如何将创建的子网转换为地图数据，供后续代码使用？

Question

首先，我创建了3个子网，我想将它们转换成地图形式，以便查找后面的代码。例如：

[0 = "${aws_subnet.subnet-1.id}" 
1 = "${aws_subnet.subnet-2.id}" 
2 = "${aws_subnet.subnet -3.id}"]

resource "aws_vpc" "module_vpc" {
  cidr_block       = "10.0.0.0/16"
  instance_tenancy = "default"
}

resource "aws_subnet" "subnet-1" {
  vpc_id     = "${aws_vpc.module_vpc.id}"
  cidr_block = "10.0.1.0/24"
}

resource "aws_subnet" "subnet-2" {
  vpc_id     = "${aws_vpc.module_vpc.id}"
  cidr_block = "10.0.2.0/24"
}

resource "aws_subnet" "subnet-3" {
  vpc_id     = "${aws_vpc.module_vpc.id}"
  cidr_block = "10.0.3.0/24"
}

以下是使用查找的代码

resource "aws_instance" "server" {
    count = 3
    subnet_id = "${lookup(var.subnets, count.index % 3)}"

}

我该怎么做？谢谢大家

Answer 1

基于list的可扩展性更强的另一种方式如何：

variable "subnet_cidrs" {
    default = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
}

resource "aws_vpc" "module_vpc" {
  cidr_block       = "10.0.0.0/16"
  instance_tenancy = "default"
}

resource "aws_subnet" "subnet" {
  count      = length(var.subnet_cidrs)
  vpc_id     = aws_vpc.module_vpc.id
  cidr_block = element(var.subnet_cidrs, count.index)
}

resource "aws_instance" "server" {
    count = 3    
    subnet_id = element(aws_subnet.subnet.*.id, count.index) # modulo is automatically applied
}

我假设terraform 0.12，因为您没有指定任何其他版本。