Add variable to control DocumentDB cluster size

README.md

@@ -77,6 +77,7 @@ that can be used to create a Cyber Hygiene (CyHy) environment in AWS.
 |------|-------------|------|---------|:--------:|
 | aws\_availability\_zones | The list of AWS availability zones to deploy into (e.g. ["us-east-1a", "us-east-1b", "us-east-1c"]. | `list(string)` | ```[ "us-east-1a", "us-east-1b", "us-east-1c" ]``` | no |
 | aws\_region | The AWS region to deploy into (e.g. "us-east-1"). | `string` | `"us-east-1"` | no |
+| db\_cluster\_size | The number of instances to use for the DocumentDB cluster. | `number` | `3` | no |
 | db\_instance\_class | The instance class to use for the DocumentDB cluster. | `string` | `"db.r5.large"` | no |
 | db\_name | The name of the database to create. | `string` | `"cyhy"` | no |
 | db\_password | The master password for the database user. | `string` | n/a | yes |

documentdb.tf

@@ -6,6 +6,7 @@ module "documentdb-cluster" {
   source  = "cloudposse/documentdb-cluster/aws"
   version = "0.27.0"
 
+  cluster_size    = var.db_cluster_size
   db_port         = var.db_port
   instance_class  = var.db_instance_class
   master_password = var.db_password

variables.tf

@@ -32,6 +32,12 @@ variable "aws_region" {
   type        = string
 }
 
+variable "db_cluster_size" {
+  default     = 3
+  description = "The number of instances to use for the DocumentDB cluster."
+  type        = number
+}
+
 variable "db_instance_class" {
   default     = "db.r5.large"
   description = "The instance class to use for the DocumentDB cluster."