Create_before_destroy lifecycle rule in Terraform - Mini Project: Build & Apply

Create_before_destroy lifecycle rule

📖 Scenario: You are managing cloud infrastructure using Terraform. You want to update a resource safely without downtime by creating the new resource before destroying the old one.

🎯 Goal: Learn how to use the create_before_destroy lifecycle rule in Terraform to ensure resources are replaced safely.

📋 What You'll Learn

Create a Terraform resource block for an AWS S3 bucket named exactly my_bucket with bucket name my-unique-bucket-12345.

Add a lifecycle block with create_before_destroy = true inside the resource.

Use the exact resource type aws_s3_bucket and resource name my_bucket.

💡 Why This Matters

🌍 Real World

Using create_before_destroy helps avoid downtime when updating resources that cannot be replaced instantly, like S3 buckets or databases.

💼 Career

Cloud engineers and DevOps professionals use lifecycle rules in Terraform to manage infrastructure changes safely and reliably.

1

Create the AWS S3 bucket resource

Create a Terraform resource block named my_bucket of type aws_s3_bucket with the bucket name set to "my-unique-bucket-12345".

Terraform

# Create the aws_s3_bucket resource named my_bucket
# Your code here

Need a hint?

Use resource "aws_s3_bucket" "my_bucket" {} and set the bucket attribute inside.

2

Add the lifecycle block

Add a lifecycle block inside the my_bucket resource.

Terraform

resource "aws_s3_bucket" "my_bucket" {
  bucket = "my-unique-bucket-12345"
  # Add lifecycle block here
}

Need a hint?

Inside the resource block, add lifecycle { } on separate lines.

3

Set create_before_destroy to true

Inside the lifecycle block, add the line create_before_destroy = true.

Terraform

resource "aws_s3_bucket" "my_bucket" {
  bucket = "my-unique-bucket-12345"

  lifecycle {
    # Set create_before_destroy to true here
  }
}

Need a hint?

Inside the lifecycle block, write create_before_destroy = true exactly.

4

Complete the resource with lifecycle rule

Ensure the full resource block for my_bucket includes the bucket attribute and the lifecycle block with create_before_destroy = true.

Terraform

resource "aws_s3_bucket" "my_bucket" {
  bucket = "my-unique-bucket-12345"

  lifecycle {
    create_before_destroy = true
  }
  # Finalize resource block
}

Need a hint?

Check that the resource block is complete with all required parts.