes manifests
    deployment.yaml  # Example Kubernetes Deployment manifest
    service.yaml     # Example Kubernetes Service manifest
  charts/            # Directory containing dependencies (sub-charts)
  _helpers.tpl       # Optional: Template helpers
  ...

Helm Workflow

helm_workflow