What is Helm?
Helm is the package manager for Kubernetes. A chart bundles templated manifests with configurable values, so you can install a whole application — and tune it per environment — without copy-pasting and hand-editing YAML.
Why it matters
Real deployments need the same manifests with different values for dev, staging, and production. Helm replaces brittle copies with one templated chart and a values file per environment. It is also how most third-party software ships for Kubernetes, so you will install charts constantly.
What to learn
- Charts, templates, and
values.yaml - Templating syntax and built-in functions
- Overriding values per environment
- Releases, upgrades, and rollbacks
- Chart dependencies
- Linting and templating before applying
- Finding and trusting community charts
Common pitfall
Over-templating until the chart is unreadable — every value parameterized "just in case," nested conditionals everywhere. A chart so abstract that nobody can follow it is worse than duplication. Template the values that actually change between environments, and keep the rest concrete.
Resources
Primary (free):
- Helm — Documentation · docs
- Helm — Chart template guide · docs
- Artifact Hub · tool
Practice
Turn the Deployment and Service you wrote into a small Helm chart with a
values.yaml controlling the image tag and replica count. Install it, override
the replica count for a "staging" values file, and upgrade. Roll back to the
previous release. Done when one chart serves two environments via values.
Outcomes
- Explain charts, templates, and values.
- Package Kubernetes manifests into a reusable chart.
- Override values per environment.
- Upgrade and roll back a release.