Added variable "source_db" for RDS replica option (#13)

main.tf

@@ -49,6 +49,8 @@ module "db_instance" {
   port                                = "${var.port}"
   iam_database_authentication_enabled = "${var.iam_database_authentication_enabled}"
 
+  replicate_source_db = "${var.replicate_source_db}"
+
   vpc_security_group_ids = ["${var.vpc_security_group_ids}"]
   db_subnet_group_name   = "${module.db_subnet_group.this_db_subnet_group_id}"
   parameter_group_name   = "${module.db_parameter_group.this_db_parameter_group_id}"

modules/db_instance/main.tf

@@ -19,6 +19,8 @@ resource "aws_db_instance" "this" {
   port                                = "${var.port}"
   iam_database_authentication_enabled = "${var.iam_database_authentication_enabled}"
 
+  replicate_source_db = "${var.replicate_source_db}"
+
   vpc_security_group_ids = ["${var.vpc_security_group_ids}"]
   db_subnet_group_name   = "${var.db_subnet_group_name}"
   parameter_group_name   = "${var.parameter_group_name}"

modules/db_instance/variables.tf

@@ -21,6 +21,11 @@ variable "kms_key_id" {
   default     = ""
 }
 
+variable "replicate_source_db" {
+  description = "Specifies that this resource is a Replicate database, and to use this value as the source database. This correlates to the identifier of another Amazon RDS Database to replicate."
+  default     = ""
+}
+
 variable "license_model" {
   description = "License model information for this DB instance. Optional, but required for some DB engines, i.e. Oracle SE1"
   default     = ""

variables.tf

@@ -21,6 +21,11 @@ variable "kms_key_id" {
   default     = ""
 }
 
+variable "replicate_source_db" {
+  description = "Specifies that this resource is a Replicate database, and to use this value as the source database. This correlates to the identifier of another Amazon RDS Database to replicate."
+  default     = ""
+}
+
 variable "license_model" {
   description = "License model information for this DB instance. Optional, but required for some DB engines, i.e. Oracle SE1"
   default     = ""