modules/microvm: c3d2.deployment.server = "nomad"

hosts/containers/leon/default.nix

@@ -9,6 +9,7 @@ in
   };
 
   c3d2.deployment = {
+    server = "nomad";
     mounts = [ "etc" "home" "var"];
     mountBase = "/glusterfs/fast/microvms/${config.networking.hostName}";
   };

hosts/containers/mucbot/default.nix

@@ -2,7 +2,7 @@
 
 {
   c3d2.deployment = {
-    server = "server10";
+    server = "nomad";
     mounts = [];
     mountBase = "/glusterfs/fast/microvms/${config.networking.hostName}";
   };

modules/microvm.nix

@@ -29,9 +29,12 @@ in
 {
   options.c3d2.deployment = with lib; {
     server = mkOption {
-      type = with types; nullOr (enum [ "server9" "server10" ]);
+      type = types.enum [ "server9" "server10" "nomad" ];
       default = null;
-      description = "Server that is supposed to host this MicroVM.";
+      description = ''
+        Server that is supposed to host this MicroVM,
+        or \"nomad\" for HA clustering.
+      '';
     };
 
     autoNetSetup = mkOption {
@@ -58,6 +61,17 @@ in
     };
   };
 
+  config.assertions = [ {
+    assertion =
+      config.c3d2.deployment.server == "nomad" ->
+      config.c3d2.deployment.mounts == [] ||
+      lib.hasPrefix "/glusterfs" config.c3d2.deployment.mountBase;
+    message = ''
+      Host \"${config.networking.hostName}\" is to be run on nomad
+      but its mountBase is not located on /glusterfs/...!
+    '';
+  } ];
+
   config.system.build = with pkgs; {
     copyToServer = writeScript "copy-to-${server}" ''
       #! ${runtimeShell} -e