DragonFly On-Line Manual Pages

NSD(8)                             NSD 4.1.7                            NSD(8)

NAME
       nsd - Name Server Daemon (NSD) version 4.1.7.

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 is
       created if it does not exist. 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
       commandline, the options on the commandline take precedence over the
       options in the configfile.

       Normally NSD should be started with the `nsd-control(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
              /usr/local/etc/nsd/nsd.conf.  For format description see
              nsd.conf(5).

       -d     Do not fork, stay in the foreground.

       -f database
              Use the specified database instead of the default of
              /var/db/nsd/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 anycast). 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.  As a sequence of hex
              characters or with ascii_ prefix and then an ascii string.

       -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 100.

       -P pidfile
              Use the specified pidfile instead of the platform specific
              default, which is mostly /var/run/nsd/nsd.pid.  If a zonesdir:
              is specified 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.  Scans zone files and if changed (mtime) reads them in.
              Also reopens the logfile (assists logrotation).

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

FILES
       /var/db/nsd/nsd.db
              default NSD database

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

       /usr/local/etc/nsd/nsd.conf
              default NSD configuration file

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

SEE ALSO
       nsd.conf(5), nsd-checkconf(8), nsd-control(8)

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

NLnet Labs                     December 10, 2015                        NSD(8)