Terraform Command Basics¶

Link to Terraform Configuration Files ¶

Step-01: Introduction¶

Install Terraform
Understand what is Terraform
Understand Terrafom basic / essential commands
terraform version
terraform init
terraform plan
terraform validate
terraform apply
terraform show
terraform refresh
terraform providers
terraform destroy

Azure Kubernetes Service with Azure DevOps and Terraform¶

Pre-requisite-1: Install Visual Studio Code (VS Code Editor)¶

Download Visual Studio Code

Pre-requisite-2: Install HashiCorp Terraform plugin for VS Code¶

Install Terraform Plugin for VS Code

Step-02: Terraform Install¶

MAC OS¶

# Install on MAC OS
brew install hashicorp/tap/terraform

# Verify Terraform Version
terraform version

# To Upgrade on MAC OS
brew upgrade hashicorp/tap/terraform

# Verify Terraform Version
terraform version

# Verify Installation
terraform help
terraform help plan

# Enable Tab Completion
terraform -install-autocomplete

Step-03: Install Azure CLI¶

# AZ CLI Current Version (if installed)
az --version

# Install Azure CLI (if not installed)
brew update && brew install azure-cli

# Upgrade az cli version
az --version
brew upgrade azure-cli 
[or]
az upgrade
az --version

# Azure CLI Login
az login

# List Subscriptions
az account list

# Set Specific Subscription (if we have multiple subscriptions)
az account set --subscription="SUBSCRIPTION_ID"

Step-04: Understand terrafrom init & provider azurerm¶

Understand about Terraform Providers
Understand about azurerm terraform provider, version and features
terraform init: Initialize a Terraform working directory

terraform apply: Builds or changes infrastructure

# Change Directory to v1 folder
cd v1-terraform-azurerm-provider

# Initialize Terraform
terraform init

# Explore ".terraform" folder
cd .terraform
Go inside folders and review (.terraform/plugins/registry.terraform.io/hashicorp/azurerm/2.35.0/darwin_amd64)

# Execute terraform apply
terraform apply 
ls -lrta
discuss about "terraform.tfstate"

# Delete .terraform folder (Understand what happens)
rm -rf .terraform 
terraform apply (Should say could not load plugin)
To fix execute "terraform init" 

# Clean-Up V1 folder
rm terraform.tfstate
ls -lrta

Step-04: Understand terraform plan, apply & Create Azure Resource Group¶

Authenticate to Azure using Azure CLI az login
Understand about terraform plan
Understand about terraform apply
Create Azure Resource Group using Terraform
terraform init: Initialize a Terraform working directory
terraform plan: Generate and show an execution plan

terraform apply: Builds or changes infrastructure

# Change Directory to v2 folder
cd ../
cd v2-terraform-azurerm-resource-group

# Initialize Terraform
terraform init

# Validate terraform templates
terraform validate

# Dry run to see what resources gets created
terraform plan

# Create Resource Group in Azure
terraform apply

Verify if resource group created in Azure using Management Console

Step-05: Make changes to Resource Group and Deploy¶

Add tags to Resource Group as below

# Create a Azure Resource Group
resource "azurerm_resource_group" "aksdev" {
  name     = "aks-rg2-tf"
  location = "Central US"

# Add Tags
  tags = {
    "environment" = "k8sdev"
  }
}

Run terraform plan and apply

# Dry run to see what resources gets created
terraform plan

# Create Resource Group in Azure
terraform apply

Verify if resource group created in Azure using Management Console

Step-06: Modify Resource Group Name and Understand what happens¶

Change Resource Group name from aks-rg2-tf to aks-rg2-tf2 in main.tf

# Understand what happens with this change
terraform plan

# Apply changes
terraform apply

Verify if resource group with new name got re-created in Azure using Management Console

Step-07: Understand terraform refresh in detail¶

terraform refresh: Update local state file against real resources in cloud
Desired State: Local Terraform Manifest (main.tf)
Current State: Real Resources present in your cloud
Command Order of Execution: refresh, plan, make a decision, apply
Why? Lets understand that in detail about this order of execution

Step-07-01: Add a new tag to Resource Group using Azure Portal Management console¶

demotag: refreshtest

Step-07-02: Execute terraform plan¶

You should observe no changes to local state file because plan does the comparison in memory
no update to tfstate file locally about the change
```
# Execute Terraform plan
terraform plan 
```

Step-07-03: Execute terraform refresh¶

You should see local state file updated with new demo tag

# Execute terraform refresh
ls -lrta
terraform refresh
diff terraform.tfstate.backup terraform.tfstate

Step-07-04: Why you need to the execution in this order (refresh, plan, make a decision, apply) ?¶

