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

118 lines
3.0 KiB
HCL

locals {
# Channel for a Container Linux derivative
# coreos-stable -> Container Linux Stable
channel = element(split("-", var.os_image), 1)
}
# Workers scale set
resource "azurerm_virtual_machine_scale_set" "workers" {
resource_group_name = var.resource_group_name
name = "${var.name}-workers"
location = var.region
single_placement_group = false
sku {
name = var.vm_type
tier = "standard"
capacity = var.worker_count
}
# boot
storage_profile_image_reference {
publisher = "CoreOS"
offer = "CoreOS"
sku = local.channel
version = "latest"
}
# storage
storage_profile_os_disk {
create_option = "FromImage"
caching = "ReadWrite"
os_type = "linux"
managed_disk_type = "Standard_LRS"
}
os_profile {
computer_name_prefix = "${var.name}-worker-"
admin_username = "core"
custom_data = data.ct_config.worker-ignition.rendered
}
# 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
}
}
# network
network_profile {
name = "nic0"
primary = true
network_security_group_id = var.security_group_id
ip_configuration {
name = "ip0"
primary = true
subnet_id = var.subnet_id
# backend address pool to which the NIC should be added
load_balancer_backend_address_pool_ids = [var.backend_address_pool_id]
}
}
# lifecycle
upgrade_policy_mode = "Manual"
# eviction policy may only be set when priority is Low
priority = var.priority
eviction_policy = var.priority == "Low" ? "Delete" : null
}
# Scale up or down to maintain desired number, tolerating deallocations.
resource "azurerm_monitor_autoscale_setting" "workers" {
resource_group_name = var.resource_group_name
name = "${var.name}-maintain-desired"
location = var.region
# autoscale
enabled = true
target_resource_id = azurerm_virtual_machine_scale_set.workers.id
profile {
name = "default"
capacity {
minimum = var.worker_count
default = var.worker_count
maximum = var.worker_count
}
}
}
# Worker Ignition configs
data "ct_config" "worker-ignition" {
content = data.template_file.worker-config.rendered
pretty_print = false
snippets = var.clc_snippets
}
# Worker Container Linux configs
data "template_file" "worker-config" {
template = file("${path.module}/cl/worker.yaml.tmpl")
vars = {
kubeconfig = indent(10, var.kubeconfig)
ssh_authorized_key = var.ssh_authorized_key
cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
cluster_domain_suffix = var.cluster_domain_suffix
node_labels = join(",", var.node_labels)
}
}