Helm Template Render Notes: txt

Upon exploring a Helm chart, you might encounter a notes.txt file, particularly when rendering the templates. This file serves as a means for developers to provide essential information, warnings, or caveats about the chart or its usage. Let's delve into understanding and managing these notes.

Firstly, it's crucial to understand that the notes.txt file isn't processed by the Helm package manager itself but rather is a placeholder for human-readable information. It's typically placed in the chart's root directory and follows a simple text format with each note starting on a new line.

Understanding Notes.txt Format

The format is intuitive and easy to work with. Each note must be prefixed with a recognized keyword, followed by a colon, and then the note's text. Keywords are typically used to categorize the notes, such as NOTE, IMPORTANT, or DEPRECATED. For instance,

NOTE: This chart requires Kubernetes version 1.16 or later.
IMPORTANT: Ensure that the 'replicas' value is adjusted according to your needs.

Rendering Notes in Templates

To incorporate these notes into your templates, you can use the built-in: {{- include "note observes" . } template. This template does two primary tasks: it reads the notes.txt file and renders the notes it finds. Here's a basic example of how to use it:

{{- include "note observes" (dict "root" . "filename" "notes.txt") }}

`Creating and Updating Notes`

a computer screen with the text notpadd on it and an image of a keyboard

Using a simple text editor, you can create or update your notes.txt file. To add a new note, just append the note with its keyword to the file. For instance, to add a note about compatibility:

WARNING: This chart is not compatible with Helm 2.x

These notes are not only beneficial for your immediate team but also for users who might deploy your chart. They provide valuable context and best practices, gradually enhancing the chart's usability.

an image of a computer screen with the text file edit format view help on it

`Managing Notes in CI/CD Pipeline`

The management of notes.txt files can be integrated into a CI/CD pipeline, ensuring that the notes are version-controlled and consistent across various environments. Tools like Helm Unit can help validate the notes along with the chart's templates.

the top view of a computer screen with an empty space for text to be added

a black and white line drawing of a button with an arrow pointing to the left

three white papers with black dots on them against a black background stock photo - budget conscious

a piece of white paper with a blue ribbon on it and dots around the edge

an image of a white paper with black lines

These tools can check for the presence of required notes, inconsistencies, or deprecated notes, and even enforce specific stylistic rules on the notes, thereby ensuring a high standard of quality and usability across your charts.

`Use Cases and Best Practices`

notes.txt files are extremely versatile. Some common use-cases involve:


  Notifying users about necessary pod-security policies or required RBAC roles.
  Providing steps for post-installation configuration or teardown.
  Highlighting potential pitfalls or areas needing manual intervention.

Some best practices include:


  Keeping the notes concise but informative.
  Avoiding jargon, unless it's necessary and clearly defined.
  Regularly reviewing and updating the notes to maintain relevance.

In finality, the notes.txt file, though seemingly simple, plays a pivotal role in enhancing the user experience and promoting best practices when working with Helm charts. Don't overlook this powerful tool in your chart management process.