"I don't understand, it literally works perfectly on my machine!"

Every developer has uttered this phrase. It usually happens right after a deployment brings down the staging environment, the QA team is angry, and you're sweating profusely trying to figure out why a TypeError is happening in the cloud when it ran flawlessly on your MacBook.

The "Works on My Machine" syndrome is a symptom of Configuration Drift. Here is how modern DevOps practices cure it permanently.

The Root Cause

Why does it work on your machine?