Import an AWS VPC using just the VPC ID. Public and Private subnets are imported dynamically using filtering.

dynamic-vpc-import.tf

variable "vpc_id" {
  type    = string
  default = "vpc-12345678"
}

data "aws_vpc" "vpc" {
  id = var.vpc_id
}

data "aws_subnet_ids" "public" {
  vpc_id = data.aws_vpc.vpc.id
  filter {
    name   = "tag:Name"
    values = ["*public*"]
  }
}

data "aws_subnet" "public" {
  for_each = data.aws_subnet_ids.public.ids
  id       = each.value
}

data "aws_subnet_ids" "private" {
  vpc_id = data.aws_vpc.vpc.id
  filter {
    name   = "tag:Name"
    values = ["*private*"]
  }
}

data "aws_subnet" "private" {
  for_each = data.aws_subnet_ids.private.ids
  id       = each.value
}

locals {
  private = [for i in data.aws_subnet.private : i]
}

output "private" {
  value = local.private[0].availability_zone
}