For_each 并计算在同一个 terraform AWS 资源中

Question

我正在尝试在 terraform 中迭代 route_tables 的列表来创建“aws_route”与另一项服务的 vpc_peering。 other service vpc destination_cidr_block是一个list.

variable "route_tables" {
  type        = set(string)
  description = "Set of route table entries eg : rt-1, rt-2 , rt-3"
}


variable "ext_service_destination_cidr_blocks"{
  type = list(string)
  description = "list of destination cidr blocks of external service, eg:[\"10.10.1.1/20\", \"10.2.10.1/10\"]"
}


resource "aws_route" "ext_service_route" {
 // iterating over route tables [ rt-1, rt-2 , rt-3 ]
  for_each = var.route_tables
  route_table_id = each.key

// Iterating over cidr list 
  count = var.ext_service_destination_cidr_blocks
  destination_cidr_block = var.ext_service_destination_cidr_blocks[count.index]
  vpc_peering_connection_id = var.ext_service_peering_connection_id
}

Here，我想遍历 destination_cidr_block 的列表。简单来说，我需要一个嵌套循环，count inside for_each。我不能在同一个块中同时使用 count 和 for_each，有什么解决方法吗？或者有什么办法可以把它分成两个模块？

Answer 1

我们可以使用 setproduct 来计算这两个集合的笛卡尔积，并以此为基础创建一个 map。这个map可以用来对它做for_each：

resource "aws_route" "ext_service_route" {
  for_each                  = { for i, pair in tolist(setproduct(var.route_tables, var.ext_service_destination_cidr_blocks)) : "route-${i}" => { "name" : pair[0], "cidr" : pair[1] } }
  route_table_id            = each.value.name
  destination_cidr_block    = each.value.cidr
  vpc_peering_connection_id = var.ext_service_peering_connection_id
}

For_each 并计算在同一个 terraform AWS 资源中

For_each and count in same terraform AWS resource

amazon-web-services

terraform

terraform-provider-aws