Terraform Map of List input variables-For_each

user_11355865 0
Viewed 1930

I am trying to implement for_each for map of list input variables.

What the output should be is a list of subnets should be created for AZ us-east-1a(3 subnets) and us-east-1b (2 subnets).

Need your help for the below:

MAIN.TF

resource "aws_vpc" "name" {
  cidr_block = "192.168.0.0/16"
}

resource "aws_subnet" "name" {
  for_each = var.subnetcidr
  vpc_id = aws_vpc.name.id
  availability_zone = each.key
  cidr_block = toset(each.value) //need help here
}

TFVARS FILE

subnetcidr = {
  "us-east-1a" = ["192.168.1.0/24","192.168.2.0/24","192.168.0.0/24"]
  "us-east-1b" = ["192.168.3.0/24","192.168.4.0/24"]
}

Error:

Error: Incorrect attribute value type

  on main.tf line 28, in resource "aws_subnet" "name":
  28:   cidr_block = toset(each.value)
    |----------------
    | each.value is tuple with 2 elements

Inappropriate value for attribute "cidr_block": string required.

Any help would be appreciated. TIA!

terraform-provider-aws terraform foreach
2 Answers

The error seems clear:
Inappropriate value for attribute "cidr_block": string required
Not sure why you are passing a list...

If you need to keep it as a list, an option could be getting the first value:

resource "aws_vpc" "name" {
  cidr_block = "192.168.0.0/16"
}

resource "aws_subnet" "name" {
  for_each = var.subnetcidr
  vpc_id = aws_vpc.name.id
  availability_zone = each.key
  cidr_block = element(each.value, 0)
}

If you can change the subnetcidr variable, go with something like:

subnetcidr = {  
  "192.168.0.0/24" = "us-east-1a"
  "192.168.1.0/24" = "us-east-1a"
  "192.168.2.0/24" = "us-east-1a"

  "192.168.3.0/24" = "us-east-1b"
  "192.168.4.0/24" = "us-east-1b"
}

As you can see now the unique cidr blocks are the keys and the zones are the values.
Then in your code we do like this:

resource "aws_vpc" "name" {
  cidr_block = "192.168.0.0/16"
}

resource "aws_subnet" "name" {
  for_each = var.subnetcidr
  vpc_id = aws_vpc.name.id
  availability_zone = each.value
  cidr_block = each.key
}
user_75998330

I was finally able to solve this. Below is how.

resource "aws_vpc" "name" {

cidr_block = "10.0.0.0/16"

}

resource "aws_subnet" "name" {

vpc_id = aws_vpc.name.id

for_each = transpose(var.subnet)

availability_zone = each.value[0]

cidr_block = each.key

}

variable subnet {}

subnet = {

"us-east-1a" = ["10.0.0.0/20","10.0.16.0/20","10.0.32.0/20"]

"us-east-1b" = ["10.0.64.0/20","10.0.80.0/20"]

"us-east-1d" = ["10.0.112.0/20","10.0.128.0/20","10.0.144.0/20","10.0.96.0/20"]

}

user_113558650
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