Setup Impermanence

nixos/roles/default.nix

@@ -56,5 +56,5 @@ services = {
       PasswordAuthentication = false;
     };
   };
-  };
+};
 }

nixos/roles/prometheusNodeExporter.nix

@@ -1,3 +1,4 @@
+{config, ...}:
 {
   imports = [ ];
   services.prometheus.exporters.node = {
@@ -33,4 +34,5 @@
     ];
   };
   networking.firewall.allowedTCPPorts = [ 9100 ];
+  environment.persistence.${config.impermanence.name}.directories = [ "/var/lib/${config.services.prometheus.stateDir}" ];
 }