639 lines
24 KiB
Groff
639 lines
24 KiB
Groff
.TH "unbound-control" "8" "Jun 11, 2018" "NLnet Labs" "unbound 1.7.2"
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.\"
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.\" unbound-control.8 -- unbound remote control manual
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.\"
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.\" Copyright (c) 2008, 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\-control,
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.B unbound\-control\-setup
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\- Unbound remote server control utility.
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.SH "SYNOPSIS"
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.B unbound\-control
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.RB [ \-hq ]
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.RB [ \-c
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.IR cfgfile ]
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.RB [ \-s
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.IR server ]
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.IR command
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.SH "DESCRIPTION"
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.B Unbound\-control
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performs remote administration on the \fIunbound\fR(8) DNS server.
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It reads the configuration file, contacts the unbound server over SSL
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sends the command and displays the result.
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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 \fIcfgfile
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The config file to read with settings. If not given the default
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config file /var/unbound/unbound.conf is used.
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.TP
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.B \-s \fIserver[@port]
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IPv4 or IPv6 address of the server to contact. If not given, the
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address is read from the config file.
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.TP
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.B \-q
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quiet, if the option is given it does not print anything if it works ok.
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.SH "COMMANDS"
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There are several commands that the server understands.
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.TP
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.B start
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Start the server. Simply execs \fIunbound\fR(8). The unbound executable
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is searched for in the \fBPATH\fR set in the environment. It is started
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with the config file specified using \fI\-c\fR or the default config file.
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.TP
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.B stop
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Stop the server. The server daemon exits.
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.TP
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.B reload
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Reload the server. This flushes the cache and reads the config file fresh.
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.TP
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.B verbosity \fInumber
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Change verbosity value for logging. Same values as \fBverbosity\fR keyword in
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\fIunbound.conf\fR(5). This new setting lasts until the server is issued
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a reload (taken from config file again), or the next verbosity control command.
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.TP
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.B log_reopen
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Reopen the logfile, close and open it. Useful for logrotation to make the
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daemon release the file it is logging to. If you are using syslog it will
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attempt to close and open the syslog (which may not work if chrooted).
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.TP
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.B stats
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Print statistics. Resets the internal counters to zero, this can be
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controlled using the \fBstatistics\-cumulative\fR config statement.
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Statistics are printed with one [name]: [value] per line.
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.TP
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.B stats_noreset
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Peek at statistics. Prints them like the \fBstats\fR command does, but does not
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reset the internal counters to zero.
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.TP
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.B status
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Display server status. Exit code 3 if not running (the connection to the
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port is refused), 1 on error, 0 if running.
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.TP
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.B local_zone \fIname\fR \fItype
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Add new local zone with name and type. Like \fBlocal\-zone\fR config statement.
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If the zone already exists, the type is changed to the given argument.
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.TP
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.B local_zone_remove \fIname
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Remove the local zone with the given name. Removes all local data inside
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it. If the zone does not exist, the command succeeds.
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.TP
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.B local_data \fIRR data...
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Add new local data, the given resource record. Like \fBlocal\-data\fR
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config statement, except for when no covering zone exists. In that case
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this remote control command creates a transparent zone with the same
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name as this record. This command is not good at returning detailed syntax
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errors.
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.TP
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.B local_data_remove \fIname
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Remove all RR data from local name. If the name already has no items,
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nothing happens. Often results in NXDOMAIN for the name (in a static zone),
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but if the name has become an empty nonterminal (there is still data in
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domain names below the removed name), NOERROR nodata answers are the
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result for that name.
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.TP
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.B local_zones
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Add local zones read from stdin of unbound\-control. Input is read per line,
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with name space type on a line. For bulk additions.
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.TP
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.B local_zones_remove
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Remove local zones read from stdin of unbound\-control. Input is one name per
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line. For bulk removals.
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.TP
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.B local_datas
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Add local data RRs read from stdin of unbound\-control. Input is one RR per
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line. For bulk additions.
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.TP
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.B local_datas_remove
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Remove local data RRs read from stdin of unbound\-control. Input is one name per
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line. For bulk removals.
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.TP
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.B dump_cache
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The contents of the cache is printed in a text format to stdout. You can
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redirect it to a file to store the cache in a file.
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.TP
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.B load_cache
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The contents of the cache is loaded from stdin. Uses the same format as
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dump_cache uses. Loading the cache with old, or wrong data can result
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in old or wrong data returned to clients. Loading data into the cache
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in this way is supported in order to aid with debugging.
