Feature/rds cluster resource id output (#31)

* Added the Resource ID to outputs.

* Updated with information for using this_rds_cluster_resource_id output parameter.

* Updated the example with a sample policy using this new output parameter.

README.md

@@ -114,6 +114,7 @@ Terraform documentation is generated automatically using [pre-commit hooks](http
 | this\_rds\_cluster\_database\_name | Name for an automatically created database on cluster creation |
 | this\_rds\_cluster\_endpoint | The cluster endpoint |
 | this\_rds\_cluster\_id | The ID of the cluster |
+| this\_rds\_cluster\_resource\_id | The Resource ID of the cluster |
 | this\_rds\_cluster\_instance\_endpoints | A list of all cluster instance endpoints |
 | this\_rds\_cluster\_master\_password | The master password |
 | this\_rds\_cluster\_master\_username | The master username |

examples/mysql/main.tf

@@ -79,3 +79,24 @@ module "vpc" {
     "10.0.9.0/25",
   ]
 }
+
+# IAM Policy for use with iam_database_authentication = true
+resource "aws_iam_policy" "aurora_mysql_policy_iam_auth" {
+  name = "test-aurora-db-57-policy-iam-auth"
+  policy = <<POLICY
+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Effect": "Allow",
+      "Action": [
+        "rds-db:connect"
+      ],
+      "Resource": [
+        "arn:aws:rds-db:us-east-1:123456789012:dbuser:${module.aurora.this_rds_cluster_resource_id}/jane_doe"
+      ]
+    }
+  ]
+}
+POLICY
+}

outputs.tf

@@ -4,6 +4,11 @@ output "this_rds_cluster_id" {
   value       = "${aws_rds_cluster.this.id}"
 }
 
+output "this_rds_cluster_resource_id" {
+  description = "The Resource ID of the cluster"
+  value       = "${aws_rds_cluster.this.cluster_resource_id}"
+}
+
 output "this_rds_cluster_endpoint" {
   description = "The cluster endpoint"
   value       = "${aws_rds_cluster.this.endpoint}"