TerraForm创建简单的变量循环,以后可以使用

我是TerraForm开发的新手,尝试创建简单的变量循环,稍后可以使用,如下所示:

这对我非常有效,并按预期创建了两个子网。

variable "availability_zones" {
  description = "Available Availability Zones"
  type = "list"
  default = [ "us-east-1a", "us-east-1b" ]
}
variable "public_subnet_cidr" {
  description = "CIDR for Public Subnets"
  type = "list"
  default = [ "10.240.32.0/26", "10.240.32.64/26" ]

# Define Public Subnet
resource "aws_subnet" "public-subnets" {
  count = 2
  vpc_id = "${aws_vpc.default.id}"
  cidr_block = "${element(var.public_subnet_cidr, count.index)}"
  availability_zone = "${element(var.availability_zones, count.index)}"

  tags {
    Name = "${element(var.availability_zones, count.index)}_${element(var.public_subnet_cidr, count.index)}"
  }
}

但是,当尝试将这些子网与默认路由相关联时,我不知道如何从先前创建的子网中获取单个子网ID。最后是下面的代码。是否有方法获取单个子网的subnet.id?

# Assign Default Public Route Table to Public Subnet
resource "aws_route_table_association" "default_public_route" {
  subnet_id = "${aws_subnet.public-subnets.id}"     <<-- This is the line I am trying to figure out
  route_table_id = "${aws_route_table.default_public_route_table.id}"
}

事先谢谢。 山姆