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 unbound(8)                      NLnet Labs                       unbound(8)
 unbound 1.9.5                                                 unbound 1.9.5

                                Nov 19, 2019



 NAME
      unbound - Unbound DNS validating resolver 1.9.5.

 SYNOPSIS
      unbound [-h] [-d] [-p] [-v] [-c cfgfile]

 DESCRIPTION
      Unbound is a caching DNS resolver.

      It uses a built in list of authoritative nameservers for the root zone
      (.), the so called root hints.  On receiving a DNS query it will ask
      the root nameservers for an answer and will in almost all cases
      receive a delegation to a top level domain (TLD) authoritative
      nameserver.  It will then ask that nameserver for an answer.  It will
      recursively continue until an answer is found or no answer is
      available (NXDOMAIN).  For performance and efficiency reasons that
      answer is cached for a certain time (the answer's time-to-live or
      TTL).  A second query for the same name will then be answered from the
      cache.  Unbound can also do DNSSEC validation.

      To use a locally running Unbound for resolving put

            nameserver 127.0.0.1

      into resolv.conf(5).

      If authoritative DNS is needed as well using nsd(8), careful setup is
      required because authoritative nameservers and resolvers are using the
      same port number (53).

      The available options are:

      -h   Show the version number and commandline option help, and exit.

      -c cfgfile
           Set the config file with settings for unbound to read instead of
           reading the file at the default location,
           /usr/local/etc/unbound/unbound.conf. The syntax is described in
           unbound.conf(5).

      -d   Debug flag: do not fork into the background, but stay attached to
           the console.  This flag will also delay writing to the log file
           until the thread-spawn time, so that most config and setup errors
           appear on stderr. If given twice or more, logging does not switch
           to the log file or to syslog, but the log messages are printed to
           stderr all the time.

      -p   Don't use a pidfile.  This argument should only be used by
           supervision systems which can ensure that only one instance of



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 unbound(8)                      NLnet Labs                       unbound(8)
 unbound 1.9.5                                                 unbound 1.9.5

                                Nov 19, 2019



           unbound will run concurrently.

      -v   Increase verbosity. If given multiple times, more information is
           logged.  This is in addition to the verbosity (if any) from the
           config file.

      -V   Show the version number and build options, and exit.

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

 AUTHORS
      Unbound developers are mentioned in the CREDITS file in the
      distribution.






































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