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a4fab61066
* Consolidate load balancer frontend IPs to just the minimal IPv4 and IPv6 addresses that are needed per load balancer. apiserver and ingress use separate ports, so there is not a true need for a separate public IPv4 address just for apiserver * Some might prefer a separate IP just because it slightly hides the apiserver, but these are public hosted endpoints that can be discovered * Reduce the cost of an Azure cluster since IPv4 public IPs are billed ($3.60/mo/cluster)
211 lines
6.7 KiB
HCL
211 lines
6.7 KiB
HCL
# DNS A record for the apiserver load balancer
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resource "azurerm_dns_a_record" "apiserver" {
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# DNS Zone name where record should be created
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zone_name = var.dns_zone
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resource_group_name = var.dns_zone_group
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# DNS record
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name = var.cluster_name
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ttl = 300
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# IPv4 address of apiserver load balancer
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records = [azurerm_public_ip.frontend-ipv4.ip_address]
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}
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# DNS AAAA record for the apiserver load balancer
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resource "azurerm_dns_aaaa_record" "apiserver" {
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# DNS Zone name where record should be created
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zone_name = var.dns_zone
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resource_group_name = var.dns_zone_group
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# DNS record
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name = var.cluster_name
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ttl = 300
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# IPv6 address of apiserver load balancer
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records = [azurerm_public_ip.frontend-ipv6.ip_address]
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}
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# Static IPv4 address for the load balancer
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resource "azurerm_public_ip" "frontend-ipv4" {
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name = "${var.cluster_name}-frontend-ipv4"
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resource_group_name = azurerm_resource_group.cluster.name
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location = var.location
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ip_version = "IPv4"
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sku = "Standard"
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allocation_method = "Static"
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}
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# Static IPv6 address for the load balancer
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resource "azurerm_public_ip" "frontend-ipv6" {
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name = "${var.cluster_name}-ingress-ipv6"
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resource_group_name = azurerm_resource_group.cluster.name
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location = var.location
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ip_version = "IPv6"
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sku = "Standard"
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allocation_method = "Static"
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}
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# Network Load Balancer for apiservers and ingress
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resource "azurerm_lb" "cluster" {
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name = var.cluster_name
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resource_group_name = azurerm_resource_group.cluster.name
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location = var.location
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sku = "Standard"
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frontend_ip_configuration {
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name = "frontend-ipv4"
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public_ip_address_id = azurerm_public_ip.frontend-ipv4.id
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}
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frontend_ip_configuration {
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name = "frontend-ipv6"
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public_ip_address_id = azurerm_public_ip.frontend-ipv6.id
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}
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}
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resource "azurerm_lb_rule" "apiserver-ipv4" {
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name = "apiserver-ipv4"
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loadbalancer_id = azurerm_lb.cluster.id
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frontend_ip_configuration_name = "frontend-ipv4"
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disable_outbound_snat = true
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protocol = "Tcp"
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frontend_port = 6443
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backend_port = 6443
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backend_address_pool_ids = [azurerm_lb_backend_address_pool.controller-ipv4.id]
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probe_id = azurerm_lb_probe.apiserver.id
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}
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resource "azurerm_lb_rule" "apiserver-ipv6" {
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name = "apiserver-ipv6"
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loadbalancer_id = azurerm_lb.cluster.id
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frontend_ip_configuration_name = "frontend-ipv6"
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disable_outbound_snat = true
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protocol = "Tcp"
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frontend_port = 6443
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backend_port = 6443
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backend_address_pool_ids = [azurerm_lb_backend_address_pool.controller-ipv6.id]
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probe_id = azurerm_lb_probe.apiserver.id
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}
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resource "azurerm_lb_rule" "ingress-http-ipv4" {
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name = "ingress-http-ipv4"
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loadbalancer_id = azurerm_lb.cluster.id
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frontend_ip_configuration_name = "frontend-ipv4"
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disable_outbound_snat = true
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protocol = "Tcp"
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frontend_port = 80
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backend_port = 80
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backend_address_pool_ids = [azurerm_lb_backend_address_pool.worker-ipv4.id]
