krb5kdc: invalid option -- '-'
usage: krb5kdc [-x db_args]* [-d dbpathname] [-r dbrealmname]
		[-T time_offset] [-m] [-k masterenctype]
		[-M masterkeyname] [-p port] [-P pid_file]
		[-n] [-w numworkers] [/]

where,
	[-x db_args]* - Any number of database specific arguments.
			Look at each database module documentation for 			supported arguments