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ToanPV90
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kustomize-validator

Validate Kustomize configurations and render overlays for Kubernetes YAML issues.

Updated Apr 15, 2026
Search Tags:#validation#security-audit#kubernetes-manifests#kustomize#overlay-rendering#schema-checking#patch-linting
One-click install
npx skills add https://github.com/ToanPV90/dotfiles --skill kustomize-validator
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: kustomize-validator
Source: https://github.com/ToanPV90/dotfiles/tree/main/claude/.claude/skills/kustomize-validator
Command: npx skills add https://github.com/ToanPV90/dotfiles --skill kustomize-validator

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

It prevents broken Kubernetes deployments by finding Kustomize structure issues, render failures, schema errors, patch problems, and common security misconfigurations before you apply manifests.

Core Features & Use Cases

  • Kustomize structure validation: Checks every kustomization.yaml for required fields and deprecated keys, and verifies referenced files exist.
  • Overlay rendering + YAML sanity: Builds overlays with kustomize (or kubectl kustomize) and validates the rendered output with yamllint (with a yq fallback).
  • Schema + consistency + security checks: Runs kubeconform for rendered-manifest validation, verifies patch targets and collision risks, and evaluates a security checklist for Pod/Deployment templates.

Quick Start

Ask the AI to validate your overlays by running read-only Kustomize rendering, schema validation, and a security checklist across all environments in your overlays directory.

Frequently Asked Questions about kustomize-validator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I validate kustomization.yaml structure and prevent broken Kubernetes deployments?▼

You can validate Kustomize builds by checking kustomization.yaml for required fields and deprecated keys, verifying referenced files exist, and rendering overlays to catch structure issues before applying manifests.

How does overlay rendering and schema checking work for Kustomize configurations?▼

Overlay rendering builds overlays using kustomize or kubectl kustomize, then validates the rendered output with yamllint and kubeconform to check YAML sanity and Kubernetes schema compliance.

Can I use kubectl kustomize instead of kustomize to render overlays for validation?▼

Yes, the validation process supports tool fallbacks, allowing you to render overlays using either kustomize or kubectl kustomize depending on your environment setup.

What is the best way to audit Kubernetes manifests for security misconfigurations in Kustomize builds?▼

Security auditing evaluates a checklist against Pod and Deployment templates in the rendered manifests to identify common security misconfigurations before deployment.

Why does my Kustomize build fail with patch type mismatches and how can I validate patch targets?▼

Patch validation verifies patch targets and collision risks in rendered overlays, preventing patch and type mismatches that cause build failures.

Do I need kubeconform and yamllint installed to validate Kustomize overlays?▼

The validation process uses kubeconform for schema validation and yamllint for YAML sanity checking, with a yq fallback available if yamllint is not present.

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