Terraform Basics¶

(AI Slop here)

Terraform is an open-source infrastructure as code software tool that provides a consistent CLI workflow to manage hundreds of cloud services.

Core Concepts¶

Providers¶

Providers are plugins that Terraform uses to interact with cloud providers, SaaS providers, and other APIs.

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 5.0"
    }
  }
}

provider "aws" {
  region = "us-west-2"
}

Resources¶

Resources are the most important element in the Terraform language. Each resource block describes one or more infrastructure objects.

resource "aws_instance" "web" {
  ami           = "ami-0c02fb55956c7d316"
  instance_type = "t3.micro"

  tags = {
    Name = "HelloWorld"
  }
}

Variables¶

Input variables serve as parameters for a Terraform module.

variable "instance_type" {
  description = "Type of EC2 instance"
  type        = string
  default     = "t3.micro"
}

Terraform Workflow¶

Write - Author infrastructure as code
Plan - Preview changes before applying
Apply - Provision reproducible infrastructure

terraform init
terraform plan
terraform apply

State Management¶

Terraform keeps track of your real world infrastructure in a state file. This state is used to create plans and make changes to your infrastructure.