NAME
ypbind - NIS binding process
SYNOPSIS
ypbind
[
R -c
] [
R -d | -debug
] [
-broadcast
] [
-broken-server
] [
-ypset
] [
-ypsetme
] [
-no-ping
] [
R -f configfile
] [
-local-only
] [
R -ping-interval ping-interval
] [
-no-dbus
]
ypbind
R --version
DESCRIPTION
ypbind
finds the server for NIS domains and maintains the NIS binding
information. The client (normally the NIS routines in the standard C library)
could get the information over RPC from
ypbind
or read the binding files. The binding files resides in the directory
/var/yp/binding
and are conventionally named
R [domainname].[version] .
The supported versions are 1 and 2.
There could be several such files since it is possible for an NIS client
to be bound to more than one domain.
After a binding has been established,
ypbind
will send YPPROC_DOMAIN requests to the current NIS server at 20 seconds
intervals. If it doesn't get an response or the NIS server reports that he
doesn't have this domain any longer,
ypbind
will search for a new NIS server. All 15 minutes
ypbind
will check to see if the current NIS server is the fastest. If it find
a server which answers faster, it will switch to this server.
You could tell
ypbind
to use network broadcasts to find a new server, what is insecure,
or you could give it a list of known secure servers.
In this case
ypbind
will send a ping to all servers and binds to first one which answers.
Unless the option
-debug
is used, ypbind detaches itself from the controlling terminal and puts
itself into background.
ypbind
uses
syslog(3)
for logging errors and warnings.
At startup or when receiving signal SIGHUP,
ypbind
parses the file
/etc/yp.conf
and tries to use the entries for its initial binding.
A broadcast entry in the configuration file will overwrite a ypserver/server
entry and a ypserver/server entry broadcast. If all given server are down,
ypbind
will
not
switch to use broadcast.
ypbind
will try at first
/etc/hosts
and then
DNS
for resolving the hosts names from
R /etc/yp.conf .
If
ypbind
couldn't reconfigure the search order, it will use only
R DNS .
If
DNS
isn't available, you could only use IP-addresses in
R /etc/hosts .
ypbind
could only reconfigure the search order with glibc 2.x.
If the
-broadcast
option is specified,
ypbind
will ignore the configuration file.
If the file does not exist or if there are no valid entries,
ypbind
exit.
This
ypbind
version listens for DBUS messages from NetworkManager. If no NetworkManager
is running at startup,
ypbind
will behave as usual and assumes there is a working network
connection. If NetworkManager is running on the system, ypbind will only
search and provide NIS informations, if NetworkManager tells that a network
connection is available. If NetworkManager establishes a connection,
ypbind
will reread all configuration files, registers at the local portmapper and
try to search NIS servers. If NetworkManager drops a connection,
ypbind
will unregister from portmapper.
OPTIONS
-broadcast
Send a broadcast to request the information needed to bind to a
specific NIS server. With this option,
/etc/yp.conf
will be ignored.
-ypset
Allow
root
from any remote machine to change the binding for a domain via the
ypset(8)
command. By default, no one can change the binding. This option is really
insecure. If you change a binding for a domain, all the current known
servers for this domain will be forgotten. If the new server goes down,
ypbind
will use the old searchlist.
-ypsetme
The same as
R -ypset ,
but only
root
on the local machine is allowed to change the binding. Such requests
are only allowed from
R loopback .
-c
ypbind
only checks if the config file has syntax errors and exits.
-debug
starts
ypbind
in debug mode.
ypbind
will not put itself into background, and error messages and debug
output are written to standard error.
-broken-server
lets
ypbind
accept answers from servers running on an illegal port number. This should
usually be avoided, but is required by some
ypserv(8)
versions.
-no-ping
ypbind
will not check if the binding is alive. This option is for use with
dialup connections to prevent
ypbind
from keeping the connection unnecessarily open or causing autodials.
R -f configfile
ypbind
will use
configfile
and not
/etc/yp.conf
-local-only
ypbind
will only bind to the loopback device and is not reachable from
a remote network.
R -ping-interval ping-interval
The default value for
to check, if a NIS server is still reachable, is 20 seconds.
With this options another frequency in seconds can be specified.
-no-dbus
Disables DBUS support if compiled int.
--version
Prints the version number
FILES
/etc/yp.conf
configuration file.
I /var/yp/binding/[domainname].[version]
binding file containing information about each NIS domain.
/var/run/ypbind.pid
contains the process id of the currently running
ypbind
master process.
SEE ALSO
AUTHOR
ypbind-mt
was written by Thorsten Kukuk <kukuk@suse.de>.
ČLÁNKY DO MAILU