Refactor Terraform configuration for MongoDB deployment: modularize EC2 setup, add environment-specific variables, and create README for multi-environment usage.

Author: CloudNinjaDev

terraform/README.md

@@ -0,0 +1,78 @@
+# Multi-Environment Terraform Setup
+
+This repository uses a modular Terraform structure to deploy MongoDB EC2 instances across multiple environments.
+
+## Structure
+
+```
+terraform/
+├── modules/
+│   └── ec2/              # Reusable EC2 module
+├── production/           # Production environment
+│   ├── main.tf
+│   ├── variables.tf
+│   ├── terraform.tf
+│   └── production.tfvars
+└── staging/              # Staging environment
+    ├── main.tf
+    ├── variables.tf
+    ├── terraform.tf
+    └── staging.tfvars
+```
+
+## How It Works
+
+**Single Module, Multiple Environments:** The same EC2 module in `modules/ec2/` is reused by both staging and production environments with different `.tfvars` files.
+
+## Environment Differences
+
+| Setting | Staging | Production |
+|---------|---------|------------|
+| Instance Type | t3.small | t3.large |
+| Volume Size | 10 GB | 20 GB |
+| Tags | staging | production |
+
+## Usage
+
+### Deploy to Staging
+
+```bash
+cd terraform/staging
+terraform init
+terraform plan -var-file=staging.tfvars
+terraform apply -var-file=staging.tfvars
+```
+
+### Deploy to Production
+
+```bash
+cd terraform/production
+terraform init
+terraform plan -var-file=production.tfvars
+terraform apply -var-file=production.tfvars
+```
+
+### Destroy Resources
+
+```bash
+# Staging
+cd terraform/staging
+terraform destroy -var-file=staging.tfvars
+
+# Production
+cd terraform/production
+terraform destroy -var-file=production.tfvars
+```
+
+## Outputs
+
+Both environments output:
+- `instance_id` - EC2 instance ID
+- `instance_public_ip` - Public IP address
+- `instance_private_ip` - Private IP address
+
+## Customization
+
+To modify settings for each environment, edit the respective `.tfvars` file:
+- Staging: `terraform/staging/staging.tfvars`
+- Production: `terraform/production/production.tfvars`

terraform/main.tf terraform/modules/ec2/main.tfterraform/main.tf renamed to terraform/modules/ec2/main.tf

@@ -1,6 +1,6 @@
 resource "aws_security_group" "mongodb" {
-  name        = "mongodb-sg"
-  description = "Security group for MongoDB EC2 instance"
+  name        = "mongodb-sg-${var.environment}"
+  description = "Security group for MongoDB EC2 instance (${var.environment})"
   vpc_id      = var.vpc_id
 
   ingress {
@@ -28,23 +28,25 @@ resource "aws_security_group" "mongodb" {
   }
 
   tags = {
-    Name = "MongoDB Security Group"
+    Name        = "MongoDB-SG-${var.environment}"
+    Environment = var.environment
   }
 }
 
 resource "aws_instance" "mongodb" {
-  ami           = "ami-001fbc42d7df13f78"
+  ami           = var.ami_id
   instance_type = var.instance_type
   key_name      = var.key_name
-  
+
   vpc_security_group_ids = [aws_security_group.mongodb.id]
 
   root_block_device {
-    volume_size = 8
+    volume_size = var.root_volume_size
     volume_type = "gp3"
   }
 
   tags = {
-    Name = "MongoDB-Instance"
+    Name        = "MongoDB-${var.environment}"
+    Environment = var.environment
   }
 }

terraform/outputs.tf terraform/modules/ec2/outputs.tfterraform/outputs.tf renamed to terraform/modules/ec2/outputs.tf

@@ -1,6 +1,6 @@
 terraform {
   required_version = ">= 1.0"
-  
+
   required_providers {
     aws = {
       source  = "hashicorp/aws"

terraform/terraform.tf terraform/modules/ec2/terraform.tfterraform/terraform.tf renamed to terraform/modules/ec2/terraform.tf

@@ -1,3 +1,8 @@
+variable "environment" {
+  description = "Environment name (staging, production)"
+  type        = string
+}
+
 variable "aws_region" {
   description = "AWS region"
   type        = string
@@ -21,3 +26,15 @@ variable "vpc_id" {
   type        = string
   default     = "vpc-0c4669393c94b8f86"
 }
+
+variable "ami_id" {
+  description = "AMI ID for the EC2 instance"
+  type        = string
+  default     = "ami-001fbc42d7df13f78"
+}
+
+variable "root_volume_size" {
+  description = "Root volume size in GB"
+  type        = number
+  default     = 8
+}

terraform/variables.tf terraform/modules/ec2/variables.tfterraform/variables.tf renamed to terraform/modules/ec2/variables.tf

@@ -0,0 +1,26 @@
+module "ec2_mongodb" {
+  source = "../modules/ec2"
+
+  environment      = var.environment
+  aws_region       = var.aws_region
+  instance_type    = var.instance_type
+  key_name         = var.key_name
+  vpc_id           = var.vpc_id
+  ami_id           = var.ami_id
+  root_volume_size = var.root_volume_size
+}
+
+output "instance_id" {
+  description = "ID of the EC2 instance"
+  value       = module.ec2_mongodb.instance_id
+}
+
+output "instance_public_ip" {
+  description = "Public IP address of the EC2 instance"
+  value       = module.ec2_mongodb.instance_public_ip
+}
+
+output "instance_private_ip" {
+  description = "Private IP address of the EC2 instance"
+  value       = module.ec2_mongodb.instance_private_ip
+}

terraform/production/main.tf

@@ -0,0 +1,14 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 5.0"
+    }
+  }
+}
+
+provider "aws" {
+  region = var.aws_region
+}

terraform/production/terraform.tf

@@ -0,0 +1,39 @@
+variable "environment" {
+  description = "Environment name"
+  type        = string
+  default     = "production"
+}
+
+variable "aws_region" {
+  description = "AWS region"
+  type        = string
+  default     = "us-west-2"
+}
+
+variable "instance_type" {
+  description = "EC2 instance type"
+  type        = string
+  default     = "t3.large"
+}
+
+variable "key_name" {
+  description = "Key pair name for SSH access"
+  type        = string
+}
+
+variable "vpc_id" {
+  description = "VPC ID for the instance"
+  type        = string
+}
+
+variable "ami_id" {
+  description = "AMI ID for the EC2 instance"
+  type        = string
+  default     = "ami-001fbc42d7df13f78"
+}
+
+variable "root_volume_size" {
+  description = "Root volume size in GB"
+  type        = number
+  default     = 20
+}

terraform/production/variables.tf

@@ -0,0 +1,26 @@
+module "ec2_mongodb" {
+  source = "../modules/ec2"
+
+  environment      = var.environment
+  aws_region       = var.aws_region
+  instance_type    = var.instance_type
+  key_name         = var.key_name
+  vpc_id           = var.vpc_id
+  ami_id           = var.ami_id
+  root_volume_size = var.root_volume_size
+}
+
+output "instance_id" {
+  description = "ID of the EC2 instance"
+  value       = module.ec2_mongodb.instance_id
+}
+
+output "instance_public_ip" {
+  description = "Public IP address of the EC2 instance"
+  value       = module.ec2_mongodb.instance_public_ip
+}
+
+output "instance_private_ip" {
+  description = "Private IP address of the EC2 instance"
+  value       = module.ec2_mongodb.instance_private_ip
+}

terraform/staging/main.tf

@@ -0,0 +1,14 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 5.0"
+    }
+  }
+}
+
+provider "aws" {
+  region = var.aws_region
+}