InfraProvisioning with Terraform

• Infra Provisioning helps in automating the infra creation, To do this we have various apporaches
  • scripts (use awscli/azurecli/python)
    • procedural (how it has to be done)
    • focus is on steps
  • Infrastruce as Code (IaC)
    • Declarative (what is needed)
    • Focus is on desired state
• Popular IaC Tools
  • Cloud formation:
    • This works only on AWS
  • ARM Templates
    • This works only on Azure
  • Bicep (Azure)
  • Terraform:
    • This works with almost all clouds and even hypervisors like vmware
  • OpenTofu
    • This is a fork of terraform and will remain opensource

Terraform

• This is a project by Hashicorp
• Terraform is developed in Golang
• Terraform uses a language called as HCL (Hashicorp Configuration Language)

Terraform components

• Template
• Providers
  
• Resources
  

Terminology

• Arguments:
  • Refers to an input
• Attribute
  • Refers to an output

Installing Terraform

• Refer Here for documentation

Hello terraform

• Create a new folder
• Create a new file called as main.tf in it

terraform {
  required_providers {
    aws = {
      source = "hashicorp/aws"
      version = "5.82.2"
    }
  }
}

provider "aws" {
  region = "ap-south-1"
}

resource "aws_vpc" "net" {
    cidr_block = "10.10.0.0/16"
    tags = {
      Name = "hello-tf"
    }

}

• Now from your terminal cd into this folder and execute

terraform init
terraform apply

• We can connect to multiple clouds from same template.