1unbound(8)                       unbound 1.6.6                      unbound(8)
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NAME

6       unbound - Unbound DNS validating resolver 1.6.6.
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SYNOPSIS

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

12       Unbound is a caching DNS resolver.
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14       It  uses a built in list of authoritative nameservers for the root zone
15       (.), the so called root hints.  On receiving a DNS query  it  will  ask
16       the root nameservers for an answer and will in almost all cases receive
17       a delegation to a top level domain (TLD) authoritative nameserver.   It
18       will  then ask that nameserver for an answer.  It will recursively con‐
19       tinue until an answer is found or no answer  is  available  (NXDOMAIN).
20       For performance and efficiency reasons that answer is cached for a cer‐
21       tain time (the answer's time-to-live or TTL).  A second query  for  the
22       same  name  will  then be answered from the cache.  Unbound can also do
23       DNSSEC validation.
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25       To use a locally running Unbound for resolving put
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27             nameserver 127.0.0.1
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29       into resolv.conf(5).
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31       If authoritative DNS is needed as well using nsd(8), careful  setup  is
32       required  because authoritative nameservers and resolvers are using the
33       same port number (53).
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35       The available options are:
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37       -h     Show the version and commandline option help.
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39       -c cfgfile
40              Set the config file with settings for unbound to read instead of
41              reading     the     file     at     the     default    location,
42              /etc/unbound/unbound.conf.   The   syntax   is   described    in
43              unbound.conf(5).
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45       -d     Debug  flag:  do not fork into the background, but stay attached
46              to the console.  This flag will also delay writing  to  the  log
47              file  until the thread-spawn time, so that most config and setup
48              errors appear on stderr. If given twice or  more,  logging  does
49              not  switch  to  the log file or to syslog, but the log messages
50              are printed to stderr all the time.
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52       -p     Don't use a pidfile.  This  argument  should  only  be  used  by
53              supervision  systems  which can ensure that only one instance of
54              unbound will run concurrently.
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56       -v     Increase verbosity. If given multiple times, more information is
57              logged.   This is in addition to the verbosity (if any) from the
58              config file.
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SEE ALSO

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

64       Unbound developers are mentioned in the CREDITS file in  the  distribu‐
65       tion.
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69NLnet Labs                       Sep 18, 2017                       unbound(8)
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