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.TP
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.B lookup \fIname
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Print to stdout the name servers that would be used to look up the
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name specified.
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.TP
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.B flush \fIname
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Remove the name from the cache. Removes the types
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A, AAAA, NS, SOA, CNAME, DNAME, MX, PTR, SRV and NAPTR.
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Because that is fast to do. Other record types can be removed using
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.B flush_type
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or
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.B flush_zone\fR.
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.TP
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.B flush_type \fIname\fR \fItype
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Remove the name, type information from the cache.
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.TP
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.B flush_zone \fIname
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Remove all information at or below the name from the cache.
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The rrsets and key entries are removed so that new lookups will be performed.
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This needs to walk and inspect the entire cache, and is a slow operation.
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The entries are set to expired in the implementation of this command (so,
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with serve\-expired enabled, it'll serve that information but schedule a
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prefetch for new information).
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.TP
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.B flush_bogus
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Remove all bogus data from the cache.
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.TP
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.B flush_negative
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Remove all negative data from the cache. This is nxdomain answers,
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nodata answers and servfail answers. Also removes bad key entries
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(which could be due to failed lookups) from the dnssec key cache, and
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iterator last-resort lookup failures from the rrset cache.
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.TP
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.B flush_stats
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Reset statistics to zero.
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.TP
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.B flush_requestlist
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Drop the queries that are worked on. Stops working on the queries that the
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server is working on now. The cache is unaffected. No reply is sent for
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those queries, probably making those users request again later.
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Useful to make the server restart working on queries with new settings,
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such as a higher verbosity level.
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.TP
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.B dump_requestlist
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Show what is worked on. Prints all queries that the server is currently
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working on. Prints the time that users have been waiting. For internal
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requests, no time is printed. And then prints out the module status.
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This prints the queries from the first thread, and not queries that are
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being serviced from other threads.
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.TP
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.B flush_infra \fIall|IP
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If all then entire infra cache is emptied. If a specific IP address, the
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entry for that address is removed from the cache. It contains EDNS, ping
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and lameness data.
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.TP
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.B dump_infra
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Show the contents of the infra cache.
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.TP
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.B set_option \fIopt: val
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Set the option to the given value without a reload. The cache is
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therefore not flushed. The option must end with a ':' and whitespace
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must be between the option and the value. Some values may not have an
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effect if set this way, the new values are not written to the config file,
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not all options are supported. This is different from the set_option call
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in libunbound, where all values work because unbound has not been initialized.
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.IP
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The values that work are: statistics\-interval, statistics\-cumulative,
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do\-not\-query\-localhost, harden\-short\-bufsize, harden\-large\-queries,
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harden\-glue, harden\-dnssec\-stripped, harden\-below\-nxdomain,
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harden\-referral\-path, prefetch, prefetch\-key, log\-queries,
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hide\-identity, hide\-version, identity, version, val\-log\-level,
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val\-log\-squelch, ignore\-cd\-flag, add\-holddown, del\-holddown,
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keep\-missing, tcp\-upstream, ssl\-upstream, max\-udp\-size, ratelimit,
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ip\-ratelimit, cache\-max\-ttl, cache\-min\-ttl, cache\-max\-negative\-ttl.
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.TP
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.B get_option \fIopt
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Get the value of the option. Give the option name without a trailing ':'.
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The value is printed. If the value is "", nothing is printed
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and the connection closes. On error 'error ...' is printed (it gives
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a syntax error on unknown option). For some options a list of values,
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one on each line, is printed. The options are shown from the config file
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as modified with set_option. For some options an override may have been
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taken that does not show up with this command, not results from e.g. the
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verbosity and forward control commands. Not all options work, see list_stubs,
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list_forwards, list_local_zones and list_local_data for those.
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.TP
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.B list_stubs
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List the stub zones in use. These are printed one by one to the output.
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This includes the root hints in use.
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.TP
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.B list_forwards
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List the forward zones in use. These are printed zone by zone to the output.
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.TP
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.B list_insecure
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List the zones with domain\-insecure.
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.TP
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.B list_local_zones
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List the local zones in use. These are printed one per line with zone type.
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.TP
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.B list_local_data
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List the local data RRs in use. The resource records are printed.
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.TP
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.B insecure_add \fIzone
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Add a \fBdomain\-insecure\fR for the given zone, like the statement in unbound.conf.
