fix(nfs): mask rpc-svcgssd on server and ha-server build types

nfs-utils changed ConditionPathExists from !/etc/krb5.keytab to
/etc/krb5.keytab, so on IPA-joined hosts the service now starts instead
of skipping. Exports use standard auth (no sec=krb5) so the nfs/ Kerberos
principal is never provisioned and the service fails.

enable = false masks the unit so nfs-server's Wants= can't pull it in.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -23,3 +23,5 @@ host-keys/
 # Temporary Milestone 1 audit checklist (remove-sensetive-info-refactor.md)
 # - working notes only, never committed, deleted once every row is rotated.
 secrets-inventory.md
+.claude/worktrees/                                                                                                  
+.claude/settings.local.json 

CLAUDE.md

@@ -21,9 +21,7 @@ machines when deployed.
   `modules/installer/common.nix` (the auto-installer's own root/nixos login —
   a deliberate, documented choice, see `docs/auto-installer.md`, not
   accidental tech debt) and **SSH public keys** in `variables.nix`
-  (`vars.adminSshKey`, `vars.remoteBuilderAuthorizedKeys`) plus a couple of
-  per-host `KEY` values for beszel-agent auth (`hosts/server/host.nix`,
-  `hosts/nix-cache/host.nix`). Don't use the installer's hardcoded hash as a
+  (`vars.adminSshKey`, `vars.remoteBuilderAuthorizedKeys`, `vars.beszelHubKey`). Don't use the installer's hardcoded hash as a
   template for a *real* host — every other host uses sops-nix
   (`hashedPasswordFile`, see "Security Notes" in `README.md`). Flag any *new*
   secret-like string you encounter instead of committing it.
@@ -375,9 +373,8 @@ removing a host.
 
 - `hosts/<name>/host.nix` — per-machine identity **only**: hostname, hostId,
   per-machine secrets, `system.stateVersion`. These files carry no `imports`
-  of their own beyond narrow parameterized helpers (see
-  `modules/beszel/host-token.nix` below) — all shared behavior comes from the
-  platform/build-type modules composed in `flake.nix`, not from the host file.
+  of their own — all shared behavior comes from the platform/build-type modules
+  composed in `flake.nix`, not from the host file.
 - `modules/platforms/{linode,proxmox,lxc,baremetal}.nix` — platform-specific
   config: boot method, guest tooling, and the hardware config, imported
   directly by the platform module itself — **not** wired in from
@@ -434,10 +431,10 @@ removing a host.
   substituter + SSH remote-builder wiring; see `docs/nix-cache.md` for the
   full design (per-host local stores, no shared `/nix/store`, and how the
   `nixremote` signing/SSH keys fit together).
-- `modules/beszel/host-token.nix` — parameterized helper module
-  (`{ name, sopsFile }`) that wires a host's beszel-agent sops secret/template
-  and `environmentFile`; used by `hosts/server/host.nix` and
-  `hosts/nix-cache/host.nix` to avoid duplicating that boilerplate.
+- `modules/beszel/enable-agent.nix` — enables beszel-agent, sets `HUB_URL`,
+  fixes the upstream `StateDirectory` bug, and wires the universal
+  `beszel-token` sops secret (from `secrets/common.yaml`) into the agent's
+  `environmentFile`; see `docs/beszel.md` for the full setup guide.
 - `modules/tailscale/`, `modules/docker/`, `modules/networking/`,
   `modules/traefik/`, `modules/tor/`, `modules/services/*` — single-purpose,
   single-host

