为何众多官方Helm Chart在Values.yaml中含凭证且不支持现有Secret？

Great question—this is a common point of confusion, especially for folks focused on production security. Let me break down the reasoning behind this design choice, which boils down to balancing usability, compatibility, and ecosystem expectations:

• Out-of-the-box usability for new users
  A huge chunk of Helm Chart users are either testing deployments, learning Kubernetes, or need a quick way to spin up services without pre-configuring infrastructure. Including credential fields directly in values.yaml lets them fill in a few values and run helm install immediately, no prior Secret creation required. For projects like Bitnami, which prioritize "one-click deployment" as a core feature, this lowers the entry barrier significantly.

• Default configuration as a fallback (not a mandate)
  Most of these charts do support using existing Secrets—you just might not have noticed the parameters! For example, Bitnami’s popular charts (like MySQL, Redis, or WordPress) all include auth.existingSecret (or similar) fields that let you reference a pre-created Secret instead of using the plaintext values. The plaintext fields are there as a default for users who don’t need (or know about) the advanced secret management options.

• Historical ecosystem context
  When many of these charts were first developed, Helm’s ecosystem was less mature, and secret management best practices weren’t as universally adopted. Early designs prioritized getting users up and running quickly over strict security defaults, and while most charts have since added existing Secret support, the plaintext fields remain for backward compatibility.

• Explicit security warnings in documentation
  If you check the official docs for these charts, you’ll almost always find prominent warnings advising against using plaintext credentials in production. The maintainers aren’t ignoring best practices—they’re making a deliberate choice to cater to both novice users (who need simplicity) and production users (who can leverage the existing Secret options).

• Flexibility across deployment scenarios
  Not all environments have centralized secret managers or pre-provisioned Secrets. By including both options, the charts adapt to everything from local testing (where plaintext is acceptable) to enterprise production (where existing Secrets are mandatory). It’s a compromise that covers more use cases than forcing a single secret management approach.

As a best practice, always use the existingSecret parameters (or similar) for production deployments, and avoid committing plaintext values.yaml files to version control. Most charts even let you inject individual secret keys into the deployment if you don’t want to use the default Secret structure.

内容的提问来源于stack exchange，提问作者Sobiaholic