3efe153ca1
Migrates 20 topic files from claude-foundations/best-practices/ to this standalone repo. Adds BESTPRACTICES.md index, CLAUDE.md conventions, and updated README.md. Container agents clone this repo to /best-practices. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
26 lines
1.2 KiB
Markdown
26 lines
1.2 KiB
Markdown
# Helm Charts
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## Schema Validation
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- **Always validate values against the chart schema before committing.** Run `helm show values <repo>/<chart> --version <ver>` to check the actual structure.
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- Helm chart schemas change between versions — field names and nesting can differ from documentation or online examples.
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- A quick `helm template` test locally catches schema errors before deployment.
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- `additionalProperties: false` in chart schemas means any extra keys at the wrong nesting level cause a hard failure.
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## Version Verification
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- Run `helm search repo` or check upstream docs to confirm latest stable versions
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- Don't rely on memory for chart versions — they go stale quickly
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- Check compatibility matrices between chart version, app version, and other cluster components
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## Multi-Source Applications
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- ArgoCD multi-source Applications use `$ref` syntax to combine external Helm charts with Git-stored values files
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- Keep values files in Git alongside the ArgoCD Application manifest
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## Timeout Handling
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- Under cluster pressure (many events, etcd busy), default Helm timeouts may not be enough
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- Increase timeout for initial installs (e.g., 10m instead of 5m)
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- `helm upgrade --install` is idempotent — retries are safe
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