I have created a vpc using module "vpc" , Please clarify how the variable private_subnets or public_subnets be assigned with Subnet ID after "apply" BUT my question is, in "resource" block these variables are assigned CIDR blocks.
module "vpc" {
source = "terraform-aws-modules/vpc/aws"
name = "my-vpc"
cidr = "10.0.0.0/16"
azs = ["eu-west-1a", "eu-west-1b", "eu-west-1c"]
private_subnets = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
public_subnets = ["10.0.101.0/24", "10.0.102.0/24", "10.0.103.0/24"]
enable_nat_gateway = true
enable_vpn_gateway = true
tags = {
Terraform = "true"
Environment = "dev"
}
}
CodePudding user response：
A module contains multiple resources and when you take a look at the code of the terraform-aws-modules/vpc/aws module you will see that the private_subnets and public_subnets are used to create aws_subnet resources:
resource "aws_subnet" "private" {
count = local.create_vpc && length(var.private_subnets) > 0 ? length(var.private_subnets) : 0
vpc_id = local.vpc_id
cidr_block = var.private_subnets[count.index]
}