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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>
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Helm Charts
Schema Validation
- Always validate values against the chart schema before committing. Run
helm show values <repo>/<chart> --version <ver>to check the actual structure. - Helm chart schemas change between versions — field names and nesting can differ from documentation or online examples.
- A quick
helm templatetest locally catches schema errors before deployment. additionalProperties: falsein chart schemas means any extra keys at the wrong nesting level cause a hard failure.
Version Verification
- Run
helm search repoor check upstream docs to confirm latest stable versions - Don't rely on memory for chart versions — they go stale quickly
- Check compatibility matrices between chart version, app version, and other cluster components
Multi-Source Applications
- ArgoCD multi-source Applications use
$refsyntax to combine external Helm charts with Git-stored values files - Keep values files in Git alongside the ArgoCD Application manifest
Timeout Handling
- Under cluster pressure (many events, etcd busy), default Helm timeouts may not be enough
- Increase timeout for initial installs (e.g., 10m instead of 5m)
helm upgrade --installis idempotent — retries are safe