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Adds to the running unbound without affecting the cache contents (which may
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still be bogus, use \fBflush_zone\fR to remove it), does not affect the config file.
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.TP
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.B insecure_remove \fIzone
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Removes domain\-insecure for the given zone.
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.TP
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.B forward_add \fR[\fI+i\fR] \fIzone addr ...
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Add a new forward zone to running unbound. With +i option also adds a
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\fIdomain\-insecure\fR for the zone (so it can resolve insecurely if you have
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a DNSSEC root trust anchor configured for other names).
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The addr can be IP4, IP6 or nameserver names, like \fIforward-zone\fR config
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in unbound.conf.
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.TP
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.B forward_remove \fR[\fI+i\fR] \fIzone
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Remove a forward zone from running unbound. The +i also removes a
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\fIdomain\-insecure\fR for the zone.
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.TP
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.B stub_add \fR[\fI+ip\fR] \fIzone addr ...
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Add a new stub zone to running unbound. With +i option also adds a
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\fIdomain\-insecure\fR for the zone. With +p the stub zone is set to prime,
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without it it is set to notprime. The addr can be IP4, IP6 or nameserver
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names, like the \fIstub-zone\fR config in unbound.conf.
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.TP
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.B stub_remove \fR[\fI+i\fR] \fIzone
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Remove a stub zone from running unbound. The +i also removes a
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\fIdomain\-insecure\fR for the zone.
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.TP
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.B forward \fR[\fIoff\fR | \fIaddr ...\fR ]
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Setup forwarding mode. Configures if the server should ask other upstream
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nameservers, should go to the internet root nameservers itself, or show
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the current config. You could pass the nameservers after a DHCP update.
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.IP
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Without arguments the current list of addresses used to forward all queries
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to is printed. On startup this is from the forward\-zone "." configuration.
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Afterwards it shows the status. It prints off when no forwarding is used.
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.IP
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If \fIoff\fR is passed, forwarding is disabled and the root nameservers
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are used. This can be used to avoid to avoid buggy or non\-DNSSEC supporting
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nameservers returned from DHCP. But may not work in hotels or hotspots.
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.IP
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If one or more IPv4 or IPv6 addresses are given, those are then used to forward
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queries to. The addresses must be separated with spaces. With '@port' the
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port number can be set explicitly (default port is 53 (DNS)).
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.IP
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By default the forwarder information from the config file for the root "." is
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used. The config file is not changed, so after a reload these changes are
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gone. Other forward zones from the config file are not affected by this command.
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.TP
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.B ratelimit_list \fR[\fI+a\fR]
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List the domains that are ratelimited. Printed one per line with current
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estimated qps and qps limit from config. With +a it prints all domains, not
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just the ratelimited domains, with their estimated qps. The ratelimited
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domains return an error for uncached (new) queries, but cached queries work
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as normal.
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.TP
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.B ip_ratelimit_list \fR[\fI+a\fR]
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List the ip addresses that are ratelimited. Printed one per line with current
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estimated qps and qps limit from config. With +a it prints all ips, not
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just the ratelimited ips, with their estimated qps. The ratelimited
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ips are dropped before checking the cache.
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.TP
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.B list_auth_zones
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List the auth zones that are configured. Printed one per line with a
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status, indicating if the zone is expired and current serial number.
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.TP
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.B view_list_local_zones \fIview\fR
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\fIlist_local_zones\fR for given view.
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.TP
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.B view_local_zone \fIview\fR \fIname\fR \fItype
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\fIlocal_zone\fR for given view.
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.TP
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.B view_local_zone_remove \fIview\fR \fIname
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\fIlocal_zone_remove\fR for given view.
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.TP
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.B view_list_local_data \fIview\fR
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\fIlist_local_data\fR for given view.
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.TP
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.B view_local_data \fIview\fR \fIRR data...
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\fIlocal_data\fR for given view.
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.TP
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.B view_local_data_remove \fIview\fR \fIname
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\fIlocal_data_remove\fR for given view.
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.SH "EXIT CODE"
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The unbound\-control program exits with status code 1 on error, 0 on success.
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.SH "SET UP"
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The setup requires a self\-signed certificate and private keys for both
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the server and client. The script \fIunbound\-control\-setup\fR generates
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these in the default run directory, or with \-d in another directory.
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If you change the access control permissions on the key files you can decide
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who can use unbound\-control, by default owner and group but not all users.
