Enable QEMU guest agent on Proxmox VMs; register lxc-gui sops key

create-proxmox-resource.sh's `qm create` never passed --agent, so despite
services.qemuGuest.enable = true being set on every host, Proxmox never
created the virtio-serial channel the guest agent needs -- qm guest exec
and the UI's IP-address display silently never worked for any VM this
script created. Found while live-testing every lxc-*/proxmox-* build type
against pve.sweet.home for an end-to-end flake audit.

Also registers a fresh sops age key for lxc-gui (no prior registration
existed), generated while testing that target live -- needed before
lxc-gui can be deployed with working secrets.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CZHwwAM7cacQKkqKfQ5e8a

.sops.yaml

@@ -3,11 +3,13 @@ keys:
   - &docker age19gfn2yedg76dmztm4hncr7vf3r3c9j0qpt4rap7y7gersjk4m3ks2lhd0e
   - &server age1ll6hj5ggruetgjwjfnplpn5xtq35uhlcdflksx3xmnjm6s3uad9sz70jkf
   - &nix-cache age120le4a5l8dh3lyfgvmj3d9ksmej6ajs5mer5y7r0vfg3x9fn69dqf8xgzu
-  - &lxc-minimal age1qz9d4ka4xgexujyd247s7lp737sulp5fhxl5d65fj2ykvc4j4edqrsdks8
   - &nix-minimal age120whqj96g26lsgy4udvgsn8dc9lumh8jeu3a564fx79rjr5lxffqmrljuu
   - &proxmox-minimal age10at8862478urh0eeuwh8hzln6ck78jgwtztgxatwqlzwagg77y5snm4xzg
   - &lxc-nix-cache age1xjst4frdh0th6q8m7p7u9g5af7ty5jqeum0p6z8a52a9q7st7ewqw8yl9j
   - &lxc-docker age1ezk9x53zt8kcnscdm80jcyf0xq97vndv7jsn3rl8cc0cwm2jmpmq372dzs
+  - &lxc-minimal age1jy444f9d9stygj4p3w9kh54cqcfr654tvr75tdvee5cxsgtdtc9q3v60ep
+  - &lxc-pxe-boot age1fxxzpnfse8nd9wz78ht3m0plrmraacf4cpga0pe8fm2tdnqcgy8q7qsyvp
+  - &lxc-gui age190htw7prp4vln076dxjx3gxxaq06h0zl0te7cqgpx79vl3lhkaes8suy05
 
 creation_rules:
   # Shared across every currently-deployed host: root/nixos password hash,
@@ -26,6 +28,8 @@ creation_rules:
           - *lxc-nix-cache
           - *proxmox-minimal
           - *lxc-docker
+          - *lxc-pxe-boot
+          - *lxc-gui
 
   - path_regex: secrets/nix-cache\.yaml$
     key_groups:

CLAUDE.md

@@ -137,6 +137,22 @@ lift the shared part into `scripts/lib/` instead of copying it.
   Purely a local filesystem copy — never touches `.sops.yaml`/
   `secrets/*.yaml` or the repo at all. The resulting file is exactly what
   `rotate-admin-key.sh` expects as its backup-key argument.
+- `scripts/secrets/sync-nix-cache-host-key.sh [--check] [--dry-run]
+  [--host <name>]` — detects drift between the ed25519 SSH host key
+  nix-cache is actually serving right now (via `ssh-keyscan`) and
+  `vars.nixCacheHostKey` (`variables.nix`), the value
+  `modules/nix-cache/remote-builder-client.nix` bakes into every real
+  client's declarative `programs.ssh.knownHosts` and
+  `configure-nix-cache-client.sh` hardcodes as its own default for
+  non-NixOS clients. That value has no automatic source of truth — it's
+  set once from whatever nix-cache's host key happened to be at the time,
+  and silently goes stale if the host is ever rebuilt/recreated with a new
+  key, breaking every client's distributed-build SSH trust with no error
+  that points back here. `--check` (used by `codex-maintenance.sh`, which
+  treats an unreachable nix-cache — e.g. from a non-LAN CI runner — as a
+  silent skip rather than a failure) only reports drift; the no-flags form
+  updates both files in place. Declarative clients still need a rebuild to
+  pick up the fix.
 
