registrar(1M) registrar(1M)
registrar - IP address update command for NIS hosts data base
registrar host-file "make hosts"
registrar, which runs on a NIS master only, is a NIS hostname data base
update program. A hostname registration request can be sent from either
the yp_host(1M) command, or from the PROM IP address auto-registration
function. This requests is initially sent to a RPC daemon process
rpc.ypupdated(1M). registrar is invoked indirectly by rpc.ypupdated(1M)
by an intermediate make file updaters(4).
The host-file parameter should be the host file that is used in NIS
database makefile, /var/yp/Makefile. Usually, it is /etc/hosts.
registrar knows how to receive the input parameters from
rpc.ypupdated(1M). The input parameters tell registrar whether to
allocate a new IP address, to change the existing hostname entry, or to
delete the entry, along with the necessary information to service the
request.
When adding a new hostname entry, there is no authentication checking.
As long as the new hostname and the aliases are not yet used, the
registration request is always executed. When changing or deleting
hostname entry, the NIS master root password has to be passed along with
the command.
The new IP address is selected with the first available address that is
in the same network/subnet specified in the request. The system
administrator can, however, mark a specific range in the /etc/hosts for
address allocation by a special comment line. The format of this line
should be
# registrar start=xxx end=yyy mask=0xzzzzzzzz
where xxx is the IP address with the smallest local network address in
the range, yyy is the IP address with largest local network address in
the range, and zzzzzzzz is the 8-byte hexadecimal mask value. xxx and
yyy must fall into the same network, or the same subnet if netmask is
specified.
There can be several lines of comment for the address allocation for the
same network or subnet. registrar uses the first available address by
searching through the comment lines sequentially. In case all address
ranges described by the comment lines are used, registrar chooses the
lowest available IP address that is in the same network or subnet.
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registrar(1M) registrar(1M)
FILES
/etc/hosts
/var/yp/updaters
Use
#registrar start=192.26.1.10 end=192.26.1.20 mask=0xffffff00
to reserve 192.26.1.10 through 192.26.1.20 for network 192.26.1.
yp_host(1M), ypupdated(1M), updaters(4).
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