Amazon web services 在多个子网中创建EC2实例，每个子网使用Terraform

我目前在VPC内为一个区域内的每个可用性区域创建了多个子网。我现在正试图在每个可用性区域内为每个子网创建一个EC2实例，但遇到了一个问题。下面是我的代码，我在获取要附加到EC2实例的子网ID时遇到一些问题。如有任何建议，将不胜感激

实例

resource "aws_instance" "public" {
  for_each      = aws_subnet.public
  ami           = data.aws_ami.ec2.id
  instance_type = var.tableau_instance
  key_name      = aws_key_pair.main.key_name
  subnet_id     = [for subnet in aws_subnet.public : subnet.id]
}

子网

locals {
  az_names = data.aws_availability_zones.azs.names
}

resource "aws_subnet" "public" {
  for_each                = { for index, az_name in local.az_names : index => az_name }
  vpc_id                  = aws_vpc.main.id
  cidr_block              = cidrsubnet(var.vpc_cidr, 8, each.key + 1)
  availability_zone       = local.az_names[each.key]
  map_public_ip_on_launch = true
  tags = {
    Name = "${var.vpc_tags}_PubSubnet"
  }
}

错误

Error: Incorrect attribute value type

  on vpc.tf line 18, in resource "aws_instance" "public":
  18:   subnet_id     = [for subnet in aws_subnet.public : subnet.id]
    |----------------
    | aws_subnet.public is object with 3 attributes

Inappropriate value for attribute "subnet_id": string required.

---

实例代码应如下所示：

resource "aws_instance" "public" {
  for_each      = aws_subnet.public
  ami           = data.aws_ami.ec2.id
  instance_type = var.tableau_instance
  key_name      = aws_key_pair.main.key_name
  subnet_id     = each.value.id
}

这将在每个子网中放置1个实例