 ### `scripts/proxmox/`
 

docs/nix-cache.md

@@ -46,18 +46,26 @@ the new key up automatically on next activation — no more manual
 
 ## Remote builder SSH keys
 
-On each client, install the private key used to authenticate as `nixremote`:
+Each client authenticates as `nixremote` using its **own default root SSH
+identity** (`/root/.ssh/id_ed25519`) — not a separately-named or shared
+keypair. If a client doesn't have one yet:
 
 ```bash
-sudo install -d -m 0700 /root/.ssh
-sudo install -m 0600 ./nixremote /root/.ssh/nixremote
-sudo ssh -i /root/.ssh/nixremote nixremote@nix-cache nix-store --version
+sudo ssh-keygen -t ed25519 -N '' -f /root/.ssh/id_ed25519
 ```
 
-On `nix-cache`, install the matching public key used by `nixremote` authorized keys.
+Then add its `.pub` contents as a new entry in `vars.remoteBuilderAuthorizedKeys`
+(`variables.nix`) and rebuild `nix-cache` to pick it up (that list is
+declarative — an imperative `ssh-copy-id nixremote@nix-cache` won't stick;
+it gets overwritten on every rebuild). Verify with:
 
-The committed `nixremote` authorized keys are public SSH keys only. Keep the
-matching private keys on client hosts and out of the repository.
+```bash
+sudo ssh -i /root/.ssh/id_ed25519 nixremote@nix-cache nix-store --version
+```
+
+The committed `remoteBuilderAuthorizedKeys` entries are public SSH keys
+only. Keep the matching private keys on client hosts and out of the
+repository.
 
