如何在Terraform中引用用for_each创建的资源

如何解决如何在Terraform中引用用for_each创建的资源

这就是我想要做的。我将3个NAT网关部署到单独的可用区中。我现在正在尝试为指向NAT网关的专用子网创建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网关与专用路由表相关联，并收到错误消息，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。下面是代码和错误消息。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.

解决方法

问题是您正在引用each.key资源的nat_gateway_id 属性中的"aws_route_table" "nat"，而该资源或子块中的任何地方都没有for_each。

向该资源添加一个for_each，这应该可以解决问题：

以下是一些示例代码（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
  }
}