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Terraform create Azure Virtual Network subnets from map of object and show name in the header

Terraform Create Azure Virtual Network Subnets From Map Of Object And Show Name In The Header

This is a second part and little update to Using element function with count meta argument example Terraform Azure subnets. After submitting PR (Pull Request), reviewer asked they want small change in the output how it shows on the console. As I am using count to loop through Subnet address prefixes on the each subnet name it shows number in the header iteration. They wanted me to make change and show the name of the subnet instead of count numbers.

Below is the output after changing the configuration file code in Terraform. Here how it looks like.

In the below code earlier I was using list for address prefixes inside variable subnet. After feedback I am simply used map object in for_each loop to iterate through it.

terraform {
  required_providers {
    azurerm = {
      source = "hashicorp/azurerm"
      #version = "=2.91.0"
    }
  }
}

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

variable "resource_group" {
  type        = string
  default     = "vcloud-lab.com"
  description = "Azure Virtual Network"
}

variable "virtual_network" {
  type        = string
  default     = "vcloud_lab_global_vnet01"
  description = "Azure Virtual Network"
}

variable "subnets" {
  type = map(object({
    address_prefix = string
  }))
  default = {
    subnet-1 = { address_prefix = "10.0.1.0/24" }
    subnet-2 = { address_prefix = "10.0.2.0/24" }
    subnet-3 = { address_prefix = "10.0.3.0/24" }
  }
  description = "vNet Subnet list"
}

data "azurerm_resource_group" "rginfo" {
  name = var.resource_group
}

data "azurerm_virtual_network" "vnetinfo" {
  name               = var.virtual_network
  resource_group_name  = data.azurerm_resource_group.rginfo.name
}

resource "azurerm_subnet" "name" {
  for_each            = var.subnets
  name                 = each.key
  resource_group_name  = data.azurerm_resource_group.rginfo.name
  virtual_network_name = data.azurerm_virtual_network.vnetinfo.name
  address_prefixes     = [each.value.address_prefix]
}

output "subnet_ids" {
  value = { for k, v in azurerm_subnet.name : k => v.id }
}

Download this script Terraform_functions_Azure_Subnet_Resource_Header_Name.tf here or it is also available on github.com.

Below is the new output makes more sense now when I look into output.

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terraform apply --auto-approve
data.azurerm_resource_group.rginfo: Reading...
data.azurerm_resource_group.rginfo: Read complete after 0s [id=/subscriptions/9e22xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx/resourceGroups/vcloud-lab.com]
data.azurerm_virtual_network.vnetinfo: Reading...
data.azurerm_virtual_network.vnetinfo: Read complete after 1s [id=/subscriptions/9e22xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx/resourceGroups/vcloud-lab.com/providers/Microsoft.Network/virtualNetworks/vcloud_lab_global_vnet01]

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # azurerm_subnet.name["subnet-1"] will be created
  + resource "azurerm_subnet" "name" {
      + address_prefixes                               = [
          + "10.0.1.0/24",
        ]
      + default_outbound_access_enabled                = true
      + enforce_private_link_endpoint_network_policies = (known after apply)
      + enforce_private_link_service_network_policies  = (known after apply)
      + id                                             = (known after apply)
      + name                                           = "subnet-1"
      + private_endpoint_network_policies              = (known after apply)
      + private_endpoint_network_policies_enabled      = (known after apply)
      + private_link_service_network_policies_enabled  = (known after apply)
      + resource_group_name                            = "vcloud-lab.com"
      + virtual_network_name                           = "vcloud_lab_global_vnet01"
    }

  # azurerm_subnet.name["subnet-2"] will be created
  + resource "azurerm_subnet" "name" {
      + address_prefixes                               = [
          + "10.0.2.0/24",
        ]
      + default_outbound_access_enabled                = true
      + enforce_private_link_endpoint_network_policies = (known after apply)
      + enforce_private_link_service_network_policies  = (known after apply)
      + id                                             = (known after apply)
      + name                                           = "subnet-2"
      + private_endpoint_network_policies              = (known after apply)
      + private_endpoint_network_policies_enabled      = (known after apply)
      + private_link_service_network_policies_enabled  = (known after apply)
      + resource_group_name                            = "vcloud-lab.com"
      + virtual_network_name                           = "vcloud_lab_global_vnet01"
    }

  # azurerm_subnet.name["subnet-3"] will be created
  + resource "azurerm_subnet" "name" {
      + address_prefixes                               = [
          + "10.0.3.0/24",
        ]
      + default_outbound_access_enabled                = true
      + enforce_private_link_endpoint_network_policies = (known after apply)
      + enforce_private_link_service_network_policies  = (known after apply)
      + id                                             = (known after apply)
      + name                                           = "subnet-3"
      + private_endpoint_network_policies              = (known after apply)
      + private_endpoint_network_policies_enabled      = (known after apply)
      + private_link_service_network_policies_enabled  = (known after apply)
      + resource_group_name                            = "vcloud-lab.com"
      + virtual_network_name                           = "vcloud_lab_global_vnet01"
    }

Plan: 3 to add, 0 to change, 0 to destroy.

Changes to Outputs:
  + subnet_ids = {
      + subnet-1 = (known after apply)
      + subnet-2 = (known after apply)
      + subnet-3 = (known after apply)
    }
azurerm_subnet.name["subnet-2"]: Creating...
azurerm_subnet.name["subnet-3"]: Creating...
azurerm_subnet.name["subnet-1"]: Creating...
azurerm_subnet.name["subnet-1"]: Creation complete after 7s [id=/subscriptions/9e22xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx/resourceGroups/vcloud-lab.com/providers/Microsoft.Network/virtualNetworks/vcloud_lab_global_vnet01/subnets/subnet-1]
azurerm_subnet.name["subnet-2"]: Still creating... [10s elapsed]
azurerm_subnet.name["subnet-3"]: Still creating... [10s elapsed]
azurerm_subnet.name["subnet-2"]: Creation complete after 14s [id=/subscriptions/9e22xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx/resourceGroups/vcloud-lab.com/providers/Microsoft.Network/virtualNetworks/vcloud_lab_global_vnet01/subnets/subnet-2]
azurerm_subnet.name["subnet-3"]: Still creating... [20s elapsed]
azurerm_subnet.name["subnet-3"]: Creation complete after 20s [id=/subscriptions/9e22xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx/resourceGroups/vcloud-lab.com/providers/Microsoft.Network/virtualNetworks/vcloud_lab_global_vnet01/subnets/subnet-3]

Apply complete! Resources: 3 added, 0 changed, 0 destroyed.

Outputs:

subnet_ids = {
  "subnet-1" = "/subscriptions/9e22xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx/resourceGroups/vcloud-lab.com/providers/Microsoft.Network/virtualNetworks/vcloud_lab_global_vnet01/subnets/subnet-1"
  "subnet-2" = "/subscriptions/9e22xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx/resourceGroups/vcloud-lab.com/providers/Microsoft.Network/virtualNetworks/vcloud_lab_global_vnet01/subnets/subnet-2"
  "subnet-3" = "/subscriptions/9e22xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx/resourceGroups/vcloud-lab.com/providers/Microsoft.Network/virtualNetworks/vcloud_lab_global_vnet01/subnets/subnet-3"
}

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This post first appeared on Tales From Real IT System Administrators World And Non-production Environment, please read the originial post: here

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Terraform create Azure Virtual Network subnets from map of object and show name in the header

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