 nix-cache's own SSH *host* key is trusted declaratively via
 `programs.ssh.knownHosts` in `modules/nix-cache/remote-builder-client.nix`,
@@ -76,8 +84,8 @@ After deployment:
 curl http://nix-cache/nix-cache-info
 nix store ping --store http://nix-cache
 nix show-config | grep -E 'substituters|trusted-public-keys|builders-use-substitutes'
-sudo ssh -i /root/.ssh/nixremote nixremote@nix-cache nix-store --version
-nix build nixpkgs#hello --builders 'ssh://nixremote@nix-cache x86_64-linux /root/.ssh/nixremote 4 2 big-parallel,kvm,nixos-test,benchmark' -L
+sudo ssh -i /root/.ssh/id_ed25519 nixremote@nix-cache nix-store --version
+nix build nixpkgs#hello --builders 'ssh://nixremote@nix-cache x86_64-linux /root/.ssh/id_ed25519 4 2 big-parallel,kvm,nixos-test,benchmark' -L
 nix path-info -r nixpkgs#hello
 curl -I "http://nix-cache/$(basename "$(nix path-info nixpkgs#hello)").narinfo"
 ```

modules/common/configuration.nix

@@ -13,6 +13,24 @@
 
   networking.networkmanager.enable = true; # Easiest to use and most distros use this by default.
 
+  # No host declares a DNS search domain anywhere else, and cross-host
+  # references throughout this repo (vars.nfsServerHost, vars.nixCacheHost,
+  # vars.dockerHost, ...) are bare short names, not FQDNs -- resolving them
+  # depends entirely on whatever network stack happens to be in play
+  # picking up the DHCP-advertised domain as a search suffix. NetworkManager
+  # does that by default, which is why this went unnoticed on
+  # NetworkManager-managed hosts, but LXC containers (modules/platforms/lxc.nix
+  # force-disables NetworkManager and Proxmox writes their systemd-networkd
+  # config itself) never get one. Confirmed live on lxc-docker: systemd-resolved
+  # had no search domain for eth0, "server" failed to resolve
+  # ("Name or service not known") while "server.sweet.home" resolved fine via
+  # the same DNS server, so every NFS mount in modules/docker/mount-data.nix
+  # failed even after fixing the automount/mount=nfs bugs. This applies the
+  # search domain globally via systemd-resolved's own config rather than the
+  # per-link DHCP path, so it isn't at the mercy of whichever component owns
+  # a given host's interface file.
+  networking.search = [ vars.homeDomain ];
+
   # Recommended over the true default (bypasses ZFS's own import safeguards)
   # per the option's own docs; matches hosts/docker/host.nix and
   # modules/services/zfs/enable-service.nix, which already set this

modules/nix-cache/remote-builder-client.nix

@@ -1,10 +1,14 @@
 { pkgs, vars, ... }:
 
 {
-  # Install the remote builder key on each client host (do not commit private keys):
-  #   sudo install -d -m 0700 /root/.ssh
-  #   sudo install -m 0600 ./nixremote /root/.ssh/nixremote
-  #   sudo ssh -i /root/.ssh/nixremote nixremote@nix-cache nix-store --version
+  # Authenticate as nixremote using the client host's own default root SSH
+  # identity (/root/.ssh/id_ed25519) rather than a separately-named key --
+  # matches vars.remoteBuilderAuthorizedKeys, which already authorizes
+  # each host's own default key (one entry per host, not a shared
+  # dedicated keypair). If this host doesn't have one yet:
+  #   sudo -u root ssh-keygen -t ed25519 -N '' -f /root/.ssh/id_ed25519
+  #   # then add its .pub to vars.remoteBuilderAuthorizedKeys and rebuild nix-cache
+  #   sudo ssh -i /root/.ssh/id_ed25519 nixremote@nix-cache nix-store --version
   # Trust nix-cache's SSH host key declaratively so the nix-daemon (root)
   # can connect the first time without a manual ssh-keyscan/known_hosts
   # step on every new client.
@@ -20,7 +24,7 @@
