 |
Charles Steinkuehler's LEAF/LRP Website |
|
named.8SYNOPSIS
NAMED [-d debuglevel] [-p port#] [-(b|c) config_file] [-f -q -r -v] [-u
user_name] [-g group_name] [-t directory] [-w directory]
[config_file]
DESCRIPTION
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 ar
guments, named will read the default configuration file /etc/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 speci
fied 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 de
termines the level of messages printed. If negative,
debuglevel is set to ``1''.
NOTE: The new debugging framework is considerably more so
phisticated than it was in older versions of NAMED. The con
figuration file's ``logging'' statement allows for multiple,
distinct levels of debugging for each of a large set of cate
gories 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 get
servbyname(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 equiva
lent 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/named.conf.
-f Run this process in the foreground; don't fork(2) and daemo
nize. (The default is to daemonize.)
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 initial
izes. The value specified may be either a username or a nu
meric 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 ini
tializes. 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 finshed 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 de
fault 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 argu
ment overrides any config_file specified by the use of the ``-b'' or
``-c'' flags. If no further argument is given, then the default configu
ration file is used (/etc/named.conf).
Master File Format
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>
where:
domain is ``.'' for root, ``@'' for the current origin, or a stan
dard 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
opt_class The object address type; currently only one type is sup
ported, 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 parenthe
ses:
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
preferences.
CNAME the canonical name for an alias (domain)
SOA marks the start of a zone of authority
(domain of originating host, domain ad
dress of maintainer, a serial number and
the following parameters in seconds: re
fresh, 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 in
troduced 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
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
will be done to load the new data. If a master server cannot be contact
ed 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
The boot file directives ``domain'' and ``suffixes'' have been obsoleted
by a more useful, resolver-based implementation of suffixing for partial
ly-qualified domain names. The prior mechanisms could fail under a num
ber 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 num
ber 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 com
piled 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.
(SIGEMTon older systems without SIGUSR1.)
SIGUSR2 Turns off debugging completely. (SIGFPEon older systems
without SIGUSR2.)
SIGWINCH Toggles logging of all incoming queries via syslog(8) (requires
server to have been built with the QRYLOG option).
FILES
/etc/named.conf default name server configu
ration file
/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 ALSOMan(1) output converted with man2html |