yp_mkdb — generate
the NIS databases
yp_mkdb |
[-c] [-b]
[-s] [-f]
[-i inputfile]
[-o outputfile]
[-d domainname]
[-m mastername]
inputfile dbname |
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 reasons,
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 database 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 created.
-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 could not 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 the line that was dropped.
-u
dbname- Dump (or 'unwind') an NIS database. This option can be used to inspect the
contents of an existing NIS database.
-i
inputfile- When generating an NIS map, encode inputfile as a
special entry 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.
- /var/yp/Makefile
- the Makefile that calls
yp_mkdb to build the NIS
databases