unbound(8)                       unbound 1.9.1                      unbound(8)

       unbound - Unbound DNS validating resolver 1.9.1.

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

       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 con-
       tinue until an answer is found or no answer  is  available  (NXDOMAIN).
       For performance and efficiency reasons that answer is cached for a cer-
       tain 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


       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 and commandline option help.

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

       -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
              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.

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

       Unbound developers are mentioned in the CREDITS file in  the  distribu-

NLnet Labs                       Mar 12, 2019                       unbound(8)

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