docs/beszel.md

@@ -0,0 +1,113 @@
+# Beszel agent
+
+[Beszel](https://github.com/henrygd/beszel) is the monitoring dashboard used
+in this LAN. The hub runs as a Docker container on `docker.sweet.home` (port
+`vars.ports.beszelHub`, 8090). Each monitored NixOS host runs a
+`beszel-agent` that connects back to the hub.
+
+---
+
+## How it works
+
+Everything is handled by a single module:
+
+**`modules/beszel/enable-agent.nix`** — imported by a build type. It:
+- Enables `beszel-agent`
+- Sets `HUB_URL` to `docker.sweet.home:8090`
+- Sets `KEY` from `vars.beszelHubKey` (`variables.nix`) — the hub's SSH
+  public key, shared by every agent. Update `beszelHubKey` if the docker
+  host is ever rebuilt and the hub generates a new keypair.
+- Reads the universal `beszel-token` from `secrets/common.yaml` via sops
+  and passes it to the agent as `TOKEN` in an env file
+- Fixes an upstream bug where the agent couldn't persist its hub-pairing
+  fingerprint across restarts (adds a real `StateDirectory`)
+
+A host file needs no beszel configuration at all — just import the module
+in the build type and add the system in the hub UI.
+
+---
+
+## Adding beszel to a new build type
+
+Add `../beszel/enable-agent.nix` to the `imports` list in
+`modules/build-types/<type>.nix`:
+
+```nix
+imports = [
+  ../beszel/enable-agent.nix
+  # ... other imports
+];
+```
+
+That's the only change required. The host file needs nothing.
+
+---
+
+## Adding a new system to the hub
+
+1. Rebuild and deploy the host with its build type importing `enable-agent.nix`.
+2. Open the beszel hub (`http://docker.sweet.home:8090`).
+3. Go to **Systems → Add system**, enter the host's IP and the default port
+   (45876). The agent will connect and the system will appear as active.
+
+---
+
+## One-time setup: add the token to `secrets/common.yaml`
+
+The universal token is stored once in the common secrets file, shared by all
+agents. Only needed once, not per-host:
+
+```sh
+sops secrets/common.yaml
+```
+
+Add:
+```yaml
+beszel-token: <token from the beszel hub Settings → Keys>
+```
+
+`secrets/common.yaml` is already a sops recipient for every host via their
+SSH host keys, so no additional sops recipient setup is needed.
+
+---
+
+## Optional: monitoring extra filesystems
+
+To report disk usage for a mount beyond the root filesystem, add
+`EXTRA_FILESYSTEMS` in the host file:
+
+```nix
+services.beszel.agent.environment = {
+  EXTRA_FILESYSTEMS = "/mnt/data";   # colon-separated for multiple paths
+};
+```
+
+The `server` host uses this to expose its ZFS data pool:
+
+```nix
+services.beszel.agent.environment = {
+  EXTRA_FILESYSTEMS = "${vars.storageRoot}/${vars.nfsShares.dockerVolumes.subpath}";
+  LOG_LEVEL = "debug";
+};
+```
+
+---
+
+## Optional: monitoring Docker containers
+
+`enable-agent.nix` has a commented-out line for Docker monitoring:
+
+```nix
+#DOCKER_HOST = "tcp://docker-socket-proxy:2375";
+```
+
+Uncomment it if the host runs docker-socket-proxy and you want per-container
+stats. Hosts without Docker should leave it commented out.
+
+---
+
+## If the hub key changes
+
+If the docker host is ever rebuilt and beszel generates a new SSH keypair,
+update `beszelHubKey` in `variables.nix` and rebuild all beszel-enabled hosts.
+The new key is visible in the beszel hub under **Settings → Keys**.

hosts/ha-server-1/host.nix

@@ -1,12 +1,5 @@
 { vars, ... }:
 {
-  imports = [
-    (import ../../modules/beszel/host-token.nix {
-      name = "ha-server-1";
-      sopsFile = ../../secrets/ha-server-1.yaml;
-    })
-  ];
-
   networking = {
     hostName = vars.haServer1Host;
     hostId = "3a4b5c6d";
@@ -23,8 +16,5 @@
     nameservers = [ vars.domainControllerIp ];
   };
 
