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YPSERV(8)                 BSD System Manager's Manual                YPSERV(8)

     ypserv -- YP server daemon

     ypserv [-dfl]

     ypserv is a fundamental part of the network information system called YP.
     This server provides information from YP maps to the YP clients on the

     A YP map is stored on the server as a db(3) database.  A number of YP
     maps is grouped together in a domain.  ypserv determines the domains it
     serves by looking for a directory with the domain name in /var/yp.

     In an effort to improve the security of YP (which has, historically, not
     been very good), this ypserv has support for libwrap-based access con-
     trol.  See hosts_access(5) for more information.  The daemon used for
     access control is the name which ypserv was invoked as (typically
     ``ypserv'' ).  If a host is not allowed to query this YP server, ypserv
     will return the YP result code YP_NODOM.

     The process pid of the ypserv process can be found in the file

     The options are as follows:

     -d      Use internet Domain Name System. If a query to map hosts.byname
             or hosts.byaddr fails, make a DNS query and return the result if

     -f      Run in the foreground.

     -l      Enable logging of all requests.

     All messages are sent to the system log with the facility LOG_DAEMON.
     Error messages have the priority LOG_ERR.  Refused requests are logged
     with the priority LOG_WARNING.  All other messages are logged with the
     priority LOG_INFO.


     syslog(3), hosts_access(5), syslogd(8), yp(8), ypbind(8), ypinit(8)

     This implementation of ypserv was originally written by Mats O Jansson
     <mojATstacken.se>.  The access control code was later re-written from
     scratch by
     Jason R. Thorpe <thorpejATNetBSD.org>.

BSD                              June 27, 1994                             BSD