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 = "${var.ssh_authorized_key}"
}
}
# lifecycle
delete_os_disk_on_termination = true
delete_data_disks_on_termination = true
lifecycle {
ignore_changes = [
"storage_os_disk",
]
}
}
# Controller NICs with public and private IPv4
resource "azurerm_network_interface" "controllers" {
count = "${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 = "${element(azurerm_public_ip.controllers.*.id, count.index)}"
# backend address pool to which the NIC should be added
load_balancer_backend_address_pools_ids = ["${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 = "${azurerm_resource_group.cluster.location}"
sku = "Standard"
public_ip_address_allocation = "static"
}
# Controller Ignition configs
data "ct_config" "controller-ignitions" {
count = "${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 = "${indent(10, module.bootkube.kubeconfig)}"
ssh_authorized_key = "${var.ssh_authorized_key}"
k8s_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}"
}
}