Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
unbound(8)			unbound	1.17.0			    unbound(8)

       unbound - Unbound DNS validating	resolver 1.17.0.

       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 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/un-
	      bound/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 su-
	      pervision	systems	which can ensure that only one instance	of Un-
	      bound will run concurrently.

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

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

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

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

NLnet Labs			 Oct 13, 2022			    unbound(8)


Want to link to this manual page? Use this URL:

home | help