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Terraform Azurerm Set Diff Analyzer by gabeujin

Name: Terraform Azurerm Set Diff Analyzer
Author: Gabeujin

Terraform Azurerm Set Diff Analyzer

Analyze Terraform plan JSON output for AzureRM Provider to distinguish between false-positive diffs (order-only changes in Set-type attributes) and actual resource changes. Use when reviewing terraform plan output for Azure resources like Application Gateway, Load Balancer, Firewall, Front Door, NSG, and other resources with Set-type attributes that cause spurious diffs due to internal ordering changes.

Gabeujin Updated Sep 17, 2026

File contents

Terraform AzureRM Set Diff Analyzer

A skill to identify "false-positive diffs" in Terraform plans caused by AzureRM Provider's Set-type attributes and distinguish them from actual changes.

When to Use

terraform plan shows many changes, but you only added/removed a single element
Application Gateway, Load Balancer, NSG, etc. show "all elements changed"
You want to automatically filter false-positive diffs in CI/CD

Background

Terraform's Set type compares by position rather than by key, so when adding or removing elements, all elements appear as "changed". This is a general Terraform issue, but it's particularly noticeable with AzureRM resources that heavily use Set-type attributes like Application Gateway, Load Balancer, and NSG.

These "false-positive diffs" don't actually affect the resources, but they make reviewing terraform plan output difficult.

Prerequisites

Python 3.8+

If Python is unavailable, install via your package manager (e.g., apt install python3, brew install python3) or from python.org.

Basic Usage

# 1. Generate plan JSON output
terraform plan -out=plan.tfplan
terraform show -json plan.tfplan > plan.json

# 2. Analyze
python scripts/analyze_plan.py plan.json

Troubleshooting

python: command not found: Use python3 instead, or install Python
ModuleNotFoundError: Script uses only standard library; ensure Python 3.8+

Detailed Documentation

scripts/README.md - All options, output formats, exit codes, CI/CD examples
references/azurerm_set_attributes.md - Supported resources and attributes

---name: terraform-azurerm-set-diff-analyzerdescription: Analyze Terraform plan JSON output for AzureRM Provider to distinguish between false-positive diffs (order-only changes in Set-type attributes) and actual resource changes. Use when reviewing terraform plan output for Azure resources like Application Gateway, Load Balancer, Firewall, Front Door, NSG, and other resources with Set-type attributes that cause spurious diffs due to internal ordering changes.license: MIT---# Terraform AzureRM Set Diff AnalyzerA skill to identify "false-positive diffs" in Terraform plans caused by AzureRM Provider's Set-type attributes and distinguish them from actual changes.## When to Use- `terraform plan` shows many changes, but you only added/removed a single element- Application Gateway, Load Balancer, NSG, etc. show "all elements changed"- You want to automatically filter false-positive diffs in CI/CD## BackgroundTerraform's Set type compares by position rather than by key, so when adding or removing elements, all elements appear as "changed". This is a general Terraform issue, but it's particularly noticeable with AzureRM resources that heavily use Set-type attributes like Application Gateway, Load Balancer, and NSG.These "false-positive diffs" don't actually affect the resources, but they make reviewing terraform plan output difficult.## Prerequisites- Python 3.8+If Python is unavailable, install via your package manager (e.g., `apt install python3`, `brew install python3`) or from [python.org](https://www.python.org/downloads/).## Basic Usage```bash# 1. Generate plan JSON outputterraform plan -out=plan.tfplanterraform show -json plan.tfplan > plan.json# 2. Analyzepython scripts/analyze_plan.py plan.json```## Troubleshooting- **`python: command not found`**: Use `python3` instead, or install Python- **`ModuleNotFoundError`**: Script uses only standard library; ensure Python 3.8+## Detailed Documentation- [scripts/README.md](scripts/README.md) - All options, output formats, exit codes, CI/CD examples- [references/azurerm_set_attributes.md](references/azurerm_set_attributes.md) - Supported resources and attributes

Frequently asked questions