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Run the script under the same username as you have configured in unbound.conf
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or as root, so that the daemon is permitted to read the files, for example with:
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.nf
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sudo \-u unbound unbound\-control\-setup
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.fi
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If you have not configured
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a username in unbound.conf, the keys need read permission for the user
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credentials under which the daemon is started.
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The script preserves private keys present in the directory.
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After running the script as root, turn on \fBcontrol\-enable\fR in
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\fIunbound.conf\fR.
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.SH "STATISTIC COUNTERS"
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The \fIstats\fR command shows a number of statistic counters.
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.TP
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.I threadX.num.queries
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number of queries received by thread
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.TP
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.I threadX.num.queries_ip_ratelimited
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number of queries rate limited by thread
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.TP
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.I threadX.num.cachehits
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number of queries that were successfully answered using a cache lookup
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.TP
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.I threadX.num.cachemiss
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number of queries that needed recursive processing
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.TP
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.I threadX.num.dnscrypt.crypted
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number of queries that were encrypted and successfully decapsulated by dnscrypt.
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.TP
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.I threadX.num.dnscrypt.cert
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number of queries that were requesting dnscrypt certificates.
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.TP
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.I threadX.num.dnscrypt.cleartext
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number of queries received on dnscrypt port that were cleartext and not a
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request for certificates.
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.TP
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.I threadX.num.dnscrypt.malformed
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number of request that were neither cleartext, not valid dnscrypt messages.
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.TP
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.I threadX.num.prefetch
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number of cache prefetches performed. This number is included in
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cachehits, as the original query had the unprefetched answer from cache,
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and resulted in recursive processing, taking a slot in the requestlist.
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Not part of the recursivereplies (or the histogram thereof) or cachemiss,
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as a cache response was sent.
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.TP
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.I threadX.num.zero_ttl
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number of replies with ttl zero, because they served an expired cache entry.
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.TP
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.I threadX.num.recursivereplies
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The number of replies sent to queries that needed recursive processing. Could be smaller than threadX.num.cachemiss if due to timeouts no replies were sent for some queries.
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.TP
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.I threadX.requestlist.avg
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The average number of requests in the internal recursive processing request list on insert of a new incoming recursive processing query.
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.TP
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.I threadX.requestlist.max
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Maximum size attained by the internal recursive processing request list.
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.TP
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.I threadX.requestlist.overwritten
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Number of requests in the request list that were overwritten by newer entries. This happens if there is a flood of queries that recursive processing and the server has a hard time.
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.TP
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.I threadX.requestlist.exceeded
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Queries that were dropped because the request list was full. This happens if a flood of queries need recursive processing, and the server can not keep up.
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.TP
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.I threadX.requestlist.current.all
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Current size of the request list, includes internally generated queries (such
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as priming queries and glue lookups).
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.TP
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.I threadX.requestlist.current.user
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Current size of the request list, only the requests from client queries.
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.TP
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.I threadX.recursion.time.avg
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Average time it took to answer queries that needed recursive processing. Note that queries that were answered from the cache are not in this average.
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.TP
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.I threadX.recursion.time.median
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The median of the time it took to answer queries that needed recursive
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processing. The median means that 50% of the user queries were answered in
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less than this time. Because of big outliers (usually queries to non
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responsive servers), the average can be bigger than the median. This median
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has been calculated by interpolation from a histogram.
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.TP
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.I threadX.tcpusage
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The currently held tcp buffers for incoming connections. A spot value on
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the time of the request. This helps you spot if the incoming\-num\-tcp
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buffers are full.
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.TP
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.I total.num.queries
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summed over threads.
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.TP
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.I total.num.cachehits
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summed over threads.
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.TP
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.I total.num.cachemiss
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summed over threads.
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.TP
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.I total.num.dnscrypt.crypted
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summed over threads.
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.TP
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.I total.num.dnscrypt.cert
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summed over threads.
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.TP
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.I total.num.dnscrypt.cleartext
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summed over threads.
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.TP
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.I total.num.dnscrypt.malformed
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summed over threads.
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.TP
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.I total.num.prefetch
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summed over threads.
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.TP
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.I total.num.zero_ttl
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summed over threads.
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.TP
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.I total.num.recursivereplies
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summed over threads.
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.TP
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.I total.requestlist.avg
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averaged over threads.
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.TP
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.I total.requestlist.max
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the maximum of the thread requestlist.max values.
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.TP
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.I total.requestlist.overwritten
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summed over threads.
