This Terraform module creates a standardised load balancer and availability set.
Refer to the variables.tf for a full list of the possible options and default values.
Note that if the load_balancer rules list is not specified then it will default to a NAT rule passing 443 (HTTPS) through to the 443 port on the backend.
resource "azurerm_resource_group" "example" {
name = "lb-example"
location = "West Europe"
tags = {
owner = "Richard Cheney",
dept = "Azure Citadel"
}
}
resource "azurerm_virtual_network" "example" {
name = "example-vnet"
resource_group_name = azurerm_resource_group.example.name
location = azurerm_resource_group.example.location
tags = azurerm_resource_group.example.tags
address_space = ["10.0.0.0/24"]
}
resource "azurerm_subnet" "example" {
name = "example-subnet"
resource_group_name = azurerm_resource_group.example.name
virtual_network_name = azurerm_virtual_network.example.name
address_prefixes = ["10.0.0.0/26"]
}
module "example-lb" {
source = "https://github.com/terraform-azurerm-modules/terraform-azurerm-load-balancer"
name = "lb-example"
resource_group_name = azurerm_resource_group.example.name
location = azurerm_resource_group.example.location
tags = azurerm_resource_group.example.tags
subnet_id = azurerm_subnet.example.id
load_balancer_rules = [{
protocol = "Tcp",
frontend_port = 80,
backend_port = 8080
},
{
protocol = "Tcp",
frontend_port = 443,
backend_port = 8443
}
]
}
output "example_load_balancer_ip_address" {
value = module.example-lb.load_balancer_private_ip_address
}
output "example_availability_set_id" {
value = module.example-lb.availability_set_id
}
output "example_load_balancer_backend_address_pool_id" {
value = module.example-lb.load_balancer_backend_address_pool_id
}The real benefit of the module is that you can define a set of defaults and leverage that if you are creating many availability sets and load balancers.
See the example-hub and example-spoke repositories for fuller examples, including how the outputs are used by the terraform-azurerm-linux-vm and terraform-azurerm-linux-vmss modules.
<snip>
locals {
defaults = {
resource_group_name = azurerm_resource_group.example.name
location = azurerm_resource_group.example.location
tags = azurerm_resource_group.example.tags
subnet_id = azurerm_subnet.example.id
}
}
module "example-lb1" {
source = "https://github.com/terraform-azurerm-modules/terraform-azurerm-local-balancer"
defaults = locals.defaults
name = "lb-example1"
}
module "example-lb2" {
source = "https://github.com/terraform-azurerm-modules/terraform-azurerm-local-balancer"
defaults = locals.defaults
name = "lb-example2"
load_balancer_rules = [
{ protocol = "Tcp", frontend_port = 80, backend_port = 8080 },
{ protocol = "Tcp", frontend_port = 443, backend_port = 8443 }
]
}
module "example-lb3" {
source = "https://github.com/terraform-azurerm-modules/terraform-azurerm-local-balancer"
defaults = locals.defaults
name = "lb-example3"
subnet_id = azurerm_subnet.alternative.id
}
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