NAME
ypserv - NIS ServerSYNOPSIS
/usr/sbin/ypserv
[-d [ path]] [-p port]
DESCRIPTION
The Network Information Service (NIS) provides a simple network lookup service consisting of databases and processes. The databases are gdbm files in a directory tree rooted at /var/yp. The ypserv daemon is typically activated at system startup. ypserv runs only on NIS server machines with a complete NIS database. On other machines using the NIS services, you have to run ypbind as client or under Linux you could use the libc with NYS support. ypbind must run on every machine which has NIS client processes; ypserv may or may not be running on the same node, but must be running somewhere on the network. On startup ypserv parses the file /etc/ypserv.conf.OPTIONS
-d, --debug [path]Causes the server to run in debugging mode.
Normally, ypserv reports only errors (access violations, dbm failures)
using the syslog(3) facility. In debug mode, the server does not background
itself and prints extra status messages to stderr for each request that it
revceives. path is an optionally parameter. ypserv is using this
directory instead of /var/yp
-p, --port port
ypserv will bind itself to this port.
This makes it possible to have a router filter packets to the NIS ports, so
that access to the NIS server from hosts on the Internet can be
restricted.
-v, --version
Prints the version number
SECURITY
In general, any remote user can issue an RPC to ypserv and retrieve the contents of your NIS maps, if he knows your domain name. To prevent such unauthorized transactions, ypserv supports a feature called securenets which can be used to restrict access to a given set of hosts. At startup ypserv will attempt to load the securenets information from a file called /var/yp/securenets . This file contains entries that consist of a netmask and a network pair separated by white spaces or network/number of bits of netmask entries. One per line. Lines starting with “#” are considered to be comments. A sample securenets file might look like this:# allow connections from local host -- necessary host 127.0.0.1 host ::1 # same as 255.255.255.255 127.0.0.1 # # allow connections from any host # on the 131.234.223.0 network 255.255.255.0 131.234.223.0 # allow connections from any host # between 131.234.214.0 and 131.234.215.255 255.255.254.0 131.234.214.0 # allow some IPv6 connections FE80::0202:B3FF::/96 # allow IPv6 connections from all machines ::/0
FILES
/etc/ypserv.confconfiguration file.
/var/yp/securenets
which hosts are allowed to contact
ypserv.
SEE ALSO
domainname(1), ypcat(1), ypmatch(1), ypserv.conf(5), netgroup(5), makedbm(8), revnetgroup(8), ypinit(8), yppoll(8), yppush(8), ypset(8), ypwhich(8), ypxfr(8), rpc.ypxfrd(8) The Network Information Service (NIS) was formerly known as Sun Yellow Pages (YP). The functionality of the two remains the same; only the name has changed. The name Yellow Pages is a registered trademark in the United Kingdom of British Telecommunications plc, and may not be used without permission.AUTHOR
ypserv was written by Peter Eriksson <[email protected]>. Thorsten Kukuk <[email protected]> added support for master/slave server and is the new Maintainer.12/31/2020 | NIS Reference Manual |