Template engine

As explained in Acing the Certified Kubernetes Administrator Exam, Second Edition

A template engine is software that generates configuration or other output by substituting values into a parameterized template.

A template engine generates configuration or other output by substituting values into a parameterized template. In Kubernetes, Helm uses templated YAML to package and install applications without rebuilding every manifest manually. section 5.3.1

Use the engine operationally to:

• Package multiple YAML manifests as a Helm chart that controls application installation. section 5.3.1
• Provide deployment-specific values through a values file instead of editing each manifest. section 5.3.1
• Install charts from public or private repositories using the cluster's kubeconfig. section 5.3.1

Installing a chart with values

Add a repository, search for a chart, and install it with customized values: helm repo add metallb https://metallb.github.io/metallb; helm search repo metallb; helm install metallb metallb/metallb --values values.yaml. Verify the result with helm ls and its deployed status. section 5.3.1

Figure 5.19 How to create a values file and apply values to Helm for a pod manifest

Compare a values file with the Helm command that applies those values to a pod manifest. section 5.3.1

How Acing the Certified Kubernetes Administrator Exam, Second Edition covers it

How deep it goes

Explains packaging, repositories, values files, installation, and verification, but does not detail template syntax internals.

Examples

Uses pod manifests, MetalLB values, Helm repositories, helm search repo, helm install, and helm ls.

What it assumes

Assumes Kubernetes YAML and kubeconfig usage while treating Helm installation and chart retrieval as operational steps.

What you can do after

Operate Helm to add repositories, search charts, install values, and verify deployed releases.

How it connects

Connects template engines with Helm charts, YAML manifests, values files, package repositories, and kubeconfig.

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  Spring in Action, Sixth EditionA view template library is a software library that processes templates to generate rendered web views.

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Related concepts

• Teraincludes · Tera is a Rust template-engine library for generating text output, including HTML, from templates and supplied data.
• Thymeleafincludes · Thymeleaf is a Java server-side template engine for generating HTML, markup, and other text-based documents from templates and model data.
• librarykind of · A software library is a reusable collection of code or components that other programs can incorporate or invoke to provide functionality.
• server-side renderingused by · A web-rendering technique in which a server generates a user interface’s markup or other rendered representation before delivering it to a client.
• HTMLproduces · HTML (HyperText Markup Language) is the standard markup language for structuring content and elements in web documents.
• TEMPLATES settingconfigured by · The TEMPLATES setting is the Django settings configuration that selects template engines and controls where template files are searched for.

This explainer was generated by Manning's knowledge graph from the text of Acing the Certified Kubernetes Administrator Exam, Second Edition. The section links point to the parts of the book it draws on.