Add journald limit of 500M

configuration.nix

@@ -76,6 +76,7 @@ in
       options = "--delete-older-than 7d";
     };
   };
+  services.journald.extraConfig = "SystemMaxUse=500M";
   boot.kernel.sysctl = {
     "net.ipv4.ip_forward" = 1;
   };