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yp_mkdb(8)

NAME

     yp_mkdb -- generate the NIS databases

SYNOPSIS

     yp_mkdb -c
     yp_mkdb -u dbname
     yp_mkdb [-c] [-b] [-s] [-f] [-i inputfile] [-o outputfile]
	     [-d domainname] [-m mastername] inputfile dbname

DESCRIPTION

     The yp_mkdb utility creates db(3) style databases for use with FreeBSD's
     NIS server.  The yp_mkdb utility reads data from inputfile, and writes it
     to dbname in db(3) format (using the hash table method).  The input
     should be in 'key data' format, which is to say two fields of ASCII data
     separated by white space.	The first field is assumed to be the key, and
     everything else is assumed to be the data.  These databases are typically
     stored in /var/yp/[domainname] where domainname is the name of the NIS
     domain being served.  The yp_mkdb utility is usually invoked by
     /var/yp/Makefile.	The yp_mkdb utility can also be used to dump an NIS
     database file so that its contents can be examined.  For security rea-
     sons, all databases that yp_mkdb creates are readable and writable by
     owner only (and usually the owner is root).

     The following options are available:

     -c      Cause yp_mkdb to send a YPPROC_CLEAR request to ypserv(8) on the
	     local host.  This signal tells the server to close any open data-
	     base descriptors and flush out its database cache.  If used
	     alone, this flag signals the server and does nothing else.  If
	     used as part of a database creation command, yp_mkdb will send
	     the signal only after the new database has been successfully cre-
	     ated.

     -b      Cause yp_mkdb to add a special entry to the database with a key
	     of YP_INTERDOMAIN and an empty data field.  If this key is
	     present in a map, it alters the behavior of the 'match' procedure
	     in ypserv(8) slightly.  If a match query fails (because the
	     server couldn't find a record that matched the supplied key), and
	     the YP_INTERDOMAIN key exists within the queried map, ypserv(8)
	     will try to match the entry again using a DNS lookup.  Note that
	     this special behavior only applies to the hosts maps.  Using the
	     -b flag for other maps has no effect.

     -s      This flag is used to add a special entry to the database with a
	     key of YP_SECURE and an empty data field.	If this key is present
	     in a map, ypserv(8) will deny access to the map to any client
	     that is not using a reserved port for its query.  This is used
	     mainly for the master.passwd maps, which should be restricted to
	     privileged access only.

     -f      This flag is used to turn on filtering of lines in the source
	     file input that start with ``+'' or ``-'' characters.  These
	     characters have special meaning for the group, passwd and
	     master.passwd maps and hence should not be allowed to appear in
	     them as the first character of a key or datum.  If the -f flag is
	     used, yp_mkdb will reject any source line that starts with a
	     ``+'' or ``-'' character and issue a warning message displaying
	     in the database with a key of YP_INPUT_FILE.

     -o outputfile
	     When generating an NIS map, encode outputfile as a special entry
	     in the database with a key of YP_OUTPUT_FILE.

     -d domainname
	     When generating an NIS map, encode domainname as a special entry
	     in the database with a key of YP_DOMAIN_NAME.

     -m mastername
	     When generating an NIS map, encode mastername as a special entry
	     in the database with a key of YP_MASTER_NAME.  This entry in the
	     database is frequently used by various NIS utilities to determine
	     the name of an NIS master server for a domain.  By default,
	     yp_mkdb assumes that the local host is the NIS master; the -m
	     option is used to override this default.

FILES

     /var/yp/Makefile  the Makefile that calls yp_mkdb to build the NIS data-
		       bases

SEE ALSO

     db(3), ypserv(8)

AUTHORS

     Bill Paul <wpaul@ctr.columbia.edu>

FreeBSD 5.4			March 12, 1996			   FreeBSD 5.4

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