example ebs mapper

deploy/main.tf

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+provider "aws" {
+  version = "~> 2.0"
+  region  = "us-east-2"
+}
+
+module "servers" {
+  source = "../test"
+  num_instances = 2
+  enable_mysql = false
+  enable_mongo = true
+  #mongo_disk_size = [300,100,100]
+}
+

module/main.tf

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+variable "ebs_kms_key" { default = null}
+
+variable "mongo_disk_size_default" { default = 100}
+variable "mongo_disk_size" { default = null}
+
+variable "mongo_disk_type_default" { default = 100}
+variable "mongo_disk_type" { default = null}
+
+variable "mongo_disk_encryption" { default = null}
+variable "mongo_disk_kms_key" { default = null}
+
+variable "mongo_mount_default" { default = "mongo"}
+variable "mongo_device_name" { default = "/dev/sdh"}
+
+variable "mysql_disk_size" { default = null}
+variable "ifs_disk_size" { default = null}
+
+variable "num_instances" { default = 2}
+variable "enable_mysql" { default = false}
+variable "enable_mongo" { default = false}
+variable "enable_ifs" { default = false}
+
+provider "aws" {
+  version = "~> 2.0"
+  region  = "us-east-2"
+}
+
+resource "aws_instance" "test" {
+  count = var.num_instances
+  ami           = "ami-05c1fa8df71875112"
+  instance_type = "t2.micro"
+  availability_zone = "us-east-2a"
+  tags = {
+    Name = "test${count.index}"
+    Count = count.index
+  }
+}
+
+resource "aws_ebs_volume" "mongo" {
+  count = var.enable_mongo == true ? var.num_instances : 0
+  availability_zone = "us-east-2a"
+  size =  var.mongo_disk_size != null ? var.mongo_disk_size : var.mongo_disk_size_default
+  encrypted = var.mongo_disk_encryption != null ? var.mongo_disk_size[count.index] : true
+  type = var.mongo_disk_type != null ? var.mongo_disk_size[count.index] : var.mongo_disk_type_default
+  kms_key_id = var.mongo_disk_kms_key != null ? var.mongo_disk_kms_key : var.ebs_kms_key
+  tags = {
+    Name = "Mongo${count.index}"
+    Count = count.index
+    Mount = "mongo"
+  }
+}
+
+resource "aws_volume_attachment" "mongo_att" {
+  count = var.enable_mongo == true ? var.num_instances : 0
+  device_name = var.mongo_device_name
+  volume_id   = aws_ebs_volume.mongo[count.index].id
+  instance_id = aws_instance.test[count.index].id
+}