Create Azure VNET, Subnet and NSG With Terraform

This Terraform configuration code will show how to create a Virtual Network (VNET), Subnet and a Network Security Group (NSG) with Terraform.

Terraform Configuration

The following configuration creates the following:

• Resource Group in the west us region
• Network Security Group (NSG) with port 22
• Virtual Network with address space of 172.0.0.0/16
• Subnet with address space of 172.0.1.0/24

resource "azurerm_resource_group" "rg" {
  name     = "TF-LAN"
  location =  "west-us"  
}

resource "azurerm_network_security_group" "nsg" {
  name                = "TF-LAN-NSG-1"
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name

  security_rule {
    name                       = "ssh"
    priority                   = 100
    direction                  = "Inbound"
    access                     = "Allow"
    protocol                   = "Tcp"
    source_port_range          = "*"
    destination_port_range     = "22"
    source_address_prefix      = "*"
    destination_address_prefix = "*"
  }

}

resource "azurerm_virtual_network" "vnet-1" {
  name                = "TF-LAN-VNET-1"
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name
  address_space       = ["172.0.0.0/16"]
 
}

resource "azurerm_subnet" "server-subnet-1" {
  name                 = "internal"
  resource_group_name  = azurerm_resource_group.rg.name
  virtual_network_name = azurerm_virtual_network.vnet-1.name
  address_prefixes     = ["172.0.1.0/24"]
}

Note: If you need to use custom DNS servers for your VNET, add the following line to the azurerm_virtual_network block.

dns_servers   = ["10.0.0.4", "10.0.0.5"]