update to allow for engine version 4.0.0

main.tf

@@ -3,12 +3,12 @@ resource "aws_docdb_subnet_group" "docdb" {
   subnet_ids  = var.group_subnets
 }
 
-resource "aws_docdb_cluster" "api_docdb" {
+resource "aws_docdb_cluster" "docdb" {
   cluster_identifier_prefix       = var.name
   db_subnet_group_name            = aws_docdb_subnet_group.docdb.name
-  db_cluster_parameter_group_name = aws_docdb_cluster_parameter_group.api_docdb.name
+  db_cluster_parameter_group_name = aws_docdb_cluster_parameter_group.docdb.name
   vpc_security_group_ids          = var.cluster_security_group
-  engine                          = "docdb"
+  engine                          = var.engine
   master_username                 = var.master_username
   master_password                 = var.master_password
   storage_encrypted               = var.storage_encrypted
@@ -22,13 +22,13 @@ resource "aws_docdb_cluster" "api_docdb" {
 resource "aws_docdb_cluster_instance" "cluster_instances" {
   count              = var.cluster_instance_count
   identifier         = "${var.name}-${count.index}"
-  cluster_identifier = aws_docdb_cluster.api_docdb.id
+  cluster_identifier = aws_docdb_cluster.docdb.id
   instance_class     = var.cluster_instance_class
   ca_cert_identifier = var.ca_cert_identifier
 }
 
-resource "aws_docdb_cluster_parameter_group" "api_docdb" {
-  family      = "docdb3.6"
+resource "aws_docdb_cluster_parameter_group" "docdb" {
+  family      = var.family
   name_prefix = var.name
   description = "${var.name} docdb cluster parameter group"
   dynamic "parameter" {

output.tf

@@ -1,27 +1,27 @@
 output "arn" {
-  value = aws_docdb_cluster.api_docdb.arn
+  value = aws_docdb_cluster.docdb.arn
 }
 
 output "cluster_members" {
-  value = aws_docdb_cluster.api_docdb.cluster_members
+  value = aws_docdb_cluster.docdb.cluster_members
 }
 
 output "cluster_resource_id" {
-  value = aws_docdb_cluster.api_docdb.cluster_resource_id
+  value = aws_docdb_cluster.docdb.cluster_resource_id
 }
 
 output "endpoint" {
-  value = aws_docdb_cluster.api_docdb.endpoint
+  value = aws_docdb_cluster.docdb.endpoint
 }
 
 output "hosted_zone_id" {
-  value = aws_docdb_cluster.api_docdb.hosted_zone_id
+  value = aws_docdb_cluster.docdb.hosted_zone_id
 }
 
 output "id" {
-  value = aws_docdb_cluster.api_docdb.id
+  value = aws_docdb_cluster.docdb.id
 }
 
 output "reader_endpoint" {
-  value = aws_docdb_cluster.api_docdb.reader_endpoint
+  value = aws_docdb_cluster.docdb.reader_endpoint
 }

variables.tf

@@ -66,3 +66,21 @@ variable "ca_cert_identifier" {
   description = "Optional, identifier of the CA certificate to use for DB instance"
   type        = string
 }
+
+variable "family" {
+  default     = "docdb3.6"
+  description = "Version of docdb family being created"
+  type        = string
+}
+
+variable "engine" {
+  default     = "docdb"
+  description = "The name of the database engine to be used for this DB cluster. Only `docdb` is supported."
+  type        = string
+}
+
+variable "engine_version" {
+  default     = "3.6.0"
+  description = "The database engine version. Updating this argument results in an outage."
+  type        = string
+}