       {
         hostName = vars.nixCacheHost;
         sshUser = vars.remoteBuilderUser;
-        sshKey = "/root/.ssh/${vars.remoteBuilderUser}";
+        sshKey = "/root/.ssh/id_ed25519";
         inherit (pkgs.stdenv.hostPlatform) system;
         maxJobs = 4;
         speedFactor = 2;

scripts/codex-maintenance.sh

@@ -228,6 +228,20 @@ fi
 
 mapfile -t hosts < <(for h in "${!affected_hosts[@]}"; do echo "$h"; done | sort)
 
+echo
+echo "Checking nix-cache host key for drift..."
+if bash "${script_dir}/secrets/sync-nix-cache-host-key.sh" --check; then
+  :
+else
+  drift_status=$?
+  if [[ "$drift_status" -eq 2 ]]; then
+    echo "nix-cache unreachable from here -- skipping host-key drift check."
+  else
+    echo "WARNING: nix-cache's host key has drifted from variables.nix (see above)." >&2
+    echo "  Run 'bash scripts/secrets/sync-nix-cache-host-key.sh' to fix." >&2
+  fi
+fi
+
 echo
 if [[ ${#hosts[@]} -eq 0 ]]; then
   echo "No hosts affected by changed files; skipping host eval."

scripts/proxmox/configure-nix-cache-client.sh

@@ -15,6 +15,16 @@
 # this repo -- update both if nix-cache is ever rebuilt with a new host
 # key or the cache signing key is rotated (see docs/nix-cache.md).
 #
+# REMOTE_BUILDER_KEY defaults to this machine's own default root SSH
+# identity (matches modules/nix-cache/remote-builder-client.nix's
+# convention for real NixOS clients: authenticate as nixremote with the
+# host's own default key, added individually to
+# vars.remoteBuilderAuthorizedKeys, rather than a separately-named or
+# shared keypair) -- generate one with
+# `ssh-keygen -t ed25519 -N '' -f /root/.ssh/id_ed25519` if this machine
+# doesn't have one yet, then add its .pub to vars.remoteBuilderAuthorizedKeys
+# and rebuild nix-cache.
+#
 # Usage:
 #   sudo ./configure-nix-cache-client.sh [--dry-run] [--no-remote-builder] [--no-restart]
 #
@@ -24,9 +34,9 @@
 set -euo pipefail
 
 : "${NIX_CACHE_HOST:=nix-cache}"
-: "${NIX_CACHE_HOST_KEY:=ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHrMKZlIGUd3pH9G3AqbsruqUGjxIXMAZw52u9MwiBCn lxc-nix-cache}"
+: "${NIX_CACHE_HOST_KEY:=ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPeWgMsdaiz4axT/deFc1+0B5bN+GX/NOeW9bbQ0c/IT lxc-nix-cache}"
 : "${REMOTE_BUILDER_USER:=nixremote}"
-: "${REMOTE_BUILDER_KEY:=/root/.ssh/nixremote}"
+: "${REMOTE_BUILDER_KEY:=/root/.ssh/id_ed25519}"
 
 CACHE_PUB_KEY="cache.local-1:usoWYanY3Kpq2+kDIS2nhWoLZiRxanmdysdzqCFBHW4="
 FALLBACK_URL="https://cache.nixos.org/"

scripts/proxmox/create-proxmox-resource.sh

@@ -797,9 +797,15 @@ else
   echo "==> Creating VM ${vmid} (${name})..."
   # pre-enrolled-keys=0 disables OVMF's Secure Boot key pre-enrollment --
   # required, or systemd-boot (unsigned) can't be trusted by the firmware.
+  # --agent 1: wires up the virtio-serial channel QEMU exposes to the guest.
+  # modules/common/configuration.nix sets services.qemuGuest.enable = true
+  # on every host, so the guest-side qemu-ga daemon is already running --
+  # without this flag Proxmox never creates the channel it listens on, so
+  # `qm guest exec`/`qm agent` and the UI's IP-address display silently
+  # never work for any VM this script creates.
   remote "qm create ${vmid} --name ${name} --memory ${memory} --cores ${cores} \
 --net0 virtio,bridge=${bridge} --bios ovmf --machine q35 --scsihw virtio-scsi-pci \
---efidisk0 ${storage}:1,efitype=4m,pre-enrolled-keys=0"
+--efidisk0 ${storage}:1,efitype=4m,pre-enrolled-keys=0 --agent enabled=1"
 
   if [[ "$dry_run" -eq 1 ]]; then