There are changes happened in your infra manually and not via terraform.
Now decision to be made if you want those changes or not.
Choice-1: If you dont want those changes proceed with terraform apply so manual changes will be removed.
Choice-2: If you want those changes, refer terraform.tfstate file about changes and embed them in your terraform manifests (example: main.tf) and proceed with flow (referesh, plan, review execution plan and apply)

Step-07-05: I picked choice-2, so i will update the tags in main.tf¶

Update in main.tf

  tags = {
    "environment" = "k8sdev"
    "demotag"     = "refreshtest"
  }

Step-07-06: Execute the commands to make our manual change official in terraform manifests and tfstate files perspective¶

# Execute commands
ls -lrta
terraform refresh
diff terraform.tfstate.backup terraform.tfstate
terraform plan
terraform apply

Step-08: Understand terraform show, providers¶

terraform show: Inspect Terraform state or plan

terraform providers: Prints a tree of the providers used in the configuration

# Terraform Show
terraform show

# Terraform Providers
terraform providers

Step-09: Understand terraform destroy¶

Understand about terraform destroy

# Delete newly created Resource Group in Azure 
terraform destroy

# Delete State (Deleting for github repo case for course purpose)
rm -rf .terraform
rm -rf terraform.tfstate

Terraform Command Basics¶

Link to Terraform Configuration Files ¶

Step-01: Introduction¶

Azure Kubernetes Service with Azure DevOps and Terraform¶

Pre-requisite-1: Install Visual Studio Code (VS Code Editor)¶

Pre-requisite-2: Install HashiCorp Terraform plugin for VS Code¶

Step-02: Terraform Install¶

MAC OS¶

Step-03: Install Azure CLI¶

Step-04: Understand terrafrom init & provider azurerm¶

Step-04: Understand terraform plan, apply & Create Azure Resource Group¶

Step-05: Make changes to Resource Group and Deploy¶

Step-06: Modify Resource Group Name and Understand what happens¶

Step-07: Understand terraform refresh in detail¶

Step-07-01: Add a new tag to Resource Group using Azure Portal Management console¶

Step-07-02: Execute terraform plan¶

Step-07-03: Execute terraform refresh¶

Step-07-04: Why you need to the execution in this order (refresh, plan, make a decision, apply) ?¶

Step-07-05: I picked choice-2, so i will update the tags in main.tf¶

Step-07-06: Execute the commands to make our manual change official in terraform manifests and tfstate files perspective¶

Step-08: Understand terraform show, providers¶

Step-09: Understand terraform destroy¶

References¶

Best Selling Azure Kubernetes Service Course on Udemy ¶

Best Selling AWS EKS Kubernetes Course on Udemy ¶

HashiCorp Certified Terraform Associate - 50 Practical Demos ¶

Terraform Command Basics¶

Link to Terraform Configuration Files¶

Step-01: Introduction¶

Azure Kubernetes Service with Azure DevOps and Terraform¶

Pre-requisite-1: Install Visual Studio Code (VS Code Editor)¶

Pre-requisite-2: Install HashiCorp Terraform plugin for VS Code¶

Step-02: Terraform Install¶

MAC OS¶

Step-03: Install Azure CLI¶

Step-04: Understand terrafrom init & provider azurerm¶

Step-04: Understand terraform plan, apply & Create Azure Resource Group¶

Step-05: Make changes to Resource Group and Deploy¶

Step-06: Modify Resource Group Name and Understand what happens¶

Step-07: Understand terraform refresh in detail¶

Step-07-01: Add a new tag to Resource Group using Azure Portal Management console¶

Step-07-02: Execute terraform plan¶

Step-07-03: Execute terraform refresh¶

Step-07-04: Why you need to the execution in this order (refresh, plan, make a decision, apply) ?¶

Step-07-05: I picked choice-2, so i will update the tags in main.tf¶

Step-07-06: Execute the commands to make our manual change official in terraform manifests and tfstate files perspective¶

Step-08: Understand terraform show, providers¶

Step-09: Understand terraform destroy¶

References¶

Best Selling Azure Kubernetes Service Course on Udemy¶

Best Selling AWS EKS Kubernetes Course on Udemy¶

HashiCorp Certified Terraform Associate - 50 Practical Demos¶

Link to Terraform Configuration Files ¶

Best Selling Azure Kubernetes Service Course on Udemy ¶

Best Selling AWS EKS Kubernetes Course on Udemy ¶

HashiCorp Certified Terraform Associate - 50 Practical Demos ¶