Kubernetes
Helm Charts for Kubernetes: Package and Deploy with Confidence
Helm is the package manager for Kubernetes. It lets you template your manifests, version your releases, and roll back deployments with a single command. Instead of managing dozens of raw YAML files, you define a chart with configurable values that can be customized per environment. Here is how to use Helm effectively in production.
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Chart Structure and Templating
A Helm chart is a directory containing `Chart.yaml` (metadata and version), `values.yaml` (default configuration), and a `templates/` folder with Go-templated Kubernetes manifests. The templating engine lets you inject values like replica count, image tag, and resource limits at install time. Use `{{ .Values.replicaCount }}` to reference values, `{{ include }}` to reuse named templates, and `{{ if }}` for conditional resources. Keep templates readable by extracting helper functions into `_helpers.tpl` rather than inlining complex logic.
Managing Values Across Environments
Create separate values files for each environment: `values-dev.yaml`, `values-staging.yaml`, `values-prod.yaml`. Override only what differs: image tags, replica counts, resource limits, and ingress hostnames. Install with `helm upgrade --install my-app ./chart -f values-prod.yaml`. This keeps your base chart generic while allowing per-environment customization. For secrets, use `helm-secrets` plugin with SOPS encryption so sensitive values can live in Git without exposure.
Chart Repositories and Versioning
Host your charts in a Helm repository using ChartMuseum, an OCI-compliant registry (Harbor, ECR, GCR), or a simple S3 bucket with the helm-s3 plugin. Version your charts semantically: bump the patch version for config changes, minor for new features, and major for breaking changes. Pin chart versions in your CI/CD pipeline so deployments are reproducible. Use `helm dependency update` to pull in sub-charts like Redis, PostgreSQL, or NGINX from public repositories.
Helm in CI/CD Pipelines
Integrate Helm into your deployment pipeline by running `helm upgrade --install` in your CI job. Use `--atomic` to automatically roll back if the deployment fails health checks, and `--wait` to block until all pods are ready. In GitHub Actions, the `azure/setup-helm` action installs Helm, and you can authenticate to your cluster with a kubeconfig stored as a repository secret. For GitOps workflows, tools like ArgoCD and Flux can watch a Git repository for chart changes and apply them automatically.
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