-  # Set KEY after pairing this host with the beszel hub; the token is sops-managed.
-  # services.beszel.agent.environment.KEY = "";
-
   system.stateVersion = "26.05";
 }

hosts/ha-server-2/host.nix

@@ -1,12 +1,5 @@
 { vars, ... }:
 {
-  imports = [
-    (import ../../modules/beszel/host-token.nix {
-      name = "ha-server-2";
-      sopsFile = ../../secrets/ha-server-2.yaml;
-    })
-  ];
-
   networking = {
     hostName = vars.haServer2Host;
     hostId = "7e8f9a0b";
@@ -23,8 +16,5 @@
     nameservers = [ vars.domainControllerIp ];
   };
 
-  # Set KEY after pairing this host with the beszel hub; the token is sops-managed.
-  # services.beszel.agent.environment.KEY = "";
-
   system.stateVersion = "26.05";
 }

hosts/nix-cache/host.nix

@@ -1,13 +1,6 @@
 { vars, ... }:
 
 {
-  imports = [
-    (import ../../modules/beszel/host-token.nix {
-      name = "nix-cache";
-      sopsFile = ../../secrets/nix-cache.yaml;
-    })
-  ];
-
   networking = {
     hostName = vars.nixCacheHost;
     useDHCP = false;
@@ -19,10 +12,6 @@
     nameservers = [ vars.domainControllerIp ];
   };
 
-  services.beszel.agent.environment = {
-    KEY = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFPR9kwtC4TAeTRu46A7+opZsYpxqkRJ+x/ZyB2GWCeG";
-  };
-
   # Preserved from the pre-refactor `nix-cache` target — stateVersion must
   # never be bumped on an already-installed machine.
   system.stateVersion = "25.05";

hosts/nixos/home.nix

@@ -26,7 +26,7 @@
 
     # Optional: set environment vars
     sessionVariables = {
-      EDITOR = "vim";
+      EDITOR = "nano";
       SOPS_AGE_KEY_FILE = "${config.home.homeDirectory}/.config/sops/age/keys.txt";
     };
 

hosts/server/host.nix

@@ -1,13 +1,6 @@
 { vars, ... }:
 
 {
-  imports = [
-    (import ../../modules/beszel/host-token.nix {
-      name = "server";
-      sopsFile = ../../secrets/server.yaml;
-    })
-  ];
-
   networking = {
     hostName = vars.nfsServerHost;
     hostId = "6689f93e";
@@ -21,7 +14,6 @@
   };
 
   services.beszel.agent.environment = {
-    KEY = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFPR9kwtC4TAeTRu46A7+opZsYpxqkRJ+x/ZyB2GWCeG";
     EXTRA_FILESYSTEMS = "${vars.storageRoot}/${vars.nfsShares.dockerVolumes.subpath}";
     LOG_LEVEL = "debug";
   };

hosts/tailscale-router/host.nix

@@ -1,13 +1,6 @@
 { vars, ... }:
 
 {
-  imports = [
-    (import ../../modules/beszel/host-token.nix {
-      name = "tailscale-router";
-      sopsFile = ../../secrets/tailscale-router.yaml;
-    })
-  ];
-
   networking = {
     hostName = "tailscale-router";
     useDHCP = false;
@@ -19,10 +12,6 @@
     nameservers = [ vars.domainControllerIp ];
   };
 
-  services.beszel.agent.environment = {
-    KEY = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFPR9kwtC4TAeTRu46A7+opZsYpxqkRJ+x/ZyB2GWCeG";
-  };
-
   # No networking.hostId: only ZFS-touching hosts (server, docker) need one
   # for pool-import safety, and this host does neither.
 

hosts/tor-relay/host.nix

@@ -1,13 +1,6 @@
 { vars, ... }:
 
 {
-  imports = [
-    (import ../../modules/beszel/host-token.nix {
-      name = "tor-relay";
-      sopsFile = ../../secrets/tor-relay.yaml;
-    })
-  ];
-
   networking = {
     hostName = "tor-relay";
     useDHCP = false;
@@ -22,10 +15,6 @@
   # No networking.hostId: only ZFS-touching hosts need one for pool-import
   # safety, and this host does neither.
 
