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NAME    [Toc]    [Back]

     named -- Internet domain name server (DNS)

SYNOPSIS    [Toc]    [Back]

     named [-d debuglevel] [-p port#] [-(b|c) config_file] [-f -q -r -v]
	   [-u user_name] [-g group_name] [-t directory] [-w directory]

DESCRIPTION    [Toc]    [Back]

     Named is the Internet domain name server.	See RFC's 1033, 1034, and 1035
     for more information on the Internet name-domain system.  Without any
     arguments, named will read the default configuration file
     /etc/namedb/named.conf, read any initial data, and listen for queries.  A
     config_file argument given at the end of the command line will override
     any config_file specified by using the ``-b'' or ``-c'' flags.

     NOTE: Several of named's options, and much more of its behaviour, can be
     controlled in the configuration file.  Please refer to the configuration
     file guide included with this BIND distribution for further information.

     Options are:

     -d debuglevel
		 Print debugging information.  The debuglevel is a number
		 determines the level of messages printed.  If negative,
		 debuglevel is set to ``1''.

		 NOTE: The new debugging framework is considerably more
		 sophisticated than it was in older versions of named.	The
		 configuration file's ``logging'' statement allows for multiple,
 distinct levels of debugging for each of a large set of
		 categories of events (such as queries, transfers in or out,
		 etc.).  Please refer to the configuration file guide included
		 with this BIND distribution for further information about
		 these extensive new capabilities.

     -p port#	 Use the specified remote port number; this is the port number
		 to which named will send queries.  The default value is the
		 standard port number, i.e., the port number returned by
		 getservbyname(3) for service ``domain''.

		 NOTE: Previously, the syntax ``-p port#[/localport#]'' was
		 supported; the first port was that used when contacting
		 remote servers, and the second one was the service port bound
		 by the local instance of named.  The current usage is equivalent
 to the old usage without the localport# specified; this
		 functionality can be specified with the ``listen-on'' clause
		 of the configuration file's ``options'' statement.

     -(b|c) config_file
		 Use an alternate config_file; this argument is overridden by
		 any config_file which is specified at the end of the command
		 line.	The default value is /etc/namedb/named.conf.

     -f 	 Run this process in the foreground; don't fork(2) and daemonize.
	(The default is to daemonize.)

     -q 	 Trace all incoming queries if named has been compiled with
		 QRYLOG defined.

		 NOTE: This option is deprecated in favor of the ``queries''
		 logging category of the configuration file's ``logging''
		 statement; for more information, please refer to the configuration
 file guide included with this distribution of BIND.

     -r 	 Turns recursion off in the server.  Answers can come only
		 from local (primary or secondary) zones.  This can be used on
		 root servers.	The default is to use recursion.

		 NOTE: This option can be overridden by and is deprecated in
		 favor of the ``recursion'' clause of the configuration file's
		 ``options'' statement.

     -v 	 Report the version and exit.

     -u user_name
		 Specifies the user the server should run as after it initializes.
	The value specified may be either a username or a
		 numeric user id.  If the ``-g'' flag is not specified, then
		 the group id used will be the primary group of the user specified
 (initgroups() is called, so all of the user's groups
		 will be available to the server).

     -g group_name
		 Specifies the group the server should run as after it initializes.
  The value specified may be either a groupname or a
		 numeric group id.

     -t directory
		 Specifies the directory the server should chroot() into as
		 soon as it is finished processing command line arguments.

     -w directory
		 Sets the working directory of the server.  The ``directory''
		 clause of the configuration file's ``options'' statement
		 overrides any value specified on the command line.  The
		 default working directory is the current directory (``.'').

     Any additional argument is taken as the name of the configuration file,
     for compatibility with older implementations; as noted above, this argument
 overrides any config_file specified by the use of the ``-b'' or
     ``-c'' flags.  If no further argument is given, then the default configuration
 file is used (/etc/namedb/named.conf).

   Master File Format    [Toc]    [Back]
     The master file consists of control information and a list of resource
     records for objects in the zone of the forms:

	   $INCLUDE <filename> <opt_domain>
	   $ORIGIN <domain>
	   $TTL <ttl>
	   <domain> <opt_ttl> <opt_class> <type> <resource_record_data>


     domain	   is ``.'' for root, ``@'' for the current origin, or a standard
 domain name. If domain is a standard domain name that
		   does not end with ``.'', the current origin is appended to
		   the domain. Domain names ending with ``.'' are unmodified.

     opt_domain    This field is used to define an origin for the data in an
		   included file.  It is equivalent to placing an $ORIGIN
		   statement before the first line of the included file.  The
		   field is optional.  Neither the opt_domain field nor
		   $ORIGIN statements in the included file modify the current
		   origin for this file.

     ttl	   A integer number that sets the default time-to-live for
		   future records without an explicit ttl.

     opt_ttl	   An optional integer number for the time-to-live field.  If
		   not set the ttl is taken from the last $TTL statement.  If
		   no $TTL statement has occurred then the SOA minimum value
		   is used and a warning is generated.

     opt_class	   The object address type; currently only one type is supported,
 IN, for objects connected to the DARPA Internet.

     type	   This field contains one of the following tokens; the data
		   expected in the resource_record_data field is in parentheses:

			 A	    a host address (dotted-quad IP address)

			 NS	    an authoritative name server (domain)

			 MX	    a mail exchanger (domain), preceded by a
				    preference value (0..32767), with lower
				    numeric values representing higher logical

			 CNAME	    the canonical name for an alias (domain)

			 SOA	    marks the start of a zone of authority
				    (domain of originating host, domain
				    address of maintainer, a serial number and
				    the following parameters in seconds:
				    refresh, retry, expire and minimum TTL
				    (see RFC 883 and RFC 2308)).

