ypbind service:
Name Server for Sun's YP server. Disabled unless you are using and NIS server, usually for password authentication
Now lets see the manual of ypbind service.
Manual ypbind:NAMEypbind - NIS binding process
SYNOPSISypbind [ -c ] [ -d|-debug ] [ -broadcast ] [ -broken-server ] [ -ypset ] [ -ypsetme ] [ -no-ping ] [ -f configfile
]
ypbind --version
DESCRIPTIONypbind finds the server for NIS domains and maintains the NIS binding information. The client (normaly 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 then 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 tells that he doesn't has this domain any longer,
ypbind will search a new NIS server. All 15 minutes ypbind will check, 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 server 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. Valid entries are
domain nisdomain server hostname
Use server hostname for the domain nisdomain. You could have more then one entry of this type for a single
domain.
domain nisdomain broadcast
Use broadcast on the local net for domain nisdomain.
ypserver hostname
Use server server for the local domain.
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 is a special version which uses pthreads. It will start 2 more threads. The master process services
RPC requests asking for binding info. The first thread initializes the binding and checks it periodically. Upon
failure, the binding is invalidated and the process tries again to find a valid server. The second thread will handle
all the signals.
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 chang the binding. Such requests are
only allowd 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
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 unnessecarily open or causing autodials.
-f configfile
ypbind will use configfile and not /etc/yp.conf
--version
Prints the version number
NOTESBinding to multiple domains is tested and works. Load sharing between multiple servers for a single domain is not
supported. ypbind will always try to bind a domain to a server. If there is no valid server in the list or answers
to a broadcast, the domain is unbounded.
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 ALSOsyslog(3), domainname(1), ypdomainname(8), ypwhich(1), ypserv(8), ypset(8)
AUTHORypbind-mt was written by Thorsten Kukuk <kukuk@suse.de>.