1RPC.YPXFRD(8) NIS Reference Manual RPC.YPXFRD(8)
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6 rpc.ypxfrd - NIS map transfer server
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9 /usr/sbin/rpc.ypxfrd [-d path] [-p port] [--debug]
10 /usr/sbin/rpc.ypxfrd --version
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14 rpc.ypxfrd is used for speed up the transfer of very large NIS maps
15 from a NIS master to the NIS slave server. If a NIS slave server
16 receives a message that there is a new map, it will start ypxfr for
17 transfering the new map. ypxfr will read the contents of a map from
18 the master server using the yp_all() function.
19 The rpc.ypxfrd server speeds up the transfer process by allowing NIS
21 slave servers to simply copy the master servers map files rather than
22 building their own from scratch. rpc.ypxfrd uses an RPC-based file
23 transfer protocol.
24 If the on-disk format of the database on both machines is not the same,
26 rpc.ypxfrd will refuse to send the data and ypxfr will fallback to
27 yp_all() and fetch every single entry alone.
28 rpc.ypxfrd could be started by inetd. But since it starts very slowly,
30 it should be started after ypserv from /etc/init.d/ypxfrd.
31 It is possible to pass OPTIONS to rpc.ypxfrd using the environment
33 variable YPXFRD_ARGS and this variable can be set in
34 /etc/sysconfig/network.
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37 --debug
38 Causes the server to run in debugging mode. In debug mode, the
39 server does not background itself and prints extra status messages
40 to stderr for each request that it revceives.
41 -d path
43 rpc.ypxfrd is using this directory instead of /var/yp.
44 -p port
46 rpc.ypxfrd will bind itself to this port, which makes it possible
47 to have a router filter packets to the NIS ports. This can
48 restricted the access to the NIS server from hosts on the Internet.
49 --version
51 Prints the version number
52
54 rpc.ypxfrd uses the same functions for checking a host as ypserv. At
55 first, rpc.ypxfrd will check a request from an address with
56 /var/yp/securenets or the tcp wrapper. If the host is allowed to
57 connect to the server, rpc.ypxfrd will uses the rules from
58 /etc/ypserv.conf to check the requested map. If a mapname doesn't match
59 a rule, rpc.ypxfrd will look for the YP_SECURE key in the map. If it
60 exists, rpc.ypxfrd will only allow requests on a reserved port.
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63 The FreeBSD ypxfrd protocol is not compatible with that used by SunOS.
64 This is unfortunate but unavoidable: SUNs protocol is not freely
65 available, and even if it were it would probably not be useful since
66 the SunOS NIS v2 implementation uses the original ndbm package for its
67 map databases whereas the other implementation uses GNU DBM or Berkeley
68 DB. These packages uses vastly different file formats. Furthermore,
69 ndbm and gdbm are byte-order and word width sensitive and not very
70 smart about it, meaning that a gdbm or ndbm database created on a big
71 endian or 64bit system cannot be read on a little endian or 32bit
72 system. The FreeBSD ypxfrd protocol checks, if both, master and slave,
73 uses the same database packages and, if necessary, the byte order of
74 the system.
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77 /etc/ypserv.conf
78 Configuration file for options and access rights
79 /var/yp/securenets
81 Configuration file for access rights
82 /etc/sysconfig/network
84 Setting additional arguments to rpc.ypxfrd
85
87 ypserv(8), makedbm(8), yppush(8), ypxfr(8)
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90 ypxfrd protocol and FreeBSD Implementation: Bill Paul
91 <wpaul@ctr.columbia.edu>
92 Linux Implementation: Thorsten Kukuk <kukuk@linux-nis.org>
94NIS Reference Manual 01/31/2020 RPC.YPXFRD(8)