Improve Proxmox backup image generation

configuration/common/default.nix

@@ -58,11 +58,12 @@
       [Unit]
       Description=print-public-ssh-host-key.service
       Before=getty@tty1.service
+      After=sshd.service
 
       [Service]
       Type=oneshot
-      ExecStart=/run/current-system/sw/bin/bash -c "/run/current-system/sw/bin/echo ----- ED25519 PUBLIC SSH HOST KEY -----\
-                && /run/current-system/sw/bin/cut -d ' ' -f 1-2 /etc/ssh/ssh_host_ed25519_key.pub"
+      ExecStart=/run/current-system/sw/bin/bash -c "/run/current-system/sw/bin/echo -e \"----- ED25519 PUBLIC SSH HOST KEY -----\
+                \n$(/run/current-system/sw/bin/cut -d ' ' -f 1-2 /etc/ssh/ssh_host_ed25519_key.pub)\""
       RemainAfterExit=no
       StandardOutput=tty
     '';

configuration/nixos-generators/default.nix

@@ -10,5 +10,26 @@
     firewall.enable = true;
   };
 
+  proxmox = {
+    qemuConf = {
+      ostype = "l26";
+      cores = 2;
+      memory = 1024;
+      bios = "seabios";
+      # Option not available in 23.05
+      # diskSize = "8096";
+      virtio0 = "local-zfs:base-disk-0,discard=on";
+      boot = "order=virtio0";
+      net0 = "tag=999,virtio=00:00:00:00:00:00,bridge=vmbr0,firewall=1";
+      agent = true;
+    };
+    qemuExtraConf = {
+      cpu = "cputype=host,flags=+aes";
+      onboot = 1;
+      machine = "q35";
+      template = 1;
+    };
+  };
+
   system.stateVersion = "23.05";
 }

configuration/proxmox-vm/default.nix

@@ -1,5 +1,9 @@
 { ... }:
 {
+  imports = [
+    ./hardware-configuration.nix
+  ];
+
   # Enable console output on TTY1 and serial console
   boot.kernelParams = [
     "console=tty1"

configuration/proxmox-vm/hardware-configuration.nix

@@ -1,11 +1,14 @@
 { config, lib, modulesPath, ... }:
 {
+  # hardware-configuration.nix copied and adapted from the default configuration generated by nixos-generators
+
   imports = [
     (modulesPath + "/profiles/qemu-guest.nix")
   ];
 
   boot = {
     initrd = {
+      # To use the VirtIO SCSI disks, add the "virtio_scsi" kernel module to availableKernelModules
       availableKernelModules = [ "uhci_hcd" "ehci_pci" "ahci" "virtio_pci" "virtio_blk" ];
       kernelModules = [ ];
     };

flake.lock

@@ -38,11 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1690726002,
-        "narHash": "sha256-cACz6jCJZtsZHGCJAN4vMobxzH5s6FCOTZHMrh/Hu0M=",
+        "lastModified": 1691016377,
+        "narHash": "sha256-Vvi49vIL2CzX5bsfE3qovcmzJpkfMo/Mx/coCbu5Jeo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "391e8db1f06c3f74c2d313a73135515023af3993",
+        "rev": "ad73028def6716978adaec5b0b7706edc611a83e",
         "type": "github"
       },
       "original": {
@@ -54,11 +54,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1690738238,
-        "narHash": "sha256-yUFU7PGQzOEDX2Y64QV7xNHkn3RjkOTqvZ5oW5gbgGY=",
+        "lastModified": 1691071044,
+        "narHash": "sha256-bYBWtupK/NO/diSpye8TP1E0IC7wj29y2q6blD0FtPk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "6376df481833e5f2e83eade8d8f2d04beed007d0",
+        "rev": "2a1f1797be6e4125ade0be6ac32bb70106ff7245",
         "type": "github"
       },
       "original": {

hosts.nix

@@ -4,7 +4,6 @@ let
   environments = {
     "proxmox" = [
       ./configuration/proxmox-vm
-      ./configuration/proxmox-vm/hardware-configuration.nix
     ]; 
   };
   generateDefaults = hosts: builtins.mapAttrs (name: {