support fixed ip address

files/network_config.cfg

@@ -1,7 +0,0 @@
-version: 2
-ethernets:
-  ens3:
-    dhcp4: true
-    routes:
-    - to: 0.0.0.0/0
-      via: 192.168.30.1

files/network_config.cfg.tftpl

@@ -0,0 +1,14 @@
+version: 2
+ethernets:
+  ens3:
+%{ if fixed_address }
+    dhcp4: false
+    addresses:
+      - "${fixed_address}"
+%{ else }
+    dhcp4: true
+%{ endif }
+    dhcp4: true
+    routes:
+    - to: 0.0.0.0/0
+      via: 192.168.30.1

main.tf

@@ -16,6 +16,9 @@ locals {
     private_key           = tls_private_key.debian.private_key_openssh,
     data_disk             = var.data_disk != null
   })
+  cloudinit_network_config = templatefile("${path.module}/files/network_config.cfg.tftpl", {
+    fixed_address = var.fixed_address
+  })
 }
 
 resource "tls_private_key" "debian" {
@@ -66,7 +69,7 @@ resource "libvirt_cloudinit_disk" "debian" {
   name           = "${var.name}.iso"
   pool           = var.cloudinit_pool
   user_data      = local.cloudinit_user_data
-  network_config = file("${path.module}/files/network_config.cfg")
+  network_config = local.cloudinit_network_config
 }
 
 resource "libvirt_domain" "debian" {

variables.tf

@@ -56,6 +56,11 @@ variable "ca_host" {
 }
 
 variable "data_disk" {
-  type = string
+  type    = string
+  default = null
+}
+
+variable "fixed_address" {
+  type    = string
   default = null
 }