format and partition data disk

support only one data disk for now

files/cloud_init.cfg.tftpl

@@ -33,3 +33,19 @@ runcmd:
 - dhclient -r
 - dhclient
 - locale-gen
+%{ if data_disk }
+device_aliases:
+  data: /dev/vdb
+disk_setup:
+  data:
+    table_type: 'gpt'
+    layout: true
+    overwrite: false
+fs_setup:
+  - label: 'data'
+    filesystem: 'ext4'
+    device: data.1
+    overwrite: false
+mounts:
+- ["data.1", "/mnt/data"]
+%{ endif }

main.tf

@@ -13,7 +13,8 @@ locals {
     insecure_password     = var.insecure_password,
     use_host_cert         = var.use_host_cert,
     host_cert             = trimspace(null_resource.cert.triggers["cert"]),
-    private_key           = tls_private_key.debian.private_key_openssh
+    private_key           = tls_private_key.debian.private_key_openssh,
+    data_disk             = var.data_disk != null
   })
 }
 
@@ -79,9 +80,9 @@ resource "libvirt_domain" "debian" {
   }
 
   dynamic "disk" {
-    for_each = var.data_disks
+    for_each = var.data_disk != null ? [1] : []
     content {
-      volume_id = disk.value
+      volume_id = var.data_disk
     }
   }
 

variables.tf

@@ -55,7 +55,7 @@ variable "ca_host" {
   type = string
 }
 
-variable "data_disks" {
+variable "data_disk" {
-  type = list(string)
+  type = string
-  default = []
+  default = null
 }