What is Terraform?

Terraform is an open-source Infrastructure as Code (IaC) tool created by HashiCorp.
It allows you to define, provision, and manage infrastructure using simple configuration files instead of manual clicks.

With Terraform, infrastructure becomes:

• Version-controlled

• Repeatable

• Predictable

• Automated

Why Terraform is Used in Modern Tech Industry

Modern systems are:

• Cloud-native

• Multi-region

• Microservice-based

• Fast-scaling

Terraform helps teams:

• Provision infra in minutes instead of hours

• Avoid manual configuration mistakes

• Maintain consistency across environments (dev, staging, prod)

• Collaborate using Git-based workflows

• Scale infrastructure safely

Popular IaC Tools (Terraform vs Others)

Why Do We Need Terraform?

Without Terraform:

• Infrastructure is created manually

• No clear documentation of infra

• Hard to reproduce environments

• Changes are risky and error-prone

With Terraform:

• Infra lives as code

• Easy rollback and audit

• Same config works across environments

• Infrastructure becomes part of CI/CD

Challenges Without IaC

• “It works on my machine” issues

• Environment drift

• Manual misconfigurations

• Slow deployments

• No single source of truth

Terraform eliminates these problems.

Where Terraform is Mostly Used

• Cloud infrastructure provisioning

• Kubernetes clusters

• Networking (VPCs, subnets, gateways)

• Databases and storage

• CI/CD pipeline infra

• Multi-region deployments

Terraform Installation Guide

Linux

sudo apt update
sudo apt install -y wget unzip

wget https://releases.hashicorp.com/terraform/1.9.0/terraform_1.9.0_linux_amd64.zip
unzip terraform_1.9.0_linux_amd64.zip
sudo mv terraform /usr/local/bin/

terraform version

windows

• Download Terraform from official site

• Extract terraform.exe

• Add it to System PATH

• verify in cmd:- terraform version

Other methods

# For macOS
brew install hashicorp/tap/terraform

# For Ubuntu/Debian
wget -O- https://apt.releases.hashicorp.com/gpg | sudo gpg --dearmor -o /usr/share/keyrings/hashicorp-archive-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/hashicorp-archive-keyring.gpg] https://apt.releases.hashicorp.com $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/hashicorp.list
sudo apt update && sudo apt install terraform

Setup Commands

terraform -install-autocomplete
alias tf=terraform
terraform -version

Common Installation Error (macOS)

If you encounter: Error: No developer tools installed.

Install Command Line Tools:

xcode-select --install

For more details visit my github repo:- https://github.com/sidharthhhh/terraform

https://github.com/piyushsachdeva/Terraform-Full-Course-Aws/tree/main/lessons/day01

For more detail explaination watch:- https://youtu.be/s5fwSG_00P8?si=bj9kYlOZH3Q6Eawy