Professional Helm Chart Development Guide

Helm is the package manager for Kubernetes. However, a poorly written Helm chart can turn your project into spaghetti. Pay attention to these rules to write professional and maintainable charts:

1. Use _helpers.tpl

Avoid repetitive code. Define common templates for application naming (fullname, name) and labels in the _helpers.tpl file and use them everywhere (include "mychart.fullname" .).

2. Values.yaml Structure

Your values.yaml file should be hierarchical and readable.

• Bad: imageName: nginx, imageTag: 1.0
• Good:

  image:
    repository: nginx
    tag: 1.0
    pullPolicy: IfNotPresent
  

3. Resource Limits

Never provide hard-coded CPU/RAM limits. Make them parametric via values.yaml but definitely define default values (even if small).

4. Pod Disruption Budget (PDB)

Definitely add a PodDisruptionBudget template to your chart. This guarantees your application stays up (HA) during node updates.

5. Documentation (README.md)

Add a table, preferably automatically generated with helm-docs, explaining which parameters (Values) the person using your chart can change.

A good Helm chart reduces infrastructure setup time from days to hours in Kubernetes Consultancy projects.