Terraform Command Basics

Step-01: Introduction

• Understand basic Terraform Commands
• terraform init
• terraform validate
• terraform plan
• terraform apply
• terraform destroy

Step-02: Review terraform manifests

• Pre-Conditions-1: Get Azure Regions and decide the region where you want to create resources

  # Get Azure Regions
  az account list-locations -o table
  

• Pre-Conditions-2: If not done earlier, complete az login via Azure CLI. We are going to use Azure CLI Authentication for Terraform when we use Terraform Commands.

  # Azure CLI Login
  az login
  
  # List Subscriptions
  az account list
  
  # Set Specific Subscription (if we have multiple subscriptions)
  az account set --subscription="SUBSCRIPTION_ID"
  

• Azure Regions
• Azure Regions Detailed

  # Terraform Settings Block
  terraform {
    required_version = ">= 1.0.0"
    required_providers {
      azurerm = {
        source = "hashicorp/azurerm"
        version = ">= 2.0" # Optional but recommended in production
      }    
    }
  }
  # Configure the Microsoft Azure Provider
  provider "azurerm" {
    features {}
  }
  # Create Resource Group 
  resource "azurerm_resource_group" "my_demo_rg1" {
    location = "eastus"
    name = "my-demo-rg1"  
  }
  

Step-03: Terraform Core Commands

# Terraform Initialize
terraform init

# Terraform Validate
terraform validate

# Terraform Plan to Verify what it is going to create / update / destroy
terraform plan

# Terraform Apply to Create Resources
terraform apply 

Step-04: Verify Azure Resource Group in Azure Management Console

• Go to Azure Management Console -> Resource Groups
• Verify newly created Resource Group
• Review terraform.tfstate file

Step-05: Destroy Infrastructure

# Destroy Azure Resource Group 
terraform destroy
Observation:
1. Verify if the resource group got deleted in Azure Management Console
2. Verify terraform.tfstate file and resource group info should be removed
3. Verify terraform.tfstate.backup, it should have the resource group info here stored as backup. 

# Delete Terraform files 
rm -rf .terraform*
rm -rf terraform.tfstate*

Step-08: Conclusion

• Re-iterate what we have learned in this section
• Learned about Important Terraform Commands
• terraform init
• terraform validate
• terraform plan
• terraform apply
• terraform destroy

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