Terraform In One Shot

This repository is your one stop solution for Terraform for DevOps Engineers

Terraform Commands - Complete Guide

1. Setup & Initialization

Install Terraform

# Linux & macOS
curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo apt-key add -
sudo apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"
sudo apt-get update && sudo apt-get install terraform

# Verify Installation
terraform -v

Initialize Terraform

terraform init

• Downloads provider plugins
• Sets up the working directory

2. Terraform Core Commands

Format & Validate Code

terraform fmt       # Formats Terraform code
terraform validate  # Validates Terraform syntax

Plan & Apply Infrastructure

terraform plan      # Shows execution plan without applying
terraform apply     # Creates/updates infrastructure
terraform apply -auto-approve  # Applies without manual confirmation

Destroy Infrastructure

terraform destroy  # Destroys all managed resources
terraform destroy -auto-approve  # Without confirmation

3. Managing Terraform State

Check Current State

terraform state list  # Lists all managed resources
terraform show        # Shows detailed resource info

Manually Modify State

terraform state mv <source> <destination>  # Move resource in state file
terraform state rm <resource>  # Removes resource from state (not from infra)

Remote Backend (S3 & DynamoDB)

terraform {
  backend "s3" {
    bucket         = "my-terraform-state"
    key            = "global/s3/terraform.tfstate"
    region         = "us-east-1"
    dynamodb_table = "terraform-lock"
    encrypt        = true
  }
}

terraform init  # Reinitialize with remote backend

4. Variables & Outputs

Define & Use Variables

variable "instance_type" {
  default = "t2.micro"
}
resource "aws_instance" "web" {
  instance_type = var.instance_type
}

Pass Variables in CLI

terraform apply -var="instance_type=t3.small"

Output Values

output "instance_ip" {
  value = aws_instance.web.public_ip
}

terraform output instance_ip

5. Loops & Conditionals

for_each Example

resource "aws_s3_bucket" "example" {
  for_each = toset(["bucket1", "bucket2", "bucket3"])
  bucket   = each.key
}

Conditional Expressions

variable "env" {}
resource "aws_instance" "example" {
  instance_type = var.env == "prod" ? "t3.large" : "t2.micro"
}

6. Terraform Modules

Create & Use a Module

mkdir -p modules/vpc

# modules/vpc/main.tf
resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"
}

# Root module
module "vpc" {
  source = "./modules/vpc"
}

terraform init
terraform apply

7. Workspaces (Environment Management)

Create & Switch Workspaces

terraform workspace new dev
terraform workspace new prod
terraform workspace select prod
terraform workspace list

8. Terraform Debugging & Logs

export TF_LOG=DEBUG  # Enable debug logs
terraform apply 2>&1 | tee debug.log  # Save logs

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Projects

Terraform with Ansible

Get it here

Terraform with GitHub

Get it here

Terraform to EKS

Get it here

Final Thoughts

This README covers all the Terraform commands needed for your "Terraform in One Shot" video. Let me know if you need modifications or extra details! 🚀