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Chapter 4 - Terraform Command Basics

Learn init, validate, plan, apply, destrouy

Workflow​

  • init
  • validate
  • plan
  • apply
  • destroy

Run terraform init, terraform plan, etc.

Review the Terraform Manifest​

Get Azure regions​

az account list-locations -o table image.png

az login az account set --subscription="Subscript ID"

Terraform.io​

Providers:

  • Azure
  • AWS
  • GCP
  • Kubernetes

Add provider to .tf​

Copy the block from the provider's page on terraform.io.

terraform {
  required_version = ">= 1.0.0"
  required_providers {
    azurerm = {
      source = "hashicorp/azurerm"
      version = ">= 2.0"
    }    
  }
}

provider "azurerm" {
  features {}
}

Execute Terraform Core commands​

  1. Save this as a .tf file:
# Terraform Settings Block
terraform {
  required_version = ">= 1.0.0"
  required_providers {
    azurerm = {
      source = "hashicorp/azurerm"
      version = ">= 2.0" 
    }    
  }
}

# Configure the Microsoft Azure Provider
provider "azurerm" {
  features {}
}

# Create Resource Group 
resource "azurerm_resource_group" "my_demo_rg1" {
  location = "eastus"
  name = "my-demo-rg1"  
}
  1. cd into that directory
  2. run terraform init
  3. run terraform validate
  4. run terraform plan
  5. run terraform apply
  6. run terraform destroy

This is the basic terraform workflow.

What it created​

image.png

terraform folder​

providers folder, the provider in an exe format. image.png

image.png

Terraform Validate​

Validates the syntax of the entire terraform.tf structure

Terraform plan​

compares the existing to what the .tf file contains and shows the difference +/-/= that comparison.
image.png

terraform apply​

Confirms the changes needed and applies those changes. Also creates the terraform state file listed above.
You can view the .state file, but never make changes to it. image.png

Terraform destroy​

Removes ALL of the infrastructure. image.png

Clean up the files in the directory once these have been destroyed if you are not going to rebuild this infrastructure in the future.

rm -rf terraform.tfstate < state file rm -rf terraform.tfstate.backup < backup state file rm -rf *.terraform < folder

Summary​

  • init
  • validate
  • plan
  • apply
  • destroy