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

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locals {
# coreos-stable -> Container Linux Stable
# flatcar-stable -> Flatcar Linux Stable
flavor = split("-", var.os_image)[0]
channel = split("-", var.os_image)[1]
}
# Workers scale set
resource "azurerm_linux_virtual_machine_scale_set" "workers" {
resource_group_name = var.resource_group_name
name = "${var.name}-worker"
location = var.region
sku = var.vm_type
instances = var.worker_count
# instance name prefix for instances in the set
computer_name_prefix = "${var.name}-worker"
single_placement_group = false
custom_data = base64encode(data.ct_config.worker-ignition.rendered)
# storage
os_disk {
storage_account_type = "Standard_LRS"
caching = "ReadWrite"
}
source_image_reference {
publisher = local.flavor == "flatcar" ? "Kinvolk" : "CoreOS"
offer = local.flavor == "flatcar" ? "flatcar-container-linux" : "CoreOS"
sku = local.channel
version = "latest"
}
# Gross hack just for Flatcar Linux
dynamic "plan" {
for_each = local.flavor == "flatcar" ? [1] : []
content {
name = local.channel
publisher = "kinvolk"
product = "flatcar-container-linux"
}
}
# Azure requires setting admin_ssh_key, though Ignition custom_data handles it too
admin_username = "core"
admin_ssh_key {
username = "core"
public_key = var.ssh_authorized_key
}
# network
network_interface {
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_mode = "Manual"
# eviction policy may only be set when priority is Spot
2019-11-14 08:44:02 +01:00
priority = var.priority
eviction_policy = var.priority == "Spot" ? "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 = "${var.name}-maintain-desired"
location = var.region
# autoscale
enabled = true
target_resource_id = azurerm_linux_virtual_machine_scale_set.workers.id
profile {
name = "default"
capacity {
minimum = var.worker_count
default = var.worker_count
maximum = var.worker_count
}
}
}
# Worker Ignition configs
data "ct_config" "worker-ignition" {
content = data.template_file.worker-config.rendered
pretty_print = false
snippets = var.clc_snippets
}
# Worker Container Linux configs
data "template_file" "worker-config" {
template = file("${path.module}/cl/worker.yaml")
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)
}
}