feat: scaffold netcup vps host (disko/vda, static net, tailscale, caddy)

- new nixosConfigurations.vps: UEFI systemd-boot, disko on /dev/vda - static IPv4 159.195.64.117/22 gw .1 (+ IPv6), eth0 pinned, public DNS - tailscale via headscale + sops authkey (secrets/vps.yaml, own host key) - caddy public reverse proxy: audiobookshelf.mgaction.town -> jupiter tailnet:8000 - shared common.nix (user/ssh/nix) ; .sops.yaml per-host rules
2026-07-13 01:01:53 +02:00
parent 25c6982cea
commit 946c44f1d3
8 changed files with 223 additions and 6 deletions
@@ -0,0 +1,64 @@
+{ config, pkgs, lib, ... }:
+
+# netcup VPS (UEFI, /dev/vda). Public reverse proxy + tailnet node.
+{
+  imports = [
+    ./hardware-configuration.nix
+    ./disk-config.nix          # disko: vda partitions + filesystems
+    ./secrets.nix              # sops-nix: tailscale authkey
+    ../common.nix              # shared user / ssh / nix settings
+  ];
+
+  # ---- Boot (UEFI) ----
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+  # Root is on the virtio disk — pin these so stage-1 mounts it regardless of
+  # what nixos-generate-config detects in the installer.
+  boot.initrd.availableKernelModules = [ "virtio_pci" "virtio_blk" "virtio_scsi" ];
+
+  networking.hostName = "vps";
+
+  # ---- Static networking (netcup) ----
+  # No LAN fallback: get this right or the box is unreachable (use netcup's
+  # VNC console / rescue system to fix). Values captured from the running VPS.
+  networking.useDHCP = false;
+  networking.usePredictableInterfaceNames = false;   # keep the NIC named eth0
+  networking.interfaces.eth0 = {
+    ipv4.addresses = [ { address = "159.195.64.117"; prefixLength = 22; } ];
+    ipv6.addresses = [ { address = "2a0a:4cc0:c2:19e1:44b4:8dff:fe4d:c7d7"; prefixLength = 64; } ];
+  };
+  networking.defaultGateway = { address = "159.195.64.1"; interface = "eth0"; };
+  # netcup IPv6 gateway is conventionally fe80::1 — VERIFY with `ip -6 route`
+  # on the running VPS; wrong v6 gw won't break v4 reachability.
+  networking.defaultGateway6 = { address = "fe80::1"; interface = "eth0"; };
+  # Public resolvers for early boot; tailscale MagicDNS overrides once up.
+  networking.nameservers = [ "9.9.9.9" "1.1.1.1" "2620:fe::fe" ];
+
+  networking.firewall = {
+    enable = true;
+    allowedTCPPorts = [ 22 80 443 ];
+    trustedInterfaces = [ "tailscale0" ];   # reach admin services over the tailnet
+  };
+
+  # ---- Tailscale (via headscale) ----
+  services.tailscale = {
+    enable = true;
+    authKeyFile = config.sops.secrets.tailscale_authkey.path;
+    extraUpFlags = [ "--login-server=https://vpn.mgaction.town" ];
+  };
+
+  # ---- Public reverse proxy ----
+  # Caddy gets automatic public HTTPS (Let's Encrypt) for real domains.
+  # Proxies to jupiter's audiobookshelf over the tailnet (MagicDNS name).
+  # Add one block per public service. Needs a public A record -> this VPS IP
+  # and ports 80/443 open (they are, above).
+  services.caddy = {
+    enable = true;
+    virtualHosts."audiobookshelf.mgaction.town".extraConfig = ''
+      reverse_proxy http://jupiter.hosts.mgaction.town:8000
+    '';
+    # TODO: port your other VPS services' vhosts here before deploying.
+  };
+
+  system.stateVersion = "26.05";   # set at install time; do NOT bump on upgrades
+}
@@ -0,0 +1,37 @@
+{ ... }:
+
+# Declarative disk layout (disko) for the netcup VPS.
+# UEFI: GPT with an ESP + ext4 root on the single virtio disk.
+#
+# ⚠️  /dev/vda is WIPED on install — this destroys everything currently on the
+#     VPS (docker containers, data, existing caddy config). Back up / port your
+#     services into NixOS BEFORE running nixos-anywhere.
+{
+  disko.devices.disk.vps = {
+    type = "disk";
+    device = "/dev/vda";        # netcup virtio disk (256G)
+    content = {
+      type = "gpt";
+      partitions = {
+        ESP = {
+          size = "512M";
+          type = "EF00";
+          content = {
+            type = "filesystem";
+            format = "vfat";
+            mountpoint = "/boot";
+            mountOptions = [ "umask=0077" ];
+          };
+        };
+        root = {
+          size = "100%";
+          content = {
+            type = "filesystem";
+            format = "ext4";
+            mountpoint = "/";
+          };
+        };
+      };
+    };
+  };
+}
@@ -0,0 +1,23 @@
+# PLACEHOLDER — replace on install.
+#
+# disko (disk-config.nix) owns the filesystems, so this file only carries
+# kernel modules + platform. nixos-anywhere regenerates it via:
+#   nixos-generate-config --no-filesystems
+# Keep the imports/kernel-module lines; the virtio modules are pinned in
+# configuration.nix so root mounts even if the generator misses them.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
+
+  boot.initrd.availableKernelModules = [ "ahci" "xhci_pci" "virtio_pci" "virtio_blk" "sr_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  # NO fileSystems here — disko defines "/" and "/boot".
+
+  swapDevices = [ ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+}
@@ -0,0 +1,12 @@
+{ config, ... }:
+
+# sops-nix wiring for the VPS. Encrypted values live in ../secrets/vps.yaml,
+# decrypted with the VPS's own SSH host key (recipient in ../.sops.yaml).
+# The host key is pre-generated on the laptop and shipped at install
+# (nixos-anywhere --extra-files -> /etc/ssh/ssh_host_ed25519_key).
+{
+  sops.defaultSopsFile = ../secrets/vps.yaml;
+  sops.age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
+
+  sops.secrets.tailscale_authkey = { };
+}