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Remove an IPv4 address from Azure clusters
* 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)
This commit is contained in:
Dalton Hubble
parent
24b7f31c55
commit
a4fab61066
@ -6,7 +6,6 @@ Notable changes between versions.
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### Azure
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* Rename `region` variable to `location` to align with Azure platform conventions
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* Configure the virtual network and subnets with IPv6 private address space
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* Change `host_cidr` variable (string) to a `network_cidr` object with `ipv4` and `ipv6` fields that list CIDR strings. Leave the variable unset to use the defaults. (**breaking**)
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* Add support for dual-stack Kubernetes Ingress Load Balancing
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@ -18,6 +17,8 @@ Notable changes between versions.
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* Configure controller nodes to have a public IPv6 address
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* Configure worker nodes to use outbound rules and the load balancer for SNAT
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* Extend network security rules to allow IPv6 traffic, analogous to IPv4
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* Rename `region` variable to `location` to align with Azure platform conventions ([#1469](https://github.com/poseidon/typhoon/pull/1469))
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* Reduce the number of public IPv4 addresses needed for the Azure load balancer ([#1470](https://github.com/poseidon/typhoon/pull/1470))
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```diff
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module "cluster" {
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@ -8,16 +8,14 @@ locals {
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# Discrete DNS records for each controller's private IPv4 for etcd usage
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resource "azurerm_dns_a_record" "etcds" {
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count = var.controller_count
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resource_group_name = var.dns_zone_group
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count = var.controller_count
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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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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 = format("%s-etcd%d", var.cluster_name, count.index)
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ttl = 300
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# private IPv4 address for etcd
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records = [azurerm_network_interface.controllers[count.index].private_ip_address]
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}
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@ -135,12 +133,20 @@ resource "azurerm_network_interface_security_group_association" "controllers" {
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}
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# Associate controller network interface with controller backend address pool
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resource "azurerm_network_interface_backend_address_pool_association" "controllers" {
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resource "azurerm_network_interface_backend_address_pool_association" "controllers-ipv4" {
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count = var.controller_count
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network_interface_id = azurerm_network_interface.controllers[count.index].id
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ip_configuration_name = "ipv4"
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backend_address_pool_id = azurerm_lb_backend_address_pool.controller.id
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backend_address_pool_id = azurerm_lb_backend_address_pool.controller-ipv4.id
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}
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resource "azurerm_network_interface_backend_address_pool_association" "controllers-ipv6" {
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count = var.controller_count
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network_interface_id = azurerm_network_interface.controllers[count.index].id
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ip_configuration_name = "ipv6"
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backend_address_pool_id = azurerm_lb_backend_address_pool.controller-ipv6.id
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}
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# Fedora CoreOS controllers
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@ -1,30 +1,30 @@
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# DNS record for the apiserver load balancer
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# DNS A record for the apiserver load balancer
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resource "azurerm_dns_a_record" "apiserver" {
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resource_group_name = var.dns_zone_group
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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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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.apiserver-ipv4.ip_address]
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records = [azurerm_public_ip.frontend-ipv4.ip_address]
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}
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# Static IPv4 address for the apiserver frontend
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resource "azurerm_public_ip" "apiserver-ipv4" {
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name = "${var.cluster_name}-apiserver-ipv4"
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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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allocation_method = "Static"
