diff --git a/cluster/staging/node/cariacou.nix b/cluster/staging/node/cariacou.nix
index 04e581d..818a88e 100644
--- a/cluster/staging/node/cariacou.nix
+++ b/cluster/staging/node/cariacou.nix
@@ -22,14 +22,21 @@
   deuxfleurs.cluster_ip = "10.14.1.1";
   deuxfleurs.is_raft_server = true;
 
-  # experimental: nomad as root, to enable exec driver
+  # ----
+
+  # experimental: config for nomad nix driver
   services.nomad.dropPrivileges = false;
   services.nomad.extraPackages = [
     pkgs.nix
+    pkgs.git
   ];
   services.nomad.extraSettingsPlugins =
     let nomad_driver_nix = import ./nomad-driver-nix.nix { inherit pkgs; };
     in [ nomad_driver_nix ];
   # the nix driver requires flakes to be enabled
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  # use our cache as additionnal substituer
+  nix.settings.substituers = [ "https://nix.web.deuxfleurs.fr" ];
+  nix.settings.trusted-public-keys = [ "nix.web.deuxfleurs.fr:eTGL6kvaQn6cDR/F9lDYUIP9nCVR/kkshYfLDJf1yKs=" ];
 }