NAME¶
ypbind - NIS binding process
SYNOPSIS¶
ypbind [
-c ] [
-d|
-debug ] [
-broadcast ] [
-broken-server ] [
-ypset ] [
-ypsetme ] [
-no-ping ] [
-f configfile ] [
-local-only ] [
-ping-interval ping-interval ] [
-no-dbus ]
ypbind --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
[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
/etc/yp.conf. If
ypbind couldn't reconfigure the search
order, it will use only
DNS. If
DNS isn't available, you could
only use IP-addresses in
/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 -ypset, but only root on the
local machine is allowed to change the binding. Such requests are only
allowed from 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.
- -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.
- -ping-interval ping-interval
- The default value for ypbind 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.
- /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¶
syslog(3),
domainname(1),
yp.conf(5),
ypdomainname(8),
ypwhich(1),
ypserv(8),
ypset(8)
AUTHOR¶
ypbind-mt was written by Thorsten Kukuk <kukuk@suse.de>.