			 NULL	    a null resource record (no format or data)

			 RP	    a Responsible Person for some domain name
				    (mailbox, TXT-referral)

			 PTR	    a domain name pointer (domain)

			 HINFO	    host information (cpu_type OS_type)

     Resource records normally end at the end of a line, but may be continued
     across lines between opening and closing parentheses.  Comments are
     introduced by semicolons and continue to the end of the line.

     NOTE: There are other resource record types not shown here.  You should
     consult the BIND Operations Guide (``BOG'') for the complete list.  Some
     resource record types may have been standardized in newer RFC's but not
     yet implemented in this version of BIND.

   SOA Record Format    [Toc]    [Back]
     Each master zone file should begin with an SOA record for the zone.  An
     example SOA record is as follows:

     @	     IN      SOA     ucbvax.Berkeley.EDU. rwh.ucbvax.Berkeley.EDU. (
				     1989020501      ; serial
				     10800   ; refresh
				     3600    ; retry
				     3600000 ; expire
				     86400 ) ; minimum

     The SOA specifies a serial number, which should be incremented each time
     the master file is changed.  Note that the serial number can be given as
     a dotted number, but this is a very unwise thing to do since the translation
 to normal integers is via concatenation rather than multiplication
     and addition.  You can spell out the year, month, day of month, and 0..99
     version number and still fit inside the unsigned 32-bit size of this
     field.  (It's true that we will have to rethink this strategy in the year
     4294, but we're not worried about it.)

     Secondary servers check the serial number at intervals specified by the
     refresh time in seconds; if the serial number changes, a zone transfer
     will be done to load the new data.  If a master server cannot be contacted
 when a refresh is due, the retry time specifies the interval at
     which refreshes should be attempted.  If a master server cannot be contacted
 within the interval given by the expire time, all data from the
     zone is discarded by secondary servers.  The minimum value is the cache
     time-to-live for negative answers (RFC 2308).

NOTES    [Toc]    [Back]

     The boot file directives ``domain'' and ``suffixes'' have been obsoleted
     by a more useful, resolver-based implementation of suffixing for partially-qualified
 domain names.  The prior mechanisms could fail under a
     number of situations, especially when then local nameserver did not have
     complete information.

     The following signals have the specified effect when sent to the server
     process using the kill(1) command:

     SIGHUP    Causes server to read named.conf and reload the database.  If
	       the server is built with the FORCED_RELOAD compile-time option,
	       then SIGHUP will also cause the server to check the serial number
 on all secondary zones; normally, the serial numbers are
	       only checked at the SOA-specified intervals.

     SIGINT    Dumps the current data base and cache to
	       ``/var/tmp/named_dump.db'' or the value of _PATH_DUMPFILE.

     SIGILL    Dumps statistics data into named.stats if the server is compiled
 with -DSTATS.  Statistics data is appended to the file.

     SIGSYS    Dumps the profiling data in /var/tmp if the server is compiled
	       with profiling (server forks, chdirs and exits).

     SIGTERM   Saves any modified dynamic zones to the file system, and shuts
	       down the server.

     SIGUSR1   Turns on debugging; each SIGUSR1 increments debug level.
	       (SIGEMT on older systems without SIGUSR1.)

     SIGUSR2   Turns off debugging completely.	(SIGFPE on older systems
	       without SIGUSR2.)

     SIGWINCH  Toggles logging of all incoming queries via syslog(3) (requires
	       server to have been built with the QRYLOG option).

FILES    [Toc]    [Back]

     /etc/namedb/named.conf			 default name server configuration
     /var/run/named.pid (_PATH_PIDFILE) 	 the process id
     /var/tmp/named_dump.db (_PATH_DUMPFILE)	 dump of the name server database

     /var/tmp/named.run (file: _PATH_DEBUG)	 debug output
     /var/tmp/named.stats (file: _PATH_STATS)	 nameserver statistics data

SEE ALSO    [Toc]    [Back]

     named.conf(5), gethostbyname(3), hostname(7), kill(1), resolver(3),
     resolver(5), signal(3), RFC 882, RFC 883, RFC 973, RFC 974, RFC 1033, RFC
     1034, RFC 1035, RFC 1123, RFC 2308 ``Name Server Operations Guide for

4th Berkeley Distribution      February 1, 1996      4th Berkeley Distribution
[ Back ]
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