Option to disable MongoDB node - shutting down the ecs service

Author: jzlatanovic

README.md

@@ -82,12 +82,12 @@ module "mongodb_cluster" {
 | [aws_iam_policy_document.mongodb_node](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
 | [aws_iam_policy_document.mongodb_tasks_execution_role](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
 | [aws_subnet.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/subnet) | data source |
-| [aws_vpc.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/vpc) | data source |
 
 ## Inputs
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
+| <a name="input_disable_mongodb_service"></a> [disable\_mongodb\_service](#input\_disable\_mongodb\_service) | Whether to run MongoDB service or not | `bool` | `false` | no |
 | <a name="input_env_code"></a> [env\_code](#input\_env\_code) | Short environment name tag (e.g. dev, stg, prod) | `string` | n/a | yes |
 | <a name="input_environment"></a> [environment](#input\_environment) | Environment indicator where the MongoDB will be instantiated. E.g. Development, Staging, QA, Production | `string` | n/a | yes |
 | <a name="input_instance_type"></a> [instance\_type](#input\_instance\_type) | Type of ECS container instance type | `string` | n/a | yes |

main.tf

@@ -23,10 +23,6 @@ data "aws_subnet" "this" {
   id = var.mongodb_nodes.0.subnet_id
 }
 
-data "aws_vpc" "this" {
-  id = data.aws_subnet.this.vpc_id
-}
-
 resource "aws_ecs_cluster" "mongodb" {
   name = local.cluster_name
   setting {
@@ -115,6 +111,8 @@ module "mongodb_nodes" {
   env_code    = var.env_code
   environment = var.environment
 
+  disable_mongodb_service = var.disable_mongodb_service
+
   name                   = each.value.unique_name
   primary_node_name      = local.primary_node_name
   subnet_id              = each.value.subnet_id

modules/mongodb-node/ecs.tf

@@ -96,7 +96,7 @@ resource "aws_ecs_service" "mongodb_node" {
   name                               = var.name
   cluster                            = data.aws_ecs_cluster.this.arn
   task_definition                    = aws_ecs_task_definition.mongodb_node.arn
-  desired_count                      = 1
+  desired_count                      = var.disable_mongodb_service ? 0 : 1
   deployment_minimum_healthy_percent = 0
   deployment_maximum_percent         = 100
   launch_type                        = "EC2"

modules/mongodb-node/variables.tf

@@ -95,6 +95,11 @@ variable "additional_security_group_ids" {
   description = "List of security groups attached to the MongoDB node"
 }
 
+variable "disable_mongodb_service" {
+  type    = bool
+  default = false
+}
+
 variable "ecs_cluster_name" {
   type = string
 }

variables.tf

@@ -34,6 +34,12 @@ variable "instance_type" {
   description = "Type of ECS container instance type"
 }
 
+variable "disable_mongodb_service" {
+  description = "Whether to run MongoDB service or not"
+  type        = bool
+  default     = false
+}
+
 variable "mongodb_nodes" {
   type = list(object({
     type : string,