     echo "[dry-run] ssh ${ssh_target} -- qm importdisk ${vmid} ${remote_path} ${storage}"

scripts/secrets/sync-nix-cache-host-key.sh

@@ -0,0 +1,110 @@
+#!/usr/bin/env bash
+# Detects and fixes drift between the ed25519 SSH host key nix-cache is
+# actually serving right now and vars.nixCacheHostKey (variables.nix) --
+# the value modules/nix-cache/remote-builder-client.nix bakes into every
+# client's declarative programs.ssh.knownHosts, and
+# scripts/proxmox/configure-nix-cache-client.sh hardcodes as its own
+# default for non-NixOS clients.
+#
+# This value has no automatic source of truth: nix-cache's host key is
+# generated once (first boot / container recreate) and never touches this
+# repo again unless someone remembers to update it by hand afterwards. It
+# drifted silently once already -- confirmed live: variables.nix recorded
+# a key that no longer matched what nix-cache actually presented, which
+# would fail every real client's SSH host-key verification for
+# distributed builds without ever producing an obvious error pointing
+# back here (a client just sees "Host key verification failed" against
+# *some* key, with no hint that the trusted value itself was stale).
+#
+# codex-maintenance.sh runs this in --check mode on every invocation so
+# that drift surfaces as a warning instead of a future debugging session.
+#
+# Usage:
+#   scripts/secrets/sync-nix-cache-host-key.sh [--check] [--dry-run] [--host <name>]
+#
+#   --check     Only report drift (exit 1 if found, 2 if nix-cache is
+#               unreachable); never writes. For CI/maintenance use.
+#   --dry-run   Show what would change; never writes.
+#   --host      Override the hostname to scan (default: variables.nix's
+#               nixCacheHost / env.sh's NIX_CACHE_HOST).
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "$0")/../.." && pwd)"
+variables_nix="${repo_root}/variables.nix"
+client_script="${repo_root}/scripts/proxmox/configure-nix-cache-client.sh"
+
+# shellcheck source=../env.sh
+source "${repo_root}/scripts/env.sh"
+
+check_only=0
+dry_run=0
+host="${NIX_CACHE_HOST}"
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --check) check_only=1; shift ;;
+    --dry-run) dry_run=1; shift ;;
+    --host)
+      host="${2:?--host requires a hostname}"
+      shift 2
+      ;;
+    -h|--help)
+      sed -n '2,23p' "$0"
+      exit 0
+      ;;
+    *)
+      echo "ERROR: unknown argument: $1" >&2
+      exit 1
+      ;;
+  esac
+done
+
+current_value="$(grep -oE 'nixCacheHostKey = "[^"]+"' "$variables_nix" | sed -E 's/nixCacheHostKey = "(.*)"/\1/')"
+if [[ -z "$current_value" ]]; then
+  echo "ERROR: couldn't find nixCacheHostKey in $variables_nix" >&2
+  exit 1
+fi
+current_type_blob="$(awk '{print $1, $2}' <<<"$current_value")"
+current_label="$(awk '{print $3}' <<<"$current_value")"
+
+echo "Scanning ${host} for its current ed25519 SSH host key..."
+nix_extra_opts
+scanned="$(nix-shell "${NIX_OPTS[@]}" -p openssh --run "ssh-keyscan -t ed25519 -T 5 '${host}'" 2>/dev/null | grep -v '^#' | head -1 || true)"
+if [[ -z "$scanned" ]]; then
+  echo "ERROR: couldn't reach ${host} (or got no ed25519 host key back) via ssh-keyscan." >&2
+  exit 2
+fi
+scanned_type_blob="$(awk '{print $2, $3}' <<<"$scanned")"
+
+if [[ "$current_type_blob" == "$scanned_type_blob" ]]; then
+  echo "Up to date: ${host}'s host key matches variables.nix's nixCacheHostKey."
+  exit 0
+fi
+
+echo "DRIFT DETECTED:"
+echo "  variables.nix has: $current_type_blob"
+echo "  ${host} is now:    $scanned_type_blob"
+
+if [[ "$check_only" -eq 1 ]]; then
+  echo