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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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# IPv4 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 ingress frontend
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resource "azurerm_public_ip" "ingress-ipv4" {
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name = "${var.cluster_name}-ingress-ipv4"
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# Static IPv4 address for the load balancer
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resource "azurerm_public_ip" "frontend-ipv4" {
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name = "${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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@ -32,9 +32,9 @@ resource "azurerm_public_ip" "ingress-ipv4" {
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allocation_method = "Static"
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}
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# Static IPv6 address for the ingress frontend
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resource "azurerm_public_ip" "ingress-ipv6" {
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name = "${var.cluster_name}-ingress-ipv6"
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# Static IPv6 address for the load balancer
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resource "azurerm_public_ip" "frontend-ipv6" {
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name = "${var.cluster_name}-frontend-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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@ -50,38 +50,46 @@ resource "azurerm_lb" "cluster" {
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sku = "Standard"
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frontend_ip_configuration {
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name = "apiserver"
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public_ip_address_id = azurerm_public_ip.apiserver-ipv4.id
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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 = "ingress-ipv4"
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public_ip_address_id = azurerm_public_ip.ingress-ipv4.id
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}
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frontend_ip_configuration {
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name = "ingress-ipv6"
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public_ip_address_id = azurerm_public_ip.ingress-ipv6.id
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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" {
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name = "apiserver"
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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 = "apiserver"
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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.id]
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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 = "ingress-ipv4"
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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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@ -94,7 +102,7 @@ resource "azurerm_lb_rule" "ingress-http-ipv4" {
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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 = "ingress-ipv4"
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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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@ -107,7 +115,7 @@ resource "azurerm_lb_rule" "ingress-https-ipv4" {
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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 = "ingress-ipv6"
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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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@ -120,7 +128,7 @@ resource "azurerm_lb_rule" "ingress-http-ipv6" {
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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 = "ingress-ipv6"
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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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@ -133,8 +141,13 @@ resource "azurerm_lb_rule" "ingress-https-ipv6" {
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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" {
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name = "controller"
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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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@ -182,7 +195,7 @@ resource "azurerm_lb_outbound_rule" "outbound-ipv4" {
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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 = "ingress-ipv4"
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name = "frontend-ipv4"
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}
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}
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@ -192,6 +205,6 @@ resource "azurerm_lb_outbound_rule" "outbound-ipv6" {
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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 = "ingress-ipv6"
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name = "frontend-ipv6"
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}
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}
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@ -6,12 +6,12 @@ output "kubeconfig-admin" {
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# Outputs for Kubernetes Ingress
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output "ingress_static_ipv4" {
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value = azurerm_public_ip.ingress-ipv4.ip_address
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value = azurerm_public_ip.frontend-ipv4.ip_address
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description = "IPv4 address of the load balancer for distributing traffic to Ingress controllers"
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}
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output "ingress_static_ipv6" {
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value = azurerm_public_ip.ingress-ipv6.ip_address
