使用 Terraform 在多个子网中创建 EC2 实例

Question

我目前在一个 VPC 中为一个区域内的每个可用区创建了多个子网。我现在尝试在每个可用区内为每个子网创建一个 EC2 实例，但遇到了问题。下面是我的代码，我在获取要附加到 EC2 实例的子网 ID 时遇到了一些问题。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.

Answer 1

实例代码应该如下：

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。