Terraform Infrastructure Project

This Terraform project creates a VPC with public and private subnets, an internet gateway, route tables, and EC2 instances for a bastion host and an application server. The state file is stored in an S3 bucket and DynamoDB table, and the infrastructure can be deployed to multiple regions using separate workspaces.

Requirements

Terraform version 1.4.5 or later.
Access keys for an AWS account with sufficient permissions to create the required resources.
An S3 bucket and DynamoDB table for storing the Terraform state file.

Usage

1- Clone the repository and navigate to the project directory.

2- Initialize the Terraform project by running the terraform init command.

3- Create two workspace directories named dev and prod by running the mkdir command.

4- Create two variable definition files named dev.tfvars and prod.tfvars with environment-specific variable values.

5- Apply the code and create the infrastructure in the us-east-1 and eu-central-1 regions by running the following commands:

terraform workspace new dev
terraform workspace new prod
terraform apply -var-file=dev.tfvars -var region=us-east-1
terraform apply -var-file=prod.tfvars -var region=eu-central-1

6- To destroy the infrastructure, run the terraform destroy command in each workspace directory.

Variables

The following variables can be set in the dev.tfvars and prod.tfvars files:

Variable Description

vpc_cidr_block The CIDR block for the VPC.
vpc_name The name of the VPC.
igw_name The name of the internet gateway.
public_rt_name The name of the public route table.
private_rt_name The name of the private route table.
ssh_sg_name The name of the security group that allows SSH traffic.
app_sg_name The name of the security group that allows SSH and port 3000 traffic.
bastion_name The name of the Bastion EC2 instance.
bastion_ami The ID of the Amazon Machine Image (AMI) for the Bastion EC2 instance.
bastion_instance_type The instance type for the Bastion EC2 instance.
app_name The name of the application EC2 instance.
app_ami The ID of the Amazon Machine Image (AMI) for the application EC2 instance.
app_instance_type The instance type for the application EC2 instance.
key_name The name of the key pair to use for SSH access.
public_subnet_id The ID of the public subnet.
private_subnet_id The ID of the private subnet.
backend_bucket_name The name of the S3 bucket for storing the Terraform state file.
backend_region The region of the S3 bucket and DynamoDB table.
backend_dynamodb_table_name The name of the DynamoDB table for storing the Terraform state file.

Modules

The project includes a network module that creates the VPC, internet gateway, route tables, and subnets. To use this module, add the following code to your main Terraform file:

module "network" {
  source = "./network"
  vpc_cidr_block = var.vpc_cidr_block
  vpc_name = var.vpc_name
  igw_name = var.igw_name
  public_rt_name = var.public_rt_name
  private_rt_name = var.private_rt_name
  ssh_sg_name = var.ssh_sg_name
  app_sg_name = var.app_sg_name
  public_subnet_cidr_block = var.public_subnet_cidr_block
  private_subnet_cidr_block = var.private_subnet_cidr_block
}

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