Terraform 101 Learning Repository

A comprehensive learning repository for Terraform with progressive examples from basic concepts to advanced patterns.

🎯 Learning Path

This repository is organized as a progressive learning journey:

📁 Examples Structure

1. 01-basics/ - Terraform fundamentals

   • Provider configuration
   • Basic resources
   • Variables and outputs
   • Local state management

2. 02-variables-outputs/ - Advanced variables

   • Complex variable types (lists, maps, objects)
   • Variable validation
   • Local values and computed data
   • Advanced output formatting

3. 03-data-sources/ - Data sources

   • Fetching existing infrastructure data
   • External data sources
   • System information queries

4. 04-conditionals-loops/ - Control flow

   • Conditional expressions
   • Count and for_each
   • Dynamic blocks

5. 05-modules/ - Module development

   • Creating reusable modules
   • Module composition
   • Module registry usage

🛠️ Tools & Best Practices

• pre-commit/ - Code quality automation
  • Terraform formatting and validation
  • Security scanning with tfsec and checkov
  • Documentation generation

☁️ Cloud Provider Examples

Real-world infrastructure examples for major cloud providers:

• aws/ - Amazon Web Services

  • VPC with public/private subnets
  • EC2 instances with security groups
  • Application Load Balancer
  • Auto Scaling configuration

• azure/ - Microsoft Azure

  • Virtual Network and subnets
  • Virtual Machines with load balancing
  • Storage accounts and monitoring
  • Resource group management

• gcp/ - Google Cloud Platform

  • VPC networks and firewall rules
  • Compute Engine instances
  • Cloud Storage integration
  • Managed instance groups

🔄 CI/CD Automation

• .github/workflows/ - GitHub Actions workflows
  • terraform-validate.yml - Code validation and security scanning
  • terraform-plan.yml - Pull request planning and commenting
  • terraform-deploy.yml - Multi-cloud deployment pipeline
  • terraform-drift.yml - Infrastructure drift detection
  • See CI/CD Setup Guide for configuration

🚀 Quick Start

Prerequisites

• Terraform >= 1.0
• pre-commit (optional, for code quality)

Getting Started

1. Clone and explore:

   git clone <repo-url>
   cd terraform-101

2. Start with basics:

   cd 01-basics
   terraform init
   terraform plan
   terraform apply

3. Set up pre-commit (recommended):

   cp pre-commit/.pre-commit-config.yaml .pre-commit-config.yaml
   pre-commit install

📚 Learning Resources

• Terraform Documentation
• Terraform Registry
• HashiCorp Learn
• Terraform Best Practices

🎓 How to Use This Repository

1. Follow the numbered order - Each example builds on concepts from previous ones
2. Read the README in each directory for specific learning objectives
3. Experiment - Modify the examples to see how changes affect behavior
4. Use pre-commit - Learn professional development practices
5. Check outputs - Understand how Terraform manages state and outputs

💡 Tips for Learning

• Start small and build complexity gradually
• Always run terraform plan before apply
• Understand state management early
• Practice with different variable types
• Learn to read Terraform documentation
• Use terraform console for testing expressions

🔧 Common Commands

# Format all Terraform files
terraform fmt -recursive

# Validate configuration
terraform validate

# Show current state
terraform show

# List resources in state
terraform state list

# Interactive console
terraform console