Availability zones data source in Terraform - Mini Project: Build & Apply

Availability zones data source

📖 Scenario: You are setting up cloud infrastructure and need to find out which availability zones are available in your chosen region. This helps you plan where to deploy your resources for better reliability.

🎯 Goal: Use Terraform to fetch the list of availability zones in the current region and store them in a variable for later use.

📋 What You'll Learn

Use the aws_availability_zones data source to get availability zones

Create a variable called available_zones to store the list of zone names

💡 Why This Matters

🌍 Real World

Knowing available zones helps deploy resources in multiple places to avoid downtime.

💼 Career

Cloud engineers often need to query cloud provider data sources to automate infrastructure deployment.

1

Create AWS provider configuration

Write a Terraform block to configure the AWS provider with the region set to us-east-1.

Terraform

# Your code here

Need a hint?

Use provider "aws" block and set region = "us-east-1".

2

Add data source for availability zones

Add a Terraform data block named aws_availability_zones with the name available to fetch availability zones in the current region.

Terraform

provider "aws" {
  region = "us-east-1"
}

# Your code here

Need a hint?

Use data "aws_availability_zones" "available" and set state = "available" to get only available zones.

3

Create a local variable for zone names

Create a locals block with a variable called available_zones that extracts the list of zone names from data.aws_availability_zones.available.names.

Terraform

provider "aws" {
  region = "us-east-1"
}

data "aws_availability_zones" "available" {
  state = "available"
}

# Your code here

Need a hint?

Use locals block and assign available_zones = data.aws_availability_zones.available.names.

4

Output the availability zones

Add an output block named zones that outputs the local.available_zones list.

Terraform

provider "aws" {
  region = "us-east-1"
}

data "aws_availability_zones" "available" {
  state = "available"
}

locals {
  available_zones = data.aws_availability_zones.available.names
}

# Your code here

Need a hint?

Use output "zones" block and set value = local.available_zones.