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Terraform Input Variables Assign when prompted

Step-01: Introduction

  • Provide Input Variables when prompted during terraform plan or apply in CLI

Step-02: Input Variables Assign When Prompted

  • Add a new variable in c2-variables.tf named subnet_name without any default value.
  • As the variable doesn't have any default value when you execute terraform plan or terraform apply it will prompt for the variable. 
# 6. Subnet Name: Assign When Prompted using CLI
variable "subnet_name" {
  description = "Virtual Network Subnet Name"
  type = string 
}

Step-03: Update c4-virtual-network.tf Subnet Resource

# Create Subnet
resource "azurerm_subnet" "mysubnet" {
  #name                 = var.subnet_name
  name                 = "${azurerm_virtual_network.myvnet.name}-${var.subnet_name}"
  resource_group_name  = azurerm_resource_group.myrg.name
  virtual_network_name = azurerm_virtual_network.myvnet.name
  address_prefixes     = ["10.0.2.0/24"]
}

Step-04: Execute Terraform Commands

# Initialize Terraform
terraform init

# Validate Terraform configuration files
terraform validate

# Format Terraform configuration files
terraform fmt

# Review the terraform plan
terraform plan

# Observation
1. Verify Resource Group Name
2. Verify Virtual Network Name
3. Verify Virtual Network Subnet Name

Step-05: Clean-Up

# Delete Files
rm -rf .terraform*

References