Added support for DB instance identifier (#2)

* Added support for DB instance identifier

* Added var for controlling IAM DB authentication

Author: kmackowick

README.md

@@ -29,6 +29,8 @@ Create a postgres RDS instance
 | create\_ssm\_secret | True to create a SSM Parameter SecretString containing DB password | `bool` | `false` | no |
 | engine | Which RDS Engine to use | `string` | `"postgres"` | no |
 | engine\_version | Version of database engine to use | `string` | `"11.5"` | no |
+| iam\_db\_auth | True to enable IAM DB authentication | `bool` | `false` | no |
+| identifier | Identifier for DB Instance | `string` | n/a | yes |
 | instance\_class | What instance size to use | `string` | `"db.t3.small"` | no |
 | multi\_az | whether to make database multi-az | `string` | `true` | no |
 | name | common name for resources in this module | `string` | `"postgres-rds"` | no |

main.tf

@@ -16,7 +16,8 @@ resource "aws_db_instance" "this" {
   deletion_protection                 = true
   engine                              = var.engine
   engine_version                      = var.engine_version
-  iam_database_authentication_enabled = true
+  iam_database_authentication_enabled = var.iam_db_auth
+  identifier                          = var.identifier
   instance_class                      = var.instance_class
   multi_az                            = var.multi_az
   name                                = var.name

variables.tf

@@ -52,6 +52,17 @@ variable "engine_version" {
   type        = string
 }
 
+variable "iam_db_auth" {
+  default     = false
+  description = "True to enable IAM DB authentication"
+  type        = bool
+}
+
+variable "identifier" {
+  description = "Identifier for DB Instance"
+  type        = string
+}
+
 variable "instance_class" {
   default     = "db.t3.small"
   description = "What instance size to use"