-  services.beszel.agent.environment = {
-    KEY = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFPR9kwtC4TAeTRu46A7+opZsYpxqkRJ+x/ZyB2GWCeG";
-  };
-
   # A genuinely new host (not a pre-refactor carry-over), so it tracks the
   # flake's current nixpkgs release rather than being pinned to an older one.
   system.stateVersion = "26.05";

modules/beszel/enable-agent.nix

@@ -1,10 +1,23 @@
-{ vars, ... }:
+{ config, vars, ... }:
 
 {
-  services.beszel.agent.enable = true;
-  services.beszel.agent.environment = {
+  # Universal token shared by all beszel agents. Add to secrets/common.yaml:
+  #   sops secrets/common.yaml
+  #   beszel-token: <value from the beszel hub UI>
+  sops.secrets."beszel-token" = { };
+
+  sops.templates."beszel.env".content = ''
+    TOKEN=${config.sops.placeholder."beszel-token"}
+  '';
+
+  services.beszel.agent = {
+    enable = true;
+    environmentFile = config.sops.templates."beszel.env".path;
+    environment = {
       #DOCKER_HOST = "tcp://docker-socket-proxy:2375";
       HUB_URL = "http://${vars.dockerHost}.${vars.homeDomain}:${toString vars.ports.beszelHub}";
+      KEY = vars.beszelHubKey;
+    };
   };
 
   # The upstream module runs beszel-agent under DynamicUser with

modules/beszel/host-token.nix

@@ -1,11 +0,0 @@
-{ name, sopsFile }:
-
-{ config, ... }:
-
-{
-  sops.secrets."beszel-token".sopsFile = sopsFile;
-  sops.templates."${name}-beszel.env".content = ''
-    TOKEN=${config.sops.placeholder."beszel-token"}
-  '';
-  services.beszel.agent.environmentFile = config.sops.templates."${name}-beszel.env".path;
-}

modules/build-types/ha-server.nix

@@ -45,4 +45,7 @@ in
   # Pacemaker controls nfs-server — prevent systemd from starting it at boot
   # on both nodes (only the Active node should be serving NFS).
   systemd.services.nfs-server.wantedBy = lib.mkForce [ ];
+
+  # Same reason as server.nix: exports use standard auth, not Kerberos.
+  systemd.services.rpc-svcgssd.enable = false;
 }

modules/build-types/server.nix

@@ -102,6 +102,12 @@ in
     requires = [ "zfs-mount.service" ];
   };
 
+  # rpc-svcgssd handles Kerberos/GSS-API for NFS. Not needed: exports use
+  # standard auth, not sec=krb5. On IPA-joined hosts the keytab exists (host/
+  # principal only) but has no nfs/ principal, causing spurious failure.
+  # Mask it so nfs-server's Wants= can't pull it in.
+  systemd.services.rpc-svcgssd.enable = false;
+
   services.nfs.server = {
     enable = true;
     exports = mkNfsExports vars.storageRoot;

