86 lines
2.4 KiB
Groff
86 lines
2.4 KiB
Groff
.TH "unbound" "8" "Jun 17, 2019" "NLnet Labs" "unbound 1.9.2"
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.\"
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.\" unbound.8 -- unbound manual
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.\"
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.\" Copyright (c) 2007, NLnet Labs. All rights reserved.
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.\"
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.\" See LICENSE for the license.
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.\"
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.\"
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.SH "NAME"
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.B unbound
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\- Unbound DNS validating resolver 1.9.2.
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.SH "SYNOPSIS"
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.B unbound
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.RB [ \-h ]
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.RB [ \-d ]
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.RB [ \-p ]
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.RB [ \-v ]
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.RB [ \-c
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.IR cfgfile ]
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.SH "DESCRIPTION"
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.B Unbound
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is a caching DNS resolver.
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.P
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It uses a built in list of authoritative nameservers for the root zone (.),
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the so called root hints.
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On receiving a DNS query it will ask the root nameservers for
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an answer and will in almost all cases receive a delegation to a top level
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domain (TLD) authoritative nameserver.
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It will then ask that nameserver for an answer.
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It will recursively continue until an answer is found or no answer is
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available (NXDOMAIN).
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For performance and efficiency reasons that answer is cached for a
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certain time (the answer's time\-to\-live or TTL).
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A second query for the same name will then be answered from the cache.
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Unbound can also do DNSSEC validation.
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.P
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To use a locally running
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.B Unbound
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for resolving put
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.sp
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.RS 6n
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nameserver 127.0.0.1
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.RE
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.sp
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into
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.IR resolv.conf (5).
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.P
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If authoritative DNS is needed as well using
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.IR nsd (8),
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careful setup is required because authoritative nameservers and
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resolvers are using the same port number (53).
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.P
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The available options are:
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.TP
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.B \-h
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Show the version and commandline option help.
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.TP
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.B \-c\fI cfgfile
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Set the config file with settings for unbound to read instead of reading the
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file at the default location, @ub_conf_file@. The syntax is
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described in \fIunbound.conf\fR(5).
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.TP
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.B \-d
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Debug flag: do not fork into the background, but stay attached to
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the console. This flag will also delay writing to the log file until
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the thread\-spawn time, so that most config and setup errors appear on
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stderr. If given twice or more, logging does not switch to the log file
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or to syslog, but the log messages are printed to stderr all the time.
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.TP
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.B \-p
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Don't use a pidfile. This argument should only be used by supervision
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systems which can ensure that only one instance of unbound will run
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concurrently.
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.TP
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.B \-v
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Increase verbosity. If given multiple times, more information is logged.
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This is in addition to the verbosity (if any) from the config file.
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.SH "SEE ALSO"
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\fIunbound.conf\fR(5),
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\fIunbound\-checkconf\fR(8),
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\fInsd\fR(8).
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.SH "AUTHORS"
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.B Unbound
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developers are mentioned in the CREDITS file in the distribution.
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