amazon-web-services - 具有动态内容的 Terraform 动态 block

Question

我正在尝试为 aws_route_table 创建一个 terraform 模块，这里是这个资源定义的一个例子:

resource "aws_route_table" "example" {
  vpc_id = aws_vpc.example.id

  route {
    cidr_block = "10.0.1.0/24"
    gateway_id = aws_internet_gateway.example.id
  }

  route {
    ipv6_cidr_block        = "::/0"
    egress_only_gateway_id = aws_egress_only_internet_gateway.example.id
  }

  tags = {
    Name = "example"
  }
}

我正在尝试通过使用动态 block 使其更具动态性。问题是我总是必须在内容 block 中定义键

resource "aws_route_table" "example" {
...

   dynamic "route" {
        for_each = var.route
        content {
            cidr_block  = route.value.cidr_block  
            gateway_id  = route.value.gateway_id  
        }
    }

...
}

所以在这种情况下，我需要编写两个动态 block ，一个用于包含 cidr_block 和 gateway_id 的内容，一个用于包含 ipv6_cidr_block< 的内容 和 egress_only_gateway_id。

有没有办法在不显式定义键的情况下做到这一点。像这样:

   dynamic "route" {
        for_each = var.route
        content {
          var.route.map
        }
    }

Answer 1

是的，您可以动态创建route，因为 block route 充当Attributes as Blocks .所以你可以做(​​例子)

# define all your routes in a variable (example content)

variable "routes" {

  default = [
    {
      cidr_block = "0.0.0.0/0"
      gateway_id = "igw-0377483faa64bf010"
    },
    {
      cidr_block = "172.31.0.0/20"
      instance_id = "i-043fc97db72ad1b59"     
    }
  ]
}


# need to provide default values (null) for all possibilities
# in route

locals {

  routes_helper = [
      for route in var.routes: merge({
          carrier_gateway_id = null
          destination_prefix_list_id = null
          egress_only_gateway_id = null 
          ipv6_cidr_block = null 
          local_gateway_id = null
          nat_gateway_id = null
          network_interface_id = null
          transit_gateway_id = null 
          vpc_endpoint_id = null 
          instance_id = null
          gateway_id = null
          vpc_peering_connection_id = null
      }, route)
    ]

}


resource "aws_route_table" "example" {
  vpc_id = aws_vpc.example.id

  # route can be attribute, instead of blocks
  route = local.routes_helper

  tags = {
    Name = "example"
  }
}

文档一般不建议使用它，但我认为路由是一个很好的例子，它可以接受。