scripts/ha/resize-data-disk.sh

@@ -0,0 +1,276 @@
+#!/usr/bin/env bash
+# resize-data-disk.sh — online resize of the HA cluster data disk
+#
+# Three-phase process (all online-safe, no downtime required):
+#   1. Proxmox: grow scsi1 on both HA VMs   (qm resize)
+#   2. Guest:   rescan block device on both nodes so the kernel sees the new size
+#   3. DRBD + XFS: drbdadm resize, then xfs_growfs — active node only
+#
+# Usage:
+#   scripts/ha/resize-data-disk.sh --size +20G [--force] [--dry-run]
+#
+#   --size +NNg    amount to grow scsi1 by, e.g. +20G, +50G (required)
+#                  XFS and DRBD cannot shrink; only positive deltas accepted
+#   --force        skip the interactive confirmation prompt
+#   --dry-run      show what would be done without changing anything
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+# shellcheck source=../env.sh
+source "${SCRIPT_DIR}/../env.sh"
+
+# ── Configuration ─────────────────────────────────────────────────────────
+NODE1="${NODE1:-ha-server-1}"
+NODE2="${NODE2:-ha-server-2}"
+NODE1_IP="${NODE1_IP:-192.168.2.228}"
+NODE2_IP="${NODE2_IP:-192.168.2.227}"
+XFS_MOUNT="${XFS_MOUNT:-/srv/ha-data}"
+DRBD_RESOURCE="${DRBD_RESOURCE:-ha-data}"
+DATA_DISK_SLOT="${DATA_DISK_SLOT:-scsi1}"   # Proxmox disk name (scsi1 = data disk)
+HA_USER="${HA_USER:-nixos}"
+PVE_HOST="${PVE_HOST:-${PVE1_HOST}}"
+PVE_SSH_USER="${PVE_SSH_USER:-${PROXMOX_SSH_USER}}"
+# By-id symlink for the data disk; basename resolves to the raw block device.
+# matches variables.nix's haServerDrbdDisk.
+DATA_DISK_BYID="${DATA_DISK_BYID:-scsi-0QEMU_QEMU_HARDDISK_drive-${DATA_DISK_SLOT}}"
+# ──────────────────────────────────────────────────────────────────────────
+
+pve() { ssh -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no -o ConnectTimeout=10 \
+          "${PVE_SSH_USER}@${PVE_HOST}" "$@"; }
+n1()  { ssh -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no -o ConnectTimeout=5 \
+          "${HA_USER}@${NODE1_IP}" sudo "$@" 2>/dev/null; }
+n2()  { ssh -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no -o ConnectTimeout=5 \
+          "${HA_USER}@${NODE2_IP}" sudo "$@" 2>/dev/null; }
+
+# ── Argument parsing ───────────────────────────────────────────────────────
+SIZE=""
+FORCE=false
+DRY_RUN=false
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --size)    shift; SIZE="${1:?--size requires a value (e.g. +20G)}" ;;
+    --force)   FORCE=true ;;
+    --dry-run) DRY_RUN=true ;;
+    *) echo "Unknown argument: $1"
+       echo "Usage: $0 --size +NNg [--force] [--dry-run]"
+       exit 1 ;;
+  esac
+  shift
+done
+
+if [[ -z "$SIZE" ]]; then
+  echo "ERROR: --size is required (e.g. --size +20G)"
+  echo "Usage: $0 --size +NNg [--force] [--dry-run]"
+  exit 1
+fi
+
+# Only positive deltas — qm resize, DRBD, and XFS all refuse to shrink.
+if [[ ! "$SIZE" =~ ^\+[0-9]+(G|M|T)$ ]]; then
+  echo "ERROR: --size must be a positive delta like +20G, +50G, +500M, +2T"
+  echo "       (qm resize, drbdadm resize, and xfs_growfs can only grow, not shrink)"
+  exit 1
+fi
+
+DRY_PREFIX=""
+$DRY_RUN && DRY_PREFIX="[dry-run] "
+
+echo "════════════════════════════════════════════════════"
+echo " HA Data Disk Resize — $(date '+%Y-%m-%d %H:%M:%S')"
+echo " Size delta: $SIZE  •  Proxmox: $PVE_HOST"
+$DRY_RUN && echo " MODE: dry-run — no changes will be made"
+echo "════════════════════════════════════════════════════"
+
+# ── Detect active node ─────────────────────────────────────────────────────