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probe_id = azurerm_lb_probe.ingress.id
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}
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resource "azurerm_lb_rule" "ingress-https-ipv4" {
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name = "ingress-https-ipv4"
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loadbalancer_id = azurerm_lb.cluster.id
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frontend_ip_configuration_name = "frontend-ipv4"
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disable_outbound_snat = true
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protocol = "Tcp"
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frontend_port = 443
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backend_port = 443
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backend_address_pool_ids = [azurerm_lb_backend_address_pool.worker-ipv4.id]
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probe_id = azurerm_lb_probe.ingress.id
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}
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resource "azurerm_lb_rule" "ingress-http-ipv6" {
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name = "ingress-http-ipv6"
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loadbalancer_id = azurerm_lb.cluster.id
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frontend_ip_configuration_name = "frontend-ipv6"
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disable_outbound_snat = true
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protocol = "Tcp"
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frontend_port = 80
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backend_port = 80
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backend_address_pool_ids = [azurerm_lb_backend_address_pool.worker-ipv6.id]
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probe_id = azurerm_lb_probe.ingress.id
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}
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resource "azurerm_lb_rule" "ingress-https-ipv6" {
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name = "ingress-https-ipv6"
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loadbalancer_id = azurerm_lb.cluster.id
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frontend_ip_configuration_name = "frontend-ipv6"
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disable_outbound_snat = true
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protocol = "Tcp"
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frontend_port = 443
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backend_port = 443
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backend_address_pool_ids = [azurerm_lb_backend_address_pool.worker-ipv6.id]
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probe_id = azurerm_lb_probe.ingress.id
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}
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# Backend Address Pools
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# Address pool of controllers
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resource "azurerm_lb_backend_address_pool" "controller-ipv4" {
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name = "controller-ipv4"
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loadbalancer_id = azurerm_lb.cluster.id
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}
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resource "azurerm_lb_backend_address_pool" "controller-ipv6" {
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name = "controller-ipv6"
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loadbalancer_id = azurerm_lb.cluster.id
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}
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# Address pools for workers
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resource "azurerm_lb_backend_address_pool" "worker-ipv4" {
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name = "worker-ipv4"
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loadbalancer_id = azurerm_lb.cluster.id
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}
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resource "azurerm_lb_backend_address_pool" "worker-ipv6" {
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name = "worker-ipv6"
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loadbalancer_id = azurerm_lb.cluster.id
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}
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# Health checks / probes
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# TCP health check for apiserver
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resource "azurerm_lb_probe" "apiserver" {
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name = "apiserver"
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loadbalancer_id = azurerm_lb.cluster.id
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protocol = "Tcp"
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port = 6443
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# unhealthy threshold
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number_of_probes = 3
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interval_in_seconds = 5
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}
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# HTTP health check for ingress
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resource "azurerm_lb_probe" "ingress" {
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name = "ingress"
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loadbalancer_id = azurerm_lb.cluster.id
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protocol = "Http"
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port = 10254
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request_path = "/healthz"
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# unhealthy threshold
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number_of_probes = 3
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interval_in_seconds = 5
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}
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# Outbound SNAT
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resource "azurerm_lb_outbound_rule" "outbound-ipv4" {
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name = "outbound-ipv4"
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protocol = "All"
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loadbalancer_id = azurerm_lb.cluster.id
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backend_address_pool_id = azurerm_lb_backend_address_pool.worker-ipv4.id
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frontend_ip_configuration {
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name = "frontend-ipv4"
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}
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}
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resource "azurerm_lb_outbound_rule" "outbound-ipv6" {
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name = "outbound-ipv6"
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protocol = "All"
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loadbalancer_id = azurerm_lb.cluster.id
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backend_address_pool_id = azurerm_lb_backend_address_pool.worker-ipv6.id
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frontend_ip_configuration {
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name = "frontend-ipv6"
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}
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}
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