Create Multiple Resources
Explore how to create multiple instances of the same Terraform resource using count, for_each, and splat operators. Understand how to apply loops and manage resource outputs for scalable infrastructure projects.
Overview
This lesson covers different aspects of creating multiple instances of the same resource in Terraform.
In it, we’ll go over the following concepts:
- The
countresource meta-argument.
-The splat ([*]) operator.
-
The
forloop in Terraform. -
The
for_eachresource meta-argument.
Importance
These techniques and keywords are essential for a firm understanding of Terraform. This is particularly true for systems and applications that need to scale their resources. For example, we might want to create 100 AWS EC2 instances, or loop over a list of usernames creating accounts for each.
Multiple VPCs
We’ve created the ltthw_multiple directory and the main.tf file. In the main.tf file, we’ve added provider and resource.
variable "region" {
type= string
}
provider "aws" {
region = var.region
}
resource "aws_vpc" "aws_vpc_count" {
count = 3
cidr_block = format("172.%d.0.0/16", 16 + count.index)
}The count meta-argument looks ...