+echo ""
+echo "Detecting active node..."
+
+CRM_OUT=""
+if ssh -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no -o ConnectTimeout=5 \
+     "${HA_USER}@${NODE1_IP}" true 2>/dev/null; then
+  CRM_OUT=$(n1 "crm_mon -1" 2>/dev/null || true)
+fi
+if [[ -z "$CRM_OUT" ]]; then
+  if ssh -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no -o ConnectTimeout=5 \
+       "${HA_USER}@${NODE2_IP}" true 2>/dev/null; then
+    CRM_OUT=$(n2 "crm_mon -1" 2>/dev/null || true)
+  fi
+fi
+
+# crm_mon 2.x formats Promoted lines as "    * Promoted: [ node ]" (bullet *),
+# so ^\s*(Promoted|Masters): never matches; filter Unpromoted first instead.
+ACTIVE_NODE=$(echo "$CRM_OUT" | grep -v 'Unpromoted\|Unmanaged' | \
+  grep -E '(Promoted|Masters):' | \
+  grep -oE '\b(ha-server-[0-9]+)\b' | head -1 || true)
+
+if [[ -z "$ACTIVE_NODE" ]]; then
+  echo "ERROR: could not determine active node from crm_mon."
+  echo "  Is Pacemaker still settling?  Try running scripts/ha/health.sh first."
+  exit 1
+fi
+
+if [[ "$ACTIVE_NODE" == "$NODE1" ]]; then
+  ACTIVE_IP="$NODE1_IP"
+  na() { n1 "$@"; }
+else
+  ACTIVE_IP="$NODE2_IP"
+  na() { n2 "$@"; }
+fi
+
+echo "  Active node: $ACTIVE_NODE ($ACTIVE_IP)"
+
+# ── Pre-check DRBD state ───────────────────────────────────────────────────
+echo ""
+echo "Pre-checks..."
+
+DRBD_DSTATE=$(na "drbdadm dstate ${DRBD_RESOURCE} 2>/dev/null" 2>/dev/null || echo "unknown")
+if ! echo "$DRBD_DSTATE" | grep -q "UpToDate/UpToDate"; then
+  echo "  WARNING: DRBD dstate is '$DRBD_DSTATE' (expected UpToDate/UpToDate)."
+  echo "  Resizing with a partially-synced disk may cause issues."
+  if ! $FORCE; then
+    echo "  Use --force to proceed anyway."
+    exit 1
+  fi
+  echo "  --force specified — proceeding despite non-ideal DRBD state."
+else
+  echo "  DRBD dstate: $DRBD_DSTATE — OK"
+fi
+
+# ── Find VMIDs on Proxmox ─────────────────────────────────────────────────
+echo ""
+echo "Looking up VM IDs on ${PVE_HOST}..."
+
+QM_LIST=$(pve "qm list 2>/dev/null" || true)
+VMID1=$(echo "$QM_LIST" | awk -v name="$NODE1" '$0 ~ name {print $1}' | head -1)
+VMID2=$(echo "$QM_LIST" | awk -v name="$NODE2" '$0 ~ name {print $1}' | head -1)
+
+if [[ -z "$VMID1" ]]; then
+  echo "  ERROR: could not find VMID for $NODE1 on $PVE_HOST"
+  echo "  qm list output:"
+  echo "$QM_LIST" | sed 's/^/    /'
+  exit 1
+fi
+if [[ -z "$VMID2" ]]; then
+  echo "  ERROR: could not find VMID for $NODE2 on $PVE_HOST"
+  echo "  qm list output:"
+  echo "$QM_LIST" | sed 's/^/    /'
+  exit 1
+fi
+
+echo "  $NODE1: VMID $VMID1"
+echo "  $NODE2: VMID $VMID2"
+
+# ── Confirm ────────────────────────────────────────────────────────────────
+if ! $FORCE && ! $DRY_RUN; then
+  echo ""
+  echo "  Plan:"
+  echo "    Phase 1 — qm resize $VMID1 ${DATA_DISK_SLOT} ${SIZE}  (on $PVE_HOST)"
+  echo "              qm resize $VMID2 ${DATA_DISK_SLOT} ${SIZE}  (on $PVE_HOST)"
+  echo "    Phase 2 — block device rescan on $NODE1 and $NODE2"
+  echo "    Phase 3 — drbdadm resize + xfs_growfs on $ACTIVE_NODE"
+  echo "  No downtime required (all operations are online-safe)."
+  printf "  Proceed? [y/N] "
+  read -r ANSWER
+  [[ "${ANSWER,,}" == "y" || "${ANSWER,,}" == "yes" ]] || { echo "Aborted."; exit 0; }
+fi
+
+# ═══════════════════════════════════════════════════════════════
+# Phase 1 — Resize both VM data disks in Proxmox
+# ═══════════════════════════════════════════════════════════════
