Infrastructure as Code (IaC) using OpenTofu (the open-source fork of Terraform) on Azure, AWS, and GCP

Module 1: Introduction to OpenTofu 1.10

• What is OpenTofu?
• Differences between OpenTofu and Terraform
• OpenTofu ecosystem and community
• Core concepts: Providers, Resources, Variables, State, and Modules
• IaC fundamentals and benefits

Lab 1: Installing OpenTofu on local environments (Windows/macOS/Linux)

Module 2: Cloud Integration (Azure, AWS, GCP)

• Overview of Azure Resource Manager (ARM), AWS APIs, and GCP APIs
• Setting up authentication with Azure CLI, AWS CLI, and gcloud CLI
• Configuring OpenTofu with multi-cloud credentials
• Understanding cloud providers for OpenTofu
• Managing secrets securely with Azure Key Vault, AWS Secrets Manager, and Google Secret Manager

Lab 2:

• Configure OpenTofu to connect to Azure, AWS, and GCP
• Create a resource group (Azure), an S3 bucket (AWS), and a storage bucket (GCP)

Module 3: Building Infrastructure with OpenTofu

• Writing OpenTofu configuration files (.tf files)
• Variables, outputs, and data sources
• Resource dependencies and implicit ordering
• Managing cloud resources (VMs, networks, storage, etc.)
• Enhanced planning and modular design

Lab 3:

• Deploy a simple virtual network and compute instance on Azure, AWS, and GCP

Module 4: State Management

• Understanding state files
• Remote state storage using Azure Blob Storage, AWS S3, and GCP Cloud Storage
• State locking and collaboration
• Version control and state best practices

Lab 4:

• Configure remote state backends for each cloud provider
• Demonstrate collaborative infrastructure updates

Module 5: Modularity and Reusability

• Creating and using modules
• Structuring reusable OpenTofu configurations
• Using the OpenTofu Registry
• Passing variables and outputs between modules

Lab 5:

• Build a reusable multi-cloud networking module

Module 6: Testing, Validation, and Debugging

• Validating configurations (tofu validate, tofu fmt, tofu plan)
• Troubleshooting common errors
• Using tofu graph for dependency visualization
• Drift detection and remediation

Lab 6:

• Identify and fix configuration drift across multiple clouds

Module 7: CI/CD Integration with Azure DevOps, GitHub Actions & Jenkins

• Automating OpenTofu workflows
• Integrating with Azure DevOps Pipelines, GitHub Actions, and Jenkins
• Policy enforcement and approval gates

Lab 7:

• Set up a CI/CD pipeline to deploy multi-cloud infrastructure using OpenTofu

Module 8: Advanced Topics & Best Practices

• Managing environments (dev/test/prod)
• Secrets management and compliance
• Cost optimization and tagging strategies across providers
• Security considerations and governance
• Migrating from Terraform to OpenTofu

Lab 8:

• Implement multi-environment management using workspaces

Module 9: DevOps Automation Project

End-to-end project:

• Design and deploy a multi-tier application across Azure, AWS, and GCP using OpenTofu
• Include networking, compute, and storage layers
• Use remote state, modules, and pipeline automation

Tools & Resources

• OpenTofu CLI
• Azure CLI / AWS CLI / gcloud
• Visual Studio Code with OpenTofu extension
• Git / GitHub
• Azure DevOps, GitHub Actions, or Jenkins