+  echo "Run 'scripts/secrets/sync-nix-cache-host-key.sh' (no flags) to fix." >&2
+  exit 1
+fi
+
+new_value="${scanned_type_blob} ${current_label}"
+
+if [[ "$dry_run" -eq 1 ]]; then
+  echo "(--dry-run: would update variables.nix and ${client_script##*/} to:)"
+  echo "  $new_value"
+  exit 0
+fi
+
+sed -i "s|nixCacheHostKey = \"[^\"]*\"|nixCacheHostKey = \"${new_value}\"|" "$variables_nix"
+sed -i "s|NIX_CACHE_HOST_KEY:=[^}]*}|NIX_CACHE_HOST_KEY:=${new_value}}|" "$client_script"
+
+echo "Updated variables.nix and ${client_script##*/} to:"
+echo "  $new_value"
+echo
+echo "This only takes effect on already-deployed NixOS clients after their"
+echo "next rebuild (programs.ssh.knownHosts is declarative). Review with"
+echo "'git diff', then run 'bash scripts/codex-maintenance.sh' before committing."

secrets/common.yaml

@@ -5,85 +5,103 @@ sops:
     age:
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBaMUpxYmUzaVY4d1pRY3g3
-            empaVUJSN0JaSlNQQlJtZENwc0VMYVhJSkFvCmJQMkpSd3RoYzlKQjBSZWErQzR2
-            aG5SVndOQWpSRTBDSWJVQkg0c0hiNFUKLS0tIHhiaEdpY3gwZkpCcHl2TW5CNThn
-            aVVUQy9Qd0trb0RNdUpVTXdrdGlrTmcK1uphQAyDV+Gk5+K1YOqw1Z8ynGP5sAPF
-            q5icujja/SGexX18hPYXbkyUtOrBYjW62gCuGJinSBPROoFUJbiP7g==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSAzdUlybVpDamVxYk94MDEv
+            VjNiVjJkWjZvYjN1SUhMSG5ZOS91a3FrNDJRCi9IQWh4RVdwdkhwQjd6TTBhcW9J
+            alhLMlArM1VvVkE5VUxOQ1ZWNmw2SmcKLS0tIFRvWklUN0xxSFdKSk1vakExQ3Rv
+            OWpmSGRTUHlvVysvR2N4UHRYWHgvMHMKqapmFB4ct1FTPa1hMWyylvLycUvOEFop
+            enZI5SV1F86HOTEhK0QbnEW3jMl4ZXOtAlwcys2oE9a783MSgVPxeg==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1njap586hc0q43kr03g6c8eqhdsmk8zcafkl3f83xwlc2gqhlmfgs4tmwad
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBKOWZxcFlhRHhKelhDS29M
-            NGRlTEhJUGUzcFV6QVFCdTNkdEN3MlljWnl3CnI3LzVxSHBwSi9TYlRUcFdyN2py
-            cVZBV0Q3Z3FhRXA0T1NFQzd2R00yeEUKLS0tIHkxL2dHV3RkVFYxZTJNTVZvVFIr
-            TXpJZzdnYlpJaXBmcjdWWUtxNkc4dWMKVsImJiavzUzSFn78pciNJPHaS3KWqJer
-            VkxF6kF3tl2HmW46eVXtsQowdu+zVR9HS35i/HvQ1r1TyP6qT5ofcQ==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBEc0lHazMrVUR2UUlaQ21O
+            T2Jha0EvUmJzVC96Wksxay9GVlEwU2lZWVRRClBQdWVqTjNTYnBrQldMeWR0dWNz
+            QTN6T0VtQzhpM3UwKzVjUjl0Rkp4VzQKLS0tIEg5VzhUT1VTamQzZjNYT2orMnY0
+            Q1BpNzI2cVk3by9Ic3lrQ25sM05YMlkKXVofmCu7iI/my1o47p2eUzhXuP/V0NS8
+            mmIerz2v2uUwoS252qSU4a2vmxPOgWM0Os1vWsYamsapofQc6TaU2Q==
             -----END AGE ENCRYPTED FILE-----
           recipient: age19gfn2yedg76dmztm4hncr7vf3r3c9j0qpt4rap7y7gersjk4m3ks2lhd0e
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSAyWjdSanRRaEI4VHFZVkdw
-            NkxMODRuakFJTFNoTHZIRHptZFNxaGZ3K3lnCjJGR1FJalRsYmtLcHFxZW8yNU5W
-            MzBjWmltbzI3MTByUjB6djlEdllHNXMKLS0tIEhEOVhLVjZkRi9vUEtDWUhxT0NX
-            eUZ3bGdEaHdGbXZIYkowYUZuTWJ3d2MKMwgxOqlMH7GfLlseD4J277Dcg0KCD3d5
-            jwJDb82kRWoBMicTJZXoq/5oe5blJNa7dWYoqgkYxMA2O+0igT+I6g==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBYZHVnTEk2SjUwdTdKdWNV
+            dVFPNDFvdzY2VUlzMU5nK0t0UlUxU3Ewa0g0CjJCd0ZrMjhRZldaUDNIS1pGZTZn
+            Z2h2MEJ6TUpna1NNdXl4R3d1S1djVDQKLS0tIFJqMlZ3b0Zzalp2N0hIc0NHMzU4
+            RGRoVjdvMEkxam9DRzdYaW16enAyQ3cKUZTDqvWnmEMKHhI430coKHw3raIiD/o1
+            1BtDWOmKFFcuaF5mRx/qTUjEwU5OZWOujqLSPoVbmsbhyxsG3XQSHg==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1ll6hj5ggruetgjwjfnplpn5xtq35uhlcdflksx3xmnjm6s3uad9sz70jkf
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBsZzdRMm9zdlJHckFoREVs