+echo ""
+echo "── Phase 1 — Proxmox disk resize (${DATA_DISK_SLOT} ${SIZE} on both VMs) ──"
+
+echo "  ${DRY_PREFIX}qm resize $VMID1 ${DATA_DISK_SLOT} ${SIZE}  ($NODE1 on ${PVE_HOST})"
+if ! $DRY_RUN; then
+  pve "qm resize $VMID1 ${DATA_DISK_SLOT} ${SIZE}"
+fi
+
+echo "  ${DRY_PREFIX}qm resize $VMID2 ${DATA_DISK_SLOT} ${SIZE}  ($NODE2 on ${PVE_HOST})"
+if ! $DRY_RUN; then
+  pve "qm resize $VMID2 ${DATA_DISK_SLOT} ${SIZE}"
+fi
+
+echo "  Phase 1 done."
+
+# ═══════════════════════════════════════════════════════════════
+# Phase 2 — Rescan block device on both guest nodes
+# ═══════════════════════════════════════════════════════════════
+echo ""
+echo "── Phase 2 — Block device rescan (both nodes) ──"
+
+rescan_node() {
+  local node_name=$1 run_fn=$2
+
+  # Resolve block device name from the stable by-id symlink on the guest.
+  local blk_dev=""
+  if ! $DRY_RUN; then
+    blk_dev=$($run_fn "bash -c 'basename \$(readlink -f /dev/disk/by-id/${DATA_DISK_BYID})'" 2>/dev/null || true)
+  fi
+  if [[ -z "$blk_dev" ]]; then
+    # Fall back: scsi1 → index 1 → sdb, scsi2 → sdc, etc.
+    local slot_idx
+    slot_idx=$(echo "$DATA_DISK_SLOT" | grep -oE '[0-9]+$' || echo "1")
+    blk_dev=$(printf "sd%s" "$(echo "abcdefghij" | cut -c$((slot_idx + 1)))")
+    echo "  WARNING: could not resolve /dev/disk/by-id/${DATA_DISK_BYID} on $node_name;" \
+         "falling back to /dev/${blk_dev}" >&2
+  fi
+
+  echo "  ${DRY_PREFIX}Rescanning /dev/${blk_dev} on ${node_name}..."
+  if ! $DRY_RUN; then
+    $run_fn "bash -c 'echo 1 > /sys/block/${blk_dev}/device/rescan'" 2>/dev/null
+    local new_size
+    new_size=$($run_fn "lsblk -nd -o SIZE /dev/${blk_dev} 2>/dev/null" 2>/dev/null || echo "unknown")
+    echo "    /dev/${blk_dev} on $node_name now reports: $new_size"
+  fi
+}
+
+rescan_node "$NODE1" n1
+rescan_node "$NODE2" n2
+
+echo "  Phase 2 done."
+
+# ═══════════════════════════════════════════════════════════════
+# Phase 3 — Grow DRBD metadata, then XFS (active node only)
+# ═══════════════════════════════════════════════════════════════
+echo ""
+echo "── Phase 3 — DRBD resize + XFS grow (on active node: $ACTIVE_NODE) ──"
+
+echo "  ${DRY_PREFIX}drbdadm resize ${DRBD_RESOURCE}"
+if ! $DRY_RUN; then
+  na "drbdadm resize ${DRBD_RESOURCE}"
+fi
+
+echo "  ${DRY_PREFIX}xfs_growfs ${XFS_MOUNT}"
+if ! $DRY_RUN; then
+  na "xfs_growfs ${XFS_MOUNT}"
+fi
+
+echo "  Phase 3 done."
+
+# ── Verify ────────────────────────────────────────────────────────────────
+echo ""
+echo "── Verify ──"
+
+if ! $DRY_RUN; then
+  DF_OUT=$(na "df -h '${XFS_MOUNT}' 2>/dev/null" 2>/dev/null || echo "")
+  if [[ -n "$DF_OUT" ]]; then
+    echo "  ${XFS_MOUNT}:"
+    echo "$DF_OUT" | sed 's/^/    /'
+  fi
+
+  DRBD_DSTATE_AFTER=$(na "drbdadm dstate ${DRBD_RESOURCE} 2>/dev/null" 2>/dev/null || echo "unknown")
+  echo "  DRBD dstate: $DRBD_DSTATE_AFTER"
+  if ! echo "$DRBD_DSTATE_AFTER" | grep -q "UpToDate/UpToDate"; then
+    echo "  NOTE: DRBD is resyncing — normal immediately after resize."
+    echo "        Monitor: ssh nixos@${ACTIVE_IP} 'sudo watch -n3 cat /proc/drbd'"
+  fi
+else
+  echo "  [dry-run] would verify df -h ${XFS_MOUNT} and drbdadm dstate on $ACTIVE_NODE"
+fi
+
+echo ""
+echo "════════════════════════════════════════════════════"
+echo " Resize complete."
+echo " Active node: $ACTIVE_NODE"
+echo "════════════════════════════════════════════════════"
+echo ""