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value = azurerm_public_ip.frontend-ipv6.ip_address
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description = "IPv6 address of the load balancer for distributing traffic to Ingress controllers"
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}
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@ -14,16 +14,14 @@ locals {
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# Discrete DNS records for each controller's private IPv4 for etcd usage
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resource "azurerm_dns_a_record" "etcds" {
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count = var.controller_count
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resource_group_name = var.dns_zone_group
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count = var.controller_count
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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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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 = format("%s-etcd%d", var.cluster_name, count.index)
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ttl = 300
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# private IPv4 address for etcd
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records = [azurerm_network_interface.controllers[count.index].private_ip_address]
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}
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@ -156,13 +154,21 @@ resource "azurerm_network_interface_security_group_association" "controllers" {
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network_security_group_id = azurerm_network_security_group.controller.id
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}
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# Associate controller network interface with controller backend address pool
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resource "azurerm_network_interface_backend_address_pool_association" "controllers" {
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# Associate controller network interface with controller backend address pools
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resource "azurerm_network_interface_backend_address_pool_association" "controllers-ipv4" {
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count = var.controller_count
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network_interface_id = azurerm_network_interface.controllers[count.index].id
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ip_configuration_name = "ipv4"
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backend_address_pool_id = azurerm_lb_backend_address_pool.controller.id
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backend_address_pool_id = azurerm_lb_backend_address_pool.controller-ipv4.id
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}
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resource "azurerm_network_interface_backend_address_pool_association" "controllers-ipv6" {
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count = var.controller_count
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network_interface_id = azurerm_network_interface.controllers[count.index].id
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ip_configuration_name = "ipv6"
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backend_address_pool_id = azurerm_lb_backend_address_pool.controller-ipv6.id
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}
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# Flatcar Linux controllers
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@ -1,30 +1,30 @@
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# DNS record for the apiserver load balancer
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# DNS A record for the apiserver load balancer
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resource "azurerm_dns_a_record" "apiserver" {
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resource_group_name = var.dns_zone_group
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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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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.apiserver-ipv4.ip_address]
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records = [azurerm_public_ip.frontend-ipv4.ip_address]
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}
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# Static IPv4 address for the apiserver frontend
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resource "azurerm_public_ip" "apiserver-ipv4" {
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name = "${var.cluster_name}-apiserver-ipv4"
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resource_group_name = azurerm_resource_group.cluster.name
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location = var.location
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sku = "Standard"
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allocation_method = "Static"
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# DNS AAAA record for the apiserver load balancer
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resource "azurerm_dns_aaaa_record" "apiserver" {
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# DNS Zone name where record should be created
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zone_name = var.dns_zone
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resource_group_name = var.dns_zone_group
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# DNS record
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name = var.cluster_name
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ttl = 300
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# IPv6 address of apiserver load balancer
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records = [azurerm_public_ip.frontend-ipv6.ip_address]
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}
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# Static IPv4 address for the ingress frontend
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resource "azurerm_public_ip" "ingress-ipv4" {
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name = "${var.cluster_name}-ingress-ipv4"
