Terraform Keeps Replacing Resources? The Hidden for_each Expression Problem (Identity vs Logic)

Terraform replaces resources even when nothing “important” changed.
The root cause is usually not Terraform. It’s how expressions are shaping resource identity.

This lesson breaks down why for_each keys define Terraform state addresses and how inline expression logic can silently mutate those keys. When identity depends on fallback logic, formatting, or conditionals, Terraform plans a destroy and recreate because it sees a different object.

What this solves:
Unexpected resource replacement during plan due to unstable for_each keys

What you’ll learn:

why for_each keys define resource identity in state
how expression logic can silently change identity
why inline recovery functions create unpredictable plans
how to separate normalization from resource definition
how to design stable identity to prevent unnecessary replacement

Why this matters:
State identity controls lifecycle behavior. If identity is unstable, Terraform cannot track objects correctly, which leads to unintended destroy and recreate operations.

Terraform concepts:
for_each, state address, expression evaluation, identity design, normalization, validation boundary

Lesson 98

Disclaimer:
Terraform is a trademark of HashiCorp, Inc.
This video is for educational purposes only and is not affiliated with, endorsed by, or sponsored by HashiCorp.
The views and opinions expressed are my own and do not represent those of my employer.
Use of Terraform or any infrastructure tooling may result in charges from service providers.

Видео Terraform Keeps Replacing Resources? The Hidden for_each Expression Problem (Identity vs Logic) канала Fierem