variables.nix

@@ -40,17 +40,24 @@
   # from scratch.
   nixCacheHostKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICuHUxGNH6ei3BZD+EfZs3l4X8uJNcjQiOsM/G4yo4O/ lxc-nix-cache";
 
+  # Beszel hub's SSH public key — used by every agent to authenticate the
+  # hub's incoming connection. Update if the docker host is ever rebuilt and
+  # the hub generates a new keypair.
+  beszelHubKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFPR9kwtC4TAeTRu46A7+opZsYpxqkRJ+x/ZyB2GWCeG";
+
   # Public keys authorized to SSH in as remoteBuilderUser on the nix-cache
   # host (modules/nix-cache/server.nix) — one per client host that's allowed
   # to use it as a distributed builder.
   remoteBuilderAuthorizedKeys = [
-    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFDEA1S2ikpObREgbP5uVBWMxIOGbY8B+Wx7VTZK1m6t root@server"
-    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPAYIT9ormlmxZ0SziyDQaUntnKI8HK9/s3Qac1ZKjP2 root@docker"
-    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKKKzoEPl/ZW9KBRHBcp6/ThOngGpwMv5EhkTlgC4aDf root@nixos"
-    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIGtOWOCS+ImHc7NehguoyD7PbonGosKMZqc9+QR3v/h root@nixos"
-    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHxXTQxFnArK5HXG7czeoybZebCGfxpUdusJkPn+BCSp root@server"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIK+ioWPhHixlgCB9KIQ0QTHTz6A+Oo2F3uKiINLip5rO root@docker"
     "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICMJhrfFayLBG+gWtO6oAvgambw5nWWgztiTFEaaaVRH debian@surface"
     "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJEj26SL/emsVjW2YhRucJVp2kTz8WgcEQgjBEBLRikk root@claude"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAII/rLceRhnDobVXQYiPceuhDHHvVjFQ1pc9A6un/eUlA root@server"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHj11bLPpRzH2oslnwFzEvY9cSgfEFtSZbLQaDm4nZMK root@pxe-boot"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIH4/Sesm8NYpj73R0cbGhI0Ubvz73vIVWAnbEDTlBTdh root@tor-relay"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIBCFUUtePndW7pqtlawft1QCdHmBVs3O/c8EJO+RcXV root@tailscale-router"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBZ9WKKAlP9Z7GQdgaZ1Xgw9C+vja2lqEZO5rJFpVqYN root@ha-server-1"
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEGNKlaaMckd8nLWNGz4B2QokXjnnIvM+rEUv+R6h0sp root@ha-server-2"
   ];
 
   # Admin SSH public key, authorized on the primary user of every host and