Why Plan and apply separation in pipelines in Terraform? - Purpose & Use Cases

The Big Idea

What if you could see all cloud changes before they happen and avoid costly mistakes?

The Scenario

Imagine you are managing your cloud setup by running all commands directly on your computer or server. You try to update your infrastructure by typing commands one by one, mixing planning and applying changes without clear steps.

The Problem

This manual way is slow and risky. You might apply changes before knowing their impact, causing unexpected errors or downtime. It's easy to forget steps or apply changes in the wrong order, leading to confusion and mistakes.

The Solution

Using separate pipeline stages for planning and applying changes helps you see what will happen before making any real updates. This clear separation makes your process safer, more predictable, and easier to manage.

Before vs After

✗ Before

terraform apply

✓ After

terraform plan
terraform apply

What It Enables

This approach lets you catch problems early and confidently update your cloud setup without surprises.

Real Life Example

Think of it like checking a recipe before cooking. Planning is reading the recipe and gathering ingredients, applying is actually cooking the meal. Separating these steps avoids mistakes and wasted effort.

Key Takeaways

Manual cloud updates can cause errors and downtime.

Separating plan and apply steps makes changes safer and clearer.

This method helps catch issues before they affect your system.