-            UkVXL3dCeWRuN2NqcnVsOWVNT1FLUHY3andrCmNFY0ZCby9SdnUyYlV6R05YNDB0
-            em43SjRCNVhYbmpRZUVWT0cxQlhGdmsKLS0tIDZHazNyck5VNHBuNVM5bmRZUlpR
-            QzBSNy84VDdLVkZZbnNlUFYydXlreEEKYZaR2b7tyRAhPdP+ytpP0veUTi7pY9Nw
-            pK0h4hcegLNYJL1AfOYwFQoW7vb256GdmwdcuuBl1YBGXWGraaBnZg==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBzbXdrajlVQU5RditMckh6
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             -----END AGE ENCRYPTED FILE-----
           recipient: age120le4a5l8dh3lyfgvmj3d9ksmej6ajs5mer5y7r0vfg3x9fn69dqf8xgzu
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBFSnZiOGpsL1BESWVEdUxx
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             -----END AGE ENCRYPTED FILE-----
-          recipient: age1qz9d4ka4xgexujyd247s7lp737sulp5fhxl5d65fj2ykvc4j4edqrsdks8
+          recipient: age1jy444f9d9stygj4p3w9kh54cqcfr654tvr75tdvee5cxsgtdtc9q3v60ep
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
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             -----END AGE ENCRYPTED FILE-----
           recipient: age120whqj96g26lsgy4udvgsn8dc9lumh8jeu3a564fx79rjr5lxffqmrljuu
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBnNFlzYVBqaGFDVE9xbmt5
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+            YsG74ez3piUQ1rdJRi0e29QWz4xL3JeU9oE+tr0rMB6WvgTmuX5gwQ==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1xjst4frdh0th6q8m7p7u9g5af7ty5jqeum0p6z8a52a9q7st7ewqw8yl9j
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBkcmVQYXV1NzRrQ2IxTElt
-            QUJRMkhiUUJqRDdwQW03K0lCTEtkSTU5UDJrCjh6SldpQkF1NzIybTJTdnBlOHdQ
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             -----END AGE ENCRYPTED FILE-----
           recipient: age10at8862478urh0eeuwh8hzln6ck78jgwtztgxatwqlzwagg77y5snm4xzg
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSA0WjJPbXhXNTNyQUZzMmxS
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             -----END AGE ENCRYPTED FILE-----
           recipient: age1ezk9x53zt8kcnscdm80jcyf0xq97vndv7jsn3rl8cc0cwm2jmpmq372dzs
+        - enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
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+            AvCw9jc7Hsbs6+LoZ45K1QKoWoZmBkmAatbksXo3jnAzEHmcQqODKQ==
+            -----END AGE ENCRYPTED FILE-----
+          recipient: age1fxxzpnfse8nd9wz78ht3m0plrmraacf4cpga0pe8fm2tdnqcgy8q7qsyvp
+        - enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBtWGRLTCt5dXZMR1d6a3lD
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+            XL4FpBsJ5+MnxTx1O/bu6/f7OvZqfnxhQv0lkKOMJnkZfPZx5D+meg==
+            -----END AGE ENCRYPTED FILE-----
+          recipient: age190htw7prp4vln076dxjx3gxxaq06h0zl0te7cqgpx79vl3lhkaes8suy05
     lastmodified: "2026-07-19T02:30:40Z"
     mac: ENC[AES256_GCM,data:UiL3VMDF6rq4Nr87KspcDx434q3tfNXeb5pwH2O+4ssNQ6xzcYDdzXBnhAY3zLBsqPMKrvHBd4Ot/gEMcq3FMIVe7Q6p9yWKpep66KZ/yWEhAlwIVhD79Oj8VS+1CHKjf25zpRdhZorp04oeFQQd9VfjJB4EE/Q1aVbwTGlpIic=,iv:i/0conaFgFia+wzNTdUL6tlSTw35HTK3Ap1Sr5RGHf8=,tag:ULbz5FllShA/JjlSRdxA0g==,type:str]
     unencrypted_suffix: _unencrypted

variables.nix

@@ -26,7 +26,7 @@
   # fresh client that has never manually ssh'd to nix-cache before. Update
   # this if nix-cache's host key is ever rotated or the host is rebuilt
   # from scratch.
-  nixCacheHostKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHrMKZlIGUd3pH9G3AqbsruqUGjxIXMAZw52u9MwiBCn lxc-nix-cache";
+  nixCacheHostKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPeWgMsdaiz4axT/deFc1+0B5bN+GX/NOeW9bbQ0c/IT lxc-nix-cache";
 
   # 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