Fixes for Hetzner terraform and Hetzner Cloud (#8702)

* - add ability to specify the network_zone in hetzner terraform
- Export the network id from hetzner terraform the the generated inventory.ini

* - Add with_networks variable to allow different deployments of hcloud controller manager

- Add network id to hcloud controller secret (added via the inventory)

- Don't include extra_args if it's not set

contrib/terraform/hetzner/README.md

@@ -97,6 +97,7 @@ terraform destroy --var-file default.tfvars ../../contrib/terraform/hetzner
 * `prefix`: Prefix to add to all resources, if set to "" don't set any prefix
 * `ssh_public_keys`: List of public SSH keys to install on all machines
 * `zone`: The zone where to run the cluster
+* `network_zone`: the network zone where the cluster is running
 * `machines`: Machines to provision. Key of this object will be used as the name of the machine
   * `node_type`: The role of this node *(master|worker)*
   * `size`: Size of the VM

contrib/terraform/hetzner/default.tfvars

@@ -1,6 +1,6 @@
 prefix = "default"
 zone   = "hel1"
-
+network_zone = "eu-central"
 inventory_file = "inventory.ini"
 
 ssh_public_keys = [

contrib/terraform/hetzner/main.tf

@@ -10,6 +10,7 @@ module "kubernetes" {
   machines = var.machines
 
   ssh_public_keys = var.ssh_public_keys
+  network_zone = var.network_zone
 
   ssh_whitelist        = var.ssh_whitelist
   api_server_whitelist = var.api_server_whitelist
@@ -34,9 +35,9 @@ data "template_file" "inventory" {
       keys(module.kubernetes.worker_ip_addresses),
       values(module.kubernetes.worker_ip_addresses).*.public_ip,
     values(module.kubernetes.worker_ip_addresses).*.private_ip))
-
     list_master = join("\n", keys(module.kubernetes.master_ip_addresses))
     list_worker = join("\n", keys(module.kubernetes.worker_ip_addresses))
+    network_id = module.kubernetes.network_id
   }
 }
 

contrib/terraform/hetzner/modules/kubernetes-cluster/main.tf

@@ -6,7 +6,7 @@ resource "hcloud_network" "kubernetes" {
 resource "hcloud_network_subnet" "kubernetes" {
   type         = "cloud"
   network_id   = hcloud_network.kubernetes.id
-  network_zone = "eu-central"
+  network_zone = var.network_zone
   ip_range     = var.private_subnet_cidr
 }
 

contrib/terraform/hetzner/modules/kubernetes-cluster/output.tf

@@ -21,3 +21,7 @@ output "worker_ip_addresses" {
 output "cluster_private_network_cidr" {
   value = var.private_subnet_cidr
 }
+
+output "network_id" {
+  value = hcloud_network.kubernetes.id
+}

contrib/terraform/hetzner/modules/kubernetes-cluster/variables.tf

@@ -39,3 +39,6 @@ variable "private_network_cidr" {
 variable "private_subnet_cidr" {
   default = "10.0.10.0/24"
 }
+variable "network_zone" {
+  default = "eu-central"
+}

contrib/terraform/hetzner/templates/inventory.tpl

@@ -14,3 +14,6 @@ ${list_worker}
 [k8s-cluster:children]
 kube-master
 kube-node
+
+[k8s-cluster:vars]
+network_id=${network_id}

contrib/terraform/hetzner/variables.tf

@@ -1,6 +1,10 @@
 variable "zone" {
   description = "The zone where to run the cluster"
 }
+variable "network_zone" {
+  description = "The network zone where the cluster is running"
+  default = "eu-central"
+}
 
 variable "prefix" {
   description = "Prefix for resource names"