NSD(8)								    NSD 3.2.12								    NSD(8)

NAME

       nsd - Name Server Daemon (NSD) version 3.2.12.

SYNOPSIS

       nsd  [-4]  [-6]	[-a  ip-address[@port]] [-c configfile] [-d] [-f database] [-h] [-i identity] [-I nsid] [-l logfile] [-N server-count] [-n
       noncurrent-tcp-count] [-P pidfile] [-p port] [-s seconds] [-t chrootdir] [-u username] [-V level] [-v]

DESCRIPTION

       NSD is a complete implementation of an authoritative DNS nameserver.  Upon startup, NSD will read the database specified with  -f  database
       argument and put itself into background and answers queries on port 53 or a different port specified with -p port option. The database must
       be generated beforehand with zonec(8). By default, NSD will bind to all local interfaces available. Use the -a ip-address[@port] option	to
       specify a single particular interface address to be bound. If this option is given more than once, NSD will bind its UDP and TCP sockets to
       all the specified ip-addresses separately. If IPv6 is enabled when NSD is compiled an IPv6 address can also be specified.

OPTIONS

       All the options can be specified in the configfile ( -c argument), except for the -v and -h options. If options are specified on  the  com-
       mandline, the options on the commandline take precedence over the options in the configfile.

       Normally  NSD  should be started with the `nsdc(8) start` command invoked from a /etc/rc.d/nsd.sh script or similar at the operating system
       startup.

       -4     Only listen to IPv4 connections.

       -6     Only listen to IPv6 connections.

       -a ip-address[@port]
	      Listen to the specified ip-address.  The ip-address must be specified in numeric format (using the standard IPv4 or IPv6	notation).
	      Optionally,  a port number can be given.	This flag can be specified multiple times to listen to multiple IP addresses. If this flag
	      is not specified, NSD listens to the wildcard interface.

       -c configfile
	      Read specified configfile instead of the default /etc/nsd3/nsd.conf.  For format description see nsd.conf(5).

       -d     Turn on debugging mode, do not fork, stay in the foreground.

       -f database
	      Use the specified database instead of the default of /var/lib/nsd3/nsd.db.  If a zonesdir: is specified in the config file this path
	      can be relative to that directory.

       -h     Print help information and exit.

       -i identity
	      Return  the  specified  identity	when  asked  for  CH TXT ID.SERVER (This option is used to determine which server is answering the
	      queries when they are multicast). The default is the name returned by gethostname(3).

       -I nsid
	      Add the specified nsid to the EDNS section of the answer when queried with an NSID EDNS enabled packet.

       -l logfile
	      Log messages to the specified logfile.  The default is to log to stderr and syslog. If a zonesdir: is specified in the  config  file
	      this path can be relative to that directory.

       -N count
	      Start  count  NSD servers. The default is 1. Starting more than a single server is only useful on machines with multiple CPUs and/or
	      network adapters.

       -n number
	      The maximum number of concurrent TCP connection that can be handled by each server. The default is 10.

       -P pidfile
	      Use the specified pidfile instead of the platform specific default, which is mostly /var/run/nsd3/nsd.pid.  If a zonesdir: is speci-
	      fied in the config file, this path can be relative to that directory.

       -p port
	      Answer the queries on the specified port.  Normally this is port 53.

       -s seconds
	      Produce statistics dump every seconds seconds. This is equal to sending SIGUSR1 to the daemon periodically.

       -t chroot
	      Specifies  a  directory  to  chroot  to  upon  startup.  This option requires you to ensure that appropriate syslogd(8) socket (e.g.
	      chrootdir /dev/log) is available, otherwise NSD won't produce any log output.

       -u username
	      Drop user and group privileges to those of username after binding the socket.  The username must be one of: username, id, or id.gid.
	      For example: nsd, 80, or 80.80.

       -V level
	      This value specifies the verbosity level for (non-debug) logging.  Default is 0.

       -v     Print the version number of NSD to standard error and exit.

       NSD reacts to the following signals:

       SIGTERM
	      Stop answering queries, shutdown, and exit normally.

       SIGHUP Reload the database.

       SIGUSR1
	      Dump BIND8-style statistics into the log. Ignored otherwise.

FILES

       /var/lib/nsd3/nsd.db
	      default NSD database

       /var/run/nsd3/nsd.pid
	      the process id of the name server.

       /etc/nsd3/nsd.conf
	      default NSD configuration file

DIAGNOSTICS

       will log all the problems via the standard syslog(8) daemon facility, unless the -d option is specified.

SEE ALSO

       nsdc(8), nsd.conf(5), nsd-checkconf(8), nsd-notify(8), nsd-patch(8), nsd-xfer(8), zonec(8)

AUTHORS

       NSD was written by NLnet Labs and RIPE NCC joint team. Please see CREDITS file in the distribution for further details.

BUGS

       NSD will answer the queries erroneously if the database was not properly compiled with zonec(8). Therefore problems with misconfigured mas-
       ter zone files or zonec(8) bugs may not be visible until the queries are actually answered with NSD.

NLnet Labs							   jul 19, 2012 							    NSD(8)