Terraform Explained | Infrastructure as Code (IaC) Tutorial | DevOps Class 21

Welcome to FusionPact DevOps Daily Classes – Class 21 🚀

In this session, we explain Terraform, one of the most powerful Infrastructure as Code (IaC) tools used by DevOps teams to automate cloud infrastructure across AWS, Azure, and Google Cloud.

Terraform allows you to define infrastructure using simple .tf files, version-control it using Git, and deploy scalable, consistent cloud resources with minimal effort.

📌 What You’ll Learn in DevOps Class 21

What is Terraform and why it is used

Infrastructure as Code (IaC) explained in simple terms

Why Terraform is cloud-agnostic

Terraform providers, resources, and state files

Terraform workflow: init, plan, apply, destroy

Local vs remote state management

Using variables, outputs, and modules

Real-world DevOps use cases with Terraform

How Terraform prevents duplicate infrastructure

Scaling infrastructure safely using code

⚙️ What is Terraform?

Terraform is an open-source Infrastructure as Code (IaC) tool that allows DevOps engineers to define cloud infrastructure using code and deploy it automatically.

Instead of manually creating servers, networks, and security rules, Terraform lets you describe what infrastructure you want, and it takes care of creating it across multiple cloud platforms.

🌍 Why Terraform is Popular

Cloud-agnostic (AWS, Azure, GCP supported)

Declarative syntax (simple & readable)

Version-controlled infrastructure

Prevents duplicate resource creation

Scalable and reusable infrastructure

Faster provisioning with fewer errors

🧱 Core Components of Terraform
1️⃣ Providers

Used to connect Terraform with cloud platforms like:

AWS

Azure

Google Cloud

2️⃣ Resources

Actual infrastructure objects such as:

EC2 instances

VPCs

Security Groups

Virtual Machines

3️⃣ State File

Tracks infrastructure history and prevents duplication.

4️⃣ Terraform CLI

Commands used to manage infrastructure:

terraform init

terraform plan

terraform apply

terraform destroy

5️⃣ Variables & Outputs

Variables help create reusable infrastructure

Outputs display information like IP addresses

6️⃣ Modules

Reusable templates to deploy infrastructure at scale.

🔄 Terraform Workflow Explained

Write infrastructure code in .tf files

Run terraform to initialize providers

Run terraform plan to preview changes

Run terraform apply to create infrastructure

Use terraform destroy to clean up resources

📦 State Management

Local State: Stored on local machine

Remote State: Stored in S3 for collaboration

State locking prevents multiple users from creating conflicts

🚀 Key Benefits of Terraform

Faster infrastructure provisioning

Reduced human errors

Consistent environments

Easy scaling by editing code

Supports CI/CD pipelines

Ideal for modern DevOps workflows

🎯 Final Takeaway

Terraform empowers DevOps teams to build, manage, and scale infrastructure using code, ensuring reliability, repeatability, and speed across cloud environments.

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