如何在 terraform 中引用使用 for_each 创建的资源

Question

这就是我想要做的。我有 3 个 NAT 网关部署到不同的 AZ。我现在正在尝试为指向 NAT 网关的私有子网创建 1 个路由表。在 terraform 中，我使用 for_each 创建了 NAT 网关。我现在尝试将这些 NAT 网关与私有路由表相关联并收到错误，因为我使用 for_each 创建了 NAT 网关。本质上，我试图在不需要使用“for_each”的资源中引用使用 for_each 创建的资源。下面是代码和错误信息。任何建议将不胜感激。

resource "aws_route_table" "nat" {
  vpc_id = aws_vpc.main.id

  route {
    cidr_block     = "0.0.0.0/0"
    nat_gateway_id = aws_nat_gateway.main[each.key].id
  }

  tags = {
    Name = "${var.vpc_tags}_PrivRT"
  }
}

resource "aws_eip" "main" {
  for_each = aws_subnet.public
  vpc      = true

  lifecycle {
    create_before_destroy = true
  }
}

resource "aws_nat_gateway" "main" {
  for_each      = aws_subnet.public
  subnet_id     = each.value.id
  allocation_id = aws_eip.main[each.key].id
}

resource "aws_subnet" "public" {
  for_each                = var.pub_subnet
  vpc_id                  = aws_vpc.main.id
  cidr_block              = cidrsubnet(aws_vpc.main.cidr_block, 8, each.value)
  availability_zone       = each.key
  map_public_ip_on_launch = true
  tags = {
    Name = "PubSub-${each.key}"
  }
}

错误

Error: Reference to "each" in context without for_each



on vpc.tf line 89, in resource "aws_route_table" "nat":
  89:     nat_gateway_id = aws_nat_gateway.main[each.key].id

The "each" object can be used only in "resource" blocks, and only when the
"for_each" argument is set.

Answer 1

问题是您在"aws_route_table" "nat" 资源的nat_gateway_id 属性中引用each.key，而在该资源或子块中的任何位置都没有for_each。

为该资源添加一个 for_each 就可以了：

这是一些示例代码（未经测试）：

resource "aws_route_table" "nat" {
  for_each = var.pub_subnet

  vpc_id = aws_vpc.main.id

  route {
      cidr_block     = "0.0.0.0/0"
      nat_gateway_id = aws_nat_gateway.main[each.key].id
  }
}