From f4738584c367ce6986034011c0bd49d7dfc101cc Mon Sep 17 00:00:00 2001
From: DannyDannyDanny <dth@taiga.ai>
Date: Fri, 24 Apr 2026 14:51:41 +0200
Subject: [PATCH] =?UTF-8?q?fix(vps-relay):=20add=20virtio=20modules=20to?=
 =?UTF-8?q?=20initrd=20so=20it=20boots=20on=20Hetzner=20=F0=9F=9B=B0?=
 =?UTF-8?q?=EF=B8=8F?=
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---
 nixos/hosts/vps-relay.nix | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/nixos/hosts/vps-relay.nix b/nixos/hosts/vps-relay.nix
index 8147561..d589cee 100644
--- a/nixos/hosts/vps-relay.nix
+++ b/nixos/hosts/vps-relay.nix
@@ -13,6 +13,20 @@
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 
+  # Hetzner Cloud cx23 uses QEMU virtio-scsi for the disk and virtio-net
+  # for the NIC. Without these modules in initrd, the kernel can't find
+  # the root partition and hangs during boot.
+  boot.initrd.availableKernelModules = [
+    "virtio_pci"
+    "virtio_scsi"
+    "virtio_net"
+    "virtio_blk"
+    "ata_piix"
+    "sd_mod"
+    "sr_mod"
+  ];
+  boot.kernelModules = [ "virtio_pci" "virtio_scsi" "virtio_net" ];
+
   # Cloud provisioners add the initial root SSH key via cloud-init or
   # equivalent; we don't run cloud-init. All config is baked at install.
   networking.hostName = "vps-relay";