Get VPC information and subnets

Posted on 26-Mar-2022

Get Default VPC and Public Subnets

data "aws_vpc" "default" {
  default = true
}

data "aws_subnets" "all" {
  filter {
    name   = "vpc-id"
    values = [data.aws_vpc.default.id]
  }
}

output "first_subnet_id" {
	value = sort(data.aws_subnets.all.ids)[0]
}

Get custom VPC with Public/Private subnets

locals {
	vpc_name = "myvpc"
}

data "aws_vpc" "vpc" {
  filter {
    name   = "tag:Name"
    values = [local.vpc_name]
  }
}

data "aws_subnets" "public" {
  filter {
    name   = "vpc-id"
    values = [data.aws_vpc.vpc.id]
  }

  filter {
    name   = "tag:Name"
    values = ["${local.vpc_name}-public-*"]
  }
}

data "aws_subnets" "private" {
  filter {
    name   = "vpc-id"
    values = [data.aws_vpc.vpc.id]
  }

  filter {
    name   = "tag:Name"
    values = ["${local.vpc_name}-private-*"]
  }
}