listenHost = mkOption {
        default = "*";
        example = "localhost";
        description = ''
          The hostname or address to listen on or <literal>*</literal> to listen
          on all interfaces.
        '';
      };

          { ExecStart = "@${cfg.hydra}/bin/hydra-server hydra-server -f -h \* --max_spare_servers 5 --max_servers 25 --max_requests 100${optionalString cfg.debugServer " -d"}";

          { ExecStart = "@${cfg.hydra}/bin/hydra-server hydra-server -f -h '${cfg.listenHost}' --max_spare_servers 5 --max_servers 25 --max_requests 100${optionalString cfg.debugServer " -d"}";