From b67f713c8f2b358f51702e50de0ca45501abf9b7 Mon Sep 17 00:00:00 2001
From: Ewoud Kohl van Wijngaarden <ewoud@kohlvanwijngaarden.nl>
Date: Fri, 31 Oct 2025 01:58:57 +0100
Subject: [PATCH] Set the libvirt management domain

This makes sure the domain is set when the management domain is created,
which makes libvirt configure dnsmasq as a proper DNS server. This can
be used together with systemd-resolved on the host to look up guest IPs.

It also configures Vagrant in CI with DNS set up to utilize this.
---
 .github/workflows/test.yml | 2 ++
 Vagrantfile                | 8 ++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a2d71a46..d0ad71cd 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -55,6 +55,8 @@ jobs:
           python-version: '3.12'
       - name: Setup libvirt for Vagrant
         uses: voxpupuli/setup-vagrant@v0
+        with:
+          configure_dns: true
       - name: Install Ansible
         run: pip install --upgrade ansible-core
       - name: Setup environment
diff --git a/Vagrantfile b/Vagrantfile
index d89ea60f..2f9f71c1 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -1,3 +1,5 @@
+DOMAIN = 'example.com'.freeze
+
 Vagrant.configure("2") do |config|
   config.vm.box = "centos/stream9"
   config.vm.synced_folder ".", "/vagrant"
@@ -8,12 +10,13 @@ Vagrant.configure("2") do |config|
   end
 
   config.vm.define "quadlet" do |override|
-    override.vm.hostname = "quadlet.example.com"
+    override.vm.hostname = "quadlet.#{DOMAIN}"
 
     override.vm.provider "libvirt" do |libvirt, provider|
       libvirt.memory = 10240
       libvirt.cpus = 4
       libvirt.machine_virtual_size = 30
+      libvirt.management_network_domain = DOMAIN
     end
 
     override.vm.provision('disk_resize', type: 'ansible') do |ansible_provisioner|
@@ -22,10 +25,11 @@ Vagrant.configure("2") do |config|
   end
 
   config.vm.define "client" do |override|
-    override.vm.hostname = "client.example.com"
+    override.vm.hostname = "client.#{DOMAIN}"
 
     override.vm.provider "libvirt" do |libvirt, provider|
       libvirt.memory = 1024
+      libvirt.management_network_domain = DOMAIN
     end
   end
 end