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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 = "${var.cluster_name}-frontend-ipv4"
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resource_group_name = azurerm_resource_group.cluster.name
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location = var.location
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ip_version = "IPv4"
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@ -32,8 +32,8 @@ resource "azurerm_public_ip" "ingress-ipv4" {
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allocation_method = "Static"
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}
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# Static IPv6 address for the ingress frontend
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resource "azurerm_public_ip" "ingress-ipv6" {
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# Static IPv6 address for the load balancer
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resource "azurerm_public_ip" "frontend-ipv6" {
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name = "${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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@ -50,38 +50,46 @@ resource "azurerm_lb" "cluster" {
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sku = "Standard"
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frontend_ip_configuration {
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name = "apiserver"
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public_ip_address_id = azurerm_public_ip.apiserver-ipv4.id
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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 = "ingress-ipv4"
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public_ip_address_id = azurerm_public_ip.ingress-ipv4.id
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}
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frontend_ip_configuration {
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name = "ingress-ipv6"
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public_ip_address_id = azurerm_public_ip.ingress-ipv6.id
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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" {
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name = "apiserver"
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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 = "apiserver"
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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.id]
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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" {
|
||||
name = "apiserver-ipv6"
|
||||
loadbalancer_id = azurerm_lb.cluster.id
|
||||
frontend_ip_configuration_name = "frontend-ipv6"
|
||||
disable_outbound_snat = true
|
||||
|
||||
protocol = "Tcp"
|
||||
frontend_port = 6443
|
||||
backend_port = 6443
|
||||
backend_address_pool_ids = [azurerm_lb_backend_address_pool.controller-ipv6.id]
|
||||
probe_id = azurerm_lb_probe.apiserver.id
|
||||
}
|
||||
|
||||
resource "azurerm_lb_rule" "ingress-http-ipv4" {
|
||||
name = "ingress-http-ipv4"
|
||||
loadbalancer_id = azurerm_lb.cluster.id
|
||||
frontend_ip_configuration_name = "ingress-ipv4"
|
||||
frontend_ip_configuration_name = "frontend-ipv4"
|
||||
disable_outbound_snat = true
|
||||
|
||||
protocol = "Tcp"
|
||||
@ -94,7 +102,7 @@ resource "azurerm_lb_rule" "ingress-http-ipv4" {
|
||||
resource "azurerm_lb_rule" "ingress-https-ipv4" {
|
||||
name = "ingress-https-ipv4"
|
||||
loadbalancer_id = azurerm_lb.cluster.id
|
||||
frontend_ip_configuration_name = "ingress-ipv4"
|
||||
frontend_ip_configuration_name = "frontend-ipv4"
|
||||
disable_outbound_snat = true
|
||||
|
||||
protocol = "Tcp"
|
||||
@ -107,7 +115,7 @@ resource "azurerm_lb_rule" "ingress-https-ipv4" {
|
||||
resource "azurerm_lb_rule" "ingress-http-ipv6" {
|
||||
name = "ingress-http-ipv6"
|
||||
loadbalancer_id = azurerm_lb.cluster.id
|
||||
frontend_ip_configuration_name = "ingress-ipv6"
|
||||
frontend_ip_configuration_name = "frontend-ipv6"
|
||||
disable_outbound_snat = true
|
||||
|
||||
protocol = "Tcp"
|
||||
@ -120,7 +128,7 @@ resource "azurerm_lb_rule" "ingress-http-ipv6" {
|
||||
resource "azurerm_lb_rule" "ingress-https-ipv6" {
|
||||
name = "ingress-https-ipv6"
|
||||
loadbalancer_id = azurerm_lb.cluster.id
|
||||
frontend_ip_configuration_name = "ingress-ipv6"
|
||||
frontend_ip_configuration_name = "frontend-ipv6"
|
||||
disable_outbound_snat = true
|
||||
|
||||
protocol = "Tcp"
|
||||
@ -133,8 +141,13 @@ resource "azurerm_lb_rule" "ingress-https-ipv6" {
|
||||
# Backend Address Pools
|
||||
|
||||
# Address pool of controllers
|
||||
resource "azurerm_lb_backend_address_pool" "controller" {
|
||||
name = "controller"
|
||||
resource "azurerm_lb_backend_address_pool" "controller-ipv4" {
|
||||
name = "controller-ipv4"
|
||||
loadbalancer_id = azurerm_lb.cluster.id
|
||||
}
|
||||
|
||||
resource "azurerm_lb_backend_address_pool" "controller-ipv6" {
|
||||
name = "controller-ipv6"
|
||||
loadbalancer_id = azurerm_lb.cluster.id
|
||||
}
|
||||
|
||||
@ -182,7 +195,7 @@ resource "azurerm_lb_outbound_rule" "outbound-ipv4" {
|
||||
loadbalancer_id = azurerm_lb.cluster.id
|
||||
backend_address_pool_id = azurerm_lb_backend_address_pool.worker-ipv4.id
|
||||
frontend_ip_configuration {
|
||||
name = "ingress-ipv4"
|
||||
name = "frontend-ipv4"
|
||||
}
|
||||
}
|
||||
|
||||
@ -192,6 +205,6 @@ resource "azurerm_lb_outbound_rule" "outbound-ipv6" {
|
||||
loadbalancer_id = azurerm_lb.cluster.id
|
||||
backend_address_pool_id = azurerm_lb_backend_address_pool.worker-ipv6.id
|
||||
frontend_ip_configuration {
|
||||
name = "ingress-ipv6"
|
||||
name = "frontend-ipv6"
|
||||
}
|
||||
}
|
||||
|
||||
@ -6,12 +6,12 @@ output "kubeconfig-admin" {
|
||||
# Outputs for Kubernetes Ingress
|
||||
|
||||
output "ingress_static_ipv4" {
|
||||
value = azurerm_public_ip.ingress-ipv4.ip_address
|
||||
value = azurerm_public_ip.frontend-ipv4.ip_address
|
||||
description = "IPv4 address of the load balancer for distributing traffic to Ingress controllers"
|
||||
}
|
||||
|
||||
output "ingress_static_ipv6" {
|
||||
value = azurerm_public_ip.ingress-ipv6.ip_address
|
||||
value = azurerm_public_ip.frontend-ipv6.ip_address
|
||||
description = "IPv6 address of the load balancer for distributing traffic to Ingress controllers"
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user