The architecture depicted in the picture is a multi-region setup in Azure, utilizing load balancers, firewalls, availability sets, and virtual networks to create a resilient and scalable network infrastructure for hosting virtual machines.
The Terraform resources needed for the architecture mentioned are: - azurerm_resource_group - azurerm_virtual_network - azurerm_subnet - azurerm_public_ip - azurerm_firewall - azurerm_lb - azurerm_availability_set These resources are used to create the network infrastructure, public IP, firewall, load balancer, and availability sets in Azure.
Below is an example of how you might start writing Terraform code for part of this Azure setup. This example will create the basic network infrastructure in one region, which you can then duplicate and modify for the second region.
provider "azurerm" {
features {}
}
# Create a resource group
resource "azurerm_resource_group" "example" {
name = "example-resources"
location = "West Europe"
}
# Create a virtual network
resource "azurerm_virtual_network" "example" {
name = "example-network"
address_space = ["10.0.0.0/16"]
location = azurerm_resource_group.example.location
resource_group_name = azurerm_resource_group.example.name
}
# Create a subnet
resource "azurerm_subnet" "example" {
name = "internal"
resource_group_name = azurerm_resource_group.example.name
virtual_network_name = azurerm_virtual_network.example.name
address_prefixes = ["10.0.2.0/24"]
}
# Create a public IP for the firewall
resource "azurerm_public_ip" "example" {
name = "example-firewall-public-ip"
location = azurerm_resource_group.example.location
resource_group_name = azurerm_resource_group.example.name
allocation_method = "Static"
sku = "Standard"
}
# Create an Azure Firewall
resource "azurerm_firewall" "example" {
name = "example-firewall"
location = azurerm_resource_group.example.location
resource_group_name = azurerm_resource_group.example.name
ip_configuration {
name = "configuration"
subnet_id = azurerm_subnet.example.id
public_ip_address_id = azurerm_public_ip.example.id
}
}
# Create a Load Balancer
resource "azurerm_lb" "example" {
name = "example-lb"
location = azurerm_resource_group.example.location
resource_group_name = azurerm_resource_group.example.name
sku = "Standard"
frontend_ip_configuration {
name = "publicIPAddress"
public_ip_address_id = azurerm_public_ip.example.id
}
}
# Create Availability Sets
resource "azurerm_availability_set" "example_a" {
name = "example-availability-set-a"
location = azurerm_resource_group.example.location
resource_group_name = azurerm_resource_group.example.name
platform_fault_domain_count = 2
platform_update_domain_count = 5
}
resource "azurerm_availability_set" "example_b" {
name = "example-availability-set-b"
location = azurerm_resource_group.example.location
resource_group_name = azurerm_resource_group.example.name
platform_fault_domain_count = 2
platform_update_domain_count = 5
}
# ... You would continue by creating VMs within these availability sets and setting up NAT rules, etc.
This code is a simplified version and only covers the creation of the network, public IP, firewall, load balancer, and availability sets. You would need to add more details, such as network security groups, NAT rules, and actual VMs. Moreover, for a full multi-region setup, you would duplicate and modify the required parts of the configuration for the second region.
For the Azure Traffic Manager setup, you would also create a Terraform resource but you need to have the endpoints defined, which would be the public IP addresses of your load balancers in both regions.
Keep in mind that for the actual VMs, you would need to specify the image, size, network interface, OS disk, and potentially additional data disks or extensions. You would also define the application gateway if you want to use it for routing HTTP requests.
This code is a starting point and you'll need to expand upon it to fully replicate the architecture depicted.