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