Add Longhorn and make it possible to enable/disable it and the hetzner csi

helm/longhorn.yaml

@@ -0,0 +1,22 @@
+---
+helmDefaults:
+  timeout: 3600
+  wait: true
+  force: false
+  atomic: true
+
+repositories:
+  - name: longhorn
+    url: https://charts.longhorn.io
+
+releases:
+  - name: longhorn
+    namespace: longhorn
+    chart: longhorn/longhorn
+    values:
+      - persistence:
+          defaultClass: true
+          defaultFsType: ext4
+          defaultClassReplicaCount: 2
+      - defaultSettings:
+          defaultDataPath: /var/longhorn

init.tf

@@ -80,18 +80,24 @@ resource "null_resource" "kustomization" {
     content = yamlencode({
       apiVersion = "kustomize.config.k8s.io/v1beta1"
       kind       = "Kustomization"
-      resources = concat([
+      resources = concat(
+        [
           "https://github.com/hetznercloud/hcloud-cloud-controller-manager/releases/download/${local.ccm_version}/ccm-networks.yaml",
-        "https://raw.githubusercontent.com/hetznercloud/csi-driver/${local.csi_version}/deploy/kubernetes/hcloud-csi.yml",
           "https://github.com/weaveworks/kured/releases/download/${local.kured_version}/kured-${local.kured_version}-dockerhub.yaml",
           "https://raw.githubusercontent.com/rancher/system-upgrade-controller/master/manifests/system-upgrade-controller.yaml",
-        ], local.is_single_node_cluster ? [] : var.traefik_enabled ? ["traefik_config.yaml"] : []
+        ],
-      , var.cni_plugin == "calico" ? ["https://projectcalico.docs.tigera.io/manifests/calico.yaml"] : []),
+        var.disable_hetzner_csi ? [] : ["https://raw.githubusercontent.com/hetznercloud/csi-driver/${local.csi_version}/deploy/kubernetes/hcloud-csi.yml"],
-      patchesStrategicMerge = concat([
+        local.is_single_node_cluster ? [] : var.traefik_enabled ? ["traefik_config.yaml"] : [],
+        var.cni_plugin == "calico" ? ["https://projectcalico.docs.tigera.io/manifests/calico.yaml"] : []
+      ),
+      patchesStrategicMerge = concat(
+        [
           file("${path.module}/kustomize/kured.yaml"),
           file("${path.module}/kustomize/ccm.yaml"),
           file("${path.module}/kustomize/system-upgrade-controller.yaml")
-      ], var.cni_plugin == "calico" ? [file("${path.module}/kustomize/calico.yaml")] : [])
+        ],
+        var.cni_plugin == "calico" ? [file("${path.module}/kustomize/calico.yaml")] : []
+      )
     })
     destination = "/var/post_install/kustomization.yaml"
   }
@@ -161,6 +167,27 @@ resource "null_resource" "kustomization" {
   }
 
   depends_on = [
-    null_resource.first_control_plane
+    null_resource.first_control_plane,
+    local_sensitive_file.kubeconfig
+  ]
+}
+
+resource "null_resource" "longhorn" {
+  # If longhorn isn't enabled, we don't want any Helm resources
+  count = var.enable_longhorn ? 1 : 0
+
+  # Install Helm charts
+  provisioner "local-exec" {
+    when       = create
+    command    = <<-EOT
+      export KUBECONFIG=$(readlink -f ${path.module}/kubeconfig.yaml)
+      helmfile -f ${path.module}/helm/longhorn.yaml apply
+    EOT
+    on_failure = continue
+  }
+
+  depends_on = [
+    null_resource.first_control_plane,
+    local_sensitive_file.kubeconfig
   ]
 }

modules/host/main.tf

@@ -69,7 +69,7 @@ resource "hcloud_server" "server" {
   provisioner "remote-exec" {
     inline = [
       "set -ex",
-      "transactional-update shell <<< 'rpm --import https://rpm.rancher.io/public.key;zypper install -y https://github.com/k3s-io/k3s-selinux/releases/download/v0.5.stable.1/k3s-selinux-0.5-1.sle.noarch.rpm'"
+      "transactional-update shell <<< 'rpm --import https://rpm.rancher.io/public.key; zypper install -y open-iscsi https://github.com/k3s-io/k3s-selinux/releases/download/v0.5.stable.1/k3s-selinux-0.5-1.sle.noarch.rpm'"
     ]
   }
 
@@ -84,6 +84,14 @@ resource "hcloud_server" "server" {
       done
     EOT
   }
+
+  # Enable open-iscsi
+  provisioner "remote-exec" {
+    inline = [
+      "set -ex",
+      "systemctl enable --now iscsid"
+    ]
+  }
 }
 
 resource "hcloud_server_network" "server" {

terraform.tfvars.example

@@ -103,6 +103,12 @@ load_balancer_location = "fsn1"
 
 ### The following values are entirely optional
 
+# To use local storage on the nodes, you can enable Longhorn, default is "false"
+# enable_longhorn = false
+
+# To disable Hetzner CSI storage, you can set the following to true, default is "false"
+# disable_hetzner_csi = false
+
 # If you want to use a specific Hetzner CCM and CSI version, set them below; otherwise, leave them as-is for the latest versions
 # hetzner_ccm_version = ""
 # hetzner_csi_version = ""

variables.tf

@@ -163,3 +163,15 @@ variable "cni_plugin" {
   default     = "flannel"
   description = "CNI plugin for k3s"
 }
+
+variable "enable_longhorn" {
+  type        = bool
+  default     = false
+  description = "Enable Longhorn"
+}
+
+variable "disable_hetzner_csi" {
+  type        = bool
+  default     = false
+  description = "Disable hetzner csi driver"
+}