ytt

name	ytt
description	Use this skill when the user wants to template YAML files, patch Kubernetes configurations, or work with structured YAML templating.

ytt Plugin

YAML templating tool that works on YAML structure instead of text. Template and patch YAML configurations with a powerful overlay mechanism.

Commands

Template Rendering

• ytt template render — Render YAML templates

Configuration Patching

• ytt config patch — Patch YAML configurations

Utility

• ytt _ _ — Passthrough to ytt CLI

Usage Examples

• "Template YAML files"
• "Patch Kubernetes config"
• "Render YAML templates"
• "Apply YAML overlays"

Installation

brew install ytt

Examples

# Render templates
ytt template render ./templates/

# With data values
ytt template render ./templates/ --data-values-file values.yaml

# Patch configurations
ytt config patch ./base.yaml ./overlay.yaml

# Output as JSON
ytt template render ./templates/ --output json

# Any ytt command with passthrough
ytt _ _ -f ./templates/
ytt _ _ -f ./config.yaml -f ./overlay.yaml

Key Features

• Structure - Works on YAML structure
• Templates - Powerful templating
• Overlays - Overlay mechanism
• Starlark - Starlark language
• Data values - External data values
• Functions - Custom functions
• Kubernetes - K8s configs
• Library - Reusable libraries
• Patching - Config patching
• Accurate - Text-safe editing

Notes

• Part of Carvel suite
• Works on structure not text
• Great for K8s configs
• Supports reusable libraries