Effortless Provisioning of VPC on AWS with Terraform

Forget the struggle of manual AWS VPC configuration. Terraform steps in as your automation hero, empowering you to effortlessly build your network with concise code and precise control.

Terraform's Advantages:

- Automation Maestro: Ditch the tedious clicks and configure your VPC in a single file. Simply describe your desired infrastructure, and Terraform orchestrates the magic behind the scenes.
- Error-proofing Fortress: Bid farewell to configuration woes. Terraform's validation checks catch potential issues before deployment, ensuring a smooth and successful ride.

Crafting Your VPC Step-by-Step:

For easier, you can copy my code. Then I will explain about it.
/main.tf

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 4.16"
    }
  }

  required_version = ">= 1.2.0"
}

provider "aws" {
  region = "us-east-1"
}

resource "aws_vpc" "networkABC" {
  cidr_block = "10.0.0.0/16"

  tags = {
    "author" = "vuongbach"
  }
}

resource "aws_internet_gateway" "networkABC_IGW" {
  vpc_id = aws_vpc.networkABC.id
}

resource "aws_subnet" "networkABC_public_subnets" {
  count      = length(var.public_subnet_cidrs)
  vpc_id     = aws_vpc.networkABC.id
  cidr_block = var.public_subnet_cidrs[count.index]
}

resource "aws_subnet" "networkABC_private_subnets" {
  count      = length(var.private_subnet_cidrs)
  vpc_id     = aws_vpc.networkABC.id
  cidr_block = var.private_subnet_cidrs[count.index]
}

resource "aws_route_table" "networkABC_RT_public" {
  vpc_id = aws_vpc.networkABC.id
  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = aws_internet_gateway.networkABC_IGW.id
  }
}

resource "aws_route_table_association" "networkABC_RT_public_association" {
  count          = length(aws_subnet.networkABC_public_subnets)
  subnet_id      = aws_subnet.networkABC_public_subnets[count.index].id
  route_table_id = aws_route_table.networkABC_RT_public.id
}

/vars.tf

variable "vpc_cidr" {
  description = "CIDR block for the VPC"
  type        = string
  default     = "10.0.0.0/16"
}

variable "public_subnet_cidrs" {
  description = "CIDR blocks for the public subnets"
  type        = list(string)
  default     = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
}

variable "private_subnet_cidrs" {
  description = "CIDR blocks for the private subnets"
  type        = list(string)
  default     = ["10.0.4.0/24", "10.0.5.0/24", "10.0.6.0/24"]
}

Code Structure:

main.tf: This is the stage where your VPC setup takes center stage. Define providers, CIDR blocks, gateways, subnets, and route tables, crafting the blueprint for your network.

vars.tf: Imagine this as the dressing room - store variables like CIDR blocks and subnet configurations for easy modification and cleaner code in main.tf.
Code Breakdown - Building Blocks of Your VPC:
Provider Declaration: Specify the AWS provider and region, setting the stage for your cloud deployment.
VPC Establishment: Define the heart of your network - the VPC - with its CIDR block and a nametag for easy identification.

VPC resource in Terraform code

• Internet Gateway: Create a gateway for venturing into the vast internet, attaching it to your VPC for seamless external connectivity.

• Subnets: Designate both public and private subnets within your VPC, assigning them individual CIDR blocks to segment your network for optimized security and control.

• Route Table: Establish a public route table, directing traffic through the internet gateway for your public subnets.

• Association: Connect your public subnets with the public route table, ensuring they have access to the wider world.

Commanding the Stage:

Once your code is ready, it's time to bring your VPC to life!

• terraform init: Initialize Terraform within your project directory.
• terraform fmt: Ensure your code is neat and tidy for better readability.
• terraform validate: Double-check your configuration for any lurking errors.
• terraform apply: Let Terraform work its magic, deploying your VPC infrastructure to the AWS cloud.

Upon successful deployment, witness your VPC network come to life, ready to host your applications and services.