typhoon/azure/container-linux/kubernetes/controllers.tf

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# Discrete DNS records for each controller's private IPv4 for etcd usage
resource "azurerm_dns_a_record" "etcds" {
count = var.controller_count
resource_group_name = var.dns_zone_group
# DNS Zone name where record should be created
zone_name = var.dns_zone
# DNS record
name = format("%s-etcd%d", var.cluster_name, count.index)
ttl = 300
# private IPv4 address for etcd
records = [element(
azurerm_network_interface.controllers.*.private_ip_address,
count.index,
)]
}
locals {
# Channel for a Container Linux derivative
# coreos-stable -> Container Linux Stable
channel = element(split("-", var.os_image), 1)
}
# Controller availability set to spread controllers
resource "azurerm_availability_set" "controllers" {
resource_group_name = azurerm_resource_group.cluster.name
name = "${var.cluster_name}-controllers"
location = var.region
platform_fault_domain_count = 2
platform_update_domain_count = 4
managed = true
}
# Controller instances
resource "azurerm_virtual_machine" "controllers" {
count = var.controller_count
resource_group_name = azurerm_resource_group.cluster.name
name = "${var.cluster_name}-controller-${count.index}"
location = var.region
availability_set_id = azurerm_availability_set.controllers.id
vm_size = var.controller_type
# boot
storage_image_reference {
publisher = "CoreOS"
offer = "CoreOS"
sku = local.channel
version = "latest"
}
# storage
storage_os_disk {
name = "${var.cluster_name}-controller-${count.index}"
create_option = "FromImage"
caching = "ReadWrite"
disk_size_gb = var.disk_size
os_type = "Linux"
managed_disk_type = "Premium_LRS"
}
# network
network_interface_ids = [element(azurerm_network_interface.controllers.*.id, count.index)]
os_profile {
computer_name = "${var.cluster_name}-controller-${count.index}"
admin_username = "core"
custom_data = element(data.ct_config.controller-ignitions.*.rendered, count.index)
}
# Azure mandates setting an ssh_key, even though Ignition custom_data handles it too
os_profile_linux_config {
disable_password_authentication = true
ssh_keys {
path = "/home/core/.ssh/authorized_keys"
key_data = var.ssh_authorized_key
}
}
# lifecycle
delete_os_disk_on_termination = true
delete_data_disks_on_termination = true
lifecycle {
ignore_changes = [
storage_os_disk,
os_profile,
]
}
}
# Controller NICs with public and private IPv4
resource "azurerm_network_interface" "controllers" {
count = var.controller_count
resource_group_name = azurerm_resource_group.cluster.name
name = "${var.cluster_name}-controller-${count.index}"
location = azurerm_resource_group.cluster.location
network_security_group_id = azurerm_network_security_group.controller.id
ip_configuration {
name = "ip0"
subnet_id = azurerm_subnet.controller.id
private_ip_address_allocation = "dynamic"
# public IPv4
public_ip_address_id = element(azurerm_public_ip.controllers.*.id, count.index)
}
}
# Add controller NICs to the controller backend address pool
resource "azurerm_network_interface_backend_address_pool_association" "controllers" {
count = var.controller_count
network_interface_id = azurerm_network_interface.controllers[count.index].id
ip_configuration_name = "ip0"
backend_address_pool_id = azurerm_lb_backend_address_pool.controller.id
}
# Controller public IPv4 addresses
resource "azurerm_public_ip" "controllers" {
count = var.controller_count
resource_group_name = azurerm_resource_group.cluster.name
name = "${var.cluster_name}-controller-${count.index}"
location = azurerm_resource_group.cluster.location
sku = "Standard"
allocation_method = "Static"
}
# Controller Ignition configs
data "ct_config" "controller-ignitions" {
count = var.controller_count
content = element(
data.template_file.controller-configs.*.rendered,
count.index,
)
pretty_print = false
snippets = var.controller_clc_snippets
}
# Controller Container Linux configs
data "template_file" "controller-configs" {
count = var.controller_count
template = file("${path.module}/cl/controller.yaml.tmpl")
vars = {
# Cannot use cyclic dependencies on controllers or their DNS records
etcd_name = "etcd${count.index}"
etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
# etcd0=https://cluster-etcd0.example.com,etcd1=https://cluster-etcd1.example.com,...
etcd_initial_cluster = join(",", data.template_file.etcds.*.rendered)
kubeconfig = indent(10, module.bootstrap.kubeconfig-kubelet)
ssh_authorized_key = var.ssh_authorized_key
cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
cluster_domain_suffix = var.cluster_domain_suffix
}
}
data "template_file" "etcds" {
count = var.controller_count
template = "etcd$${index}=https://$${cluster_name}-etcd$${index}.$${dns_zone}:2380"
vars = {
index = count.index
cluster_name = var.cluster_name
dns_zone = var.dns_zone
}
}