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.TP
|
|
.I total.requestlist.exceeded
|
|
summed over threads.
|
|
.TP
|
|
.I total.requestlist.current.all
|
|
summed over threads.
|
|
.TP
|
|
.I total.recursion.time.median
|
|
averaged over threads.
|
|
.TP
|
|
.I total.tcpusage
|
|
summed over threads.
|
|
.TP
|
|
.I time.now
|
|
current time in seconds since 1970.
|
|
.TP
|
|
.I time.up
|
|
uptime since server boot in seconds.
|
|
.TP
|
|
.I time.elapsed
|
|
time since last statistics printout, in seconds.
|
|
.SH EXTENDED STATISTICS
|
|
.TP
|
|
.I mem.cache.rrset
|
|
Memory in bytes in use by the RRset cache.
|
|
.TP
|
|
.I mem.cache.message
|
|
Memory in bytes in use by the message cache.
|
|
.TP
|
|
.I mem.cache.dnscrypt_shared_secret
|
|
Memory in bytes in use by the dnscrypt shared secrets cache.
|
|
.TP
|
|
.I mem.cache.dnscrypt_nonce
|
|
Memory in bytes in use by the dnscrypt nonce cache.
|
|
.TP
|
|
.I mem.mod.iterator
|
|
Memory in bytes in use by the iterator module.
|
|
.TP
|
|
.I mem.mod.validator
|
|
Memory in bytes in use by the validator module. Includes the key cache and
|
|
negative cache.
|
|
.TP
|
|
.I histogram.<sec>.<usec>.to.<sec>.<usec>
|
|
Shows a histogram, summed over all threads. Every element counts the
|
|
recursive queries whose reply time fit between the lower and upper bound.
|
|
Times larger or equal to the lowerbound, and smaller than the upper bound.
|
|
There are 40 buckets, with bucket sizes doubling.
|
|
.TP
|
|
.I num.query.type.A
|
|
The total number of queries over all threads with query type A.
|
|
Printed for the other query types as well, but only for the types for which
|
|
queries were received, thus =0 entries are omitted for brevity.
|
|
.TP
|
|
.I num.query.type.other
|
|
Number of queries with query types 256\-65535.
|
|
.TP
|
|
.I num.query.class.IN
|
|
The total number of queries over all threads with query class IN (internet).
|
|
Also printed for other classes (such as CH (CHAOS) sometimes used for
|
|
debugging), or NONE, ANY, used by dynamic update.
|
|
num.query.class.other is printed for classes 256\-65535.
|
|
.TP
|
|
.I num.query.opcode.QUERY
|
|
The total number of queries over all threads with query opcode QUERY.
|
|
Also printed for other opcodes, UPDATE, ...
|
|
.TP
|
|
.I num.query.tcp
|
|
Number of queries that were made using TCP towards the unbound server.
|
|
.TP
|
|
.I num.query.tcpout
|
|
Number of queries that the unbound server made using TCP outgoing towards
|
|
other servers.
|
|
.TP
|
|
.I num.query.ipv6
|
|
Number of queries that were made using IPv6 towards the unbound server.
|
|
.TP
|
|
.I num.query.flags.RD
|
|
The number of queries that had the RD flag set in the header.
|
|
Also printed for flags QR, AA, TC, RA, Z, AD, CD.
|
|
Note that queries with flags QR, AA or TC may have been rejected
|
|
because of that.
|
|
.TP
|
|
.I num.query.edns.present
|
|
number of queries that had an EDNS OPT record present.
|
|
.TP
|
|
.I num.query.edns.DO
|
|
number of queries that had an EDNS OPT record with the DO (DNSSEC OK) bit set.
|
|
These queries are also included in the num.query.edns.present number.
|
|
.TP
|
|
.I num.query.ratelimited
|
|
The number of queries that are turned away from being send to nameserver due to
|
|
ratelimiting.
|
|
.TP
|
|
.I num.query.dnscrypt.shared_secret.cachemiss
|
|
The number of dnscrypt queries that did not find a shared secret in the cache.
|
|
The can be use to compute the shared secret hitrate.
|
|
.TP
|
|
.I num.query.dnscrypt.replay
|
|
The number of dnscrypt queries that found a nonce hit in the nonce cache and
|
|
hence are considered a query replay.
|
|
.TP
|
|
.I num.answer.rcode.NXDOMAIN
|
|
The number of answers to queries, from cache or from recursion, that had the
|
|
return code NXDOMAIN. Also printed for the other return codes.
|
|
.TP
|
|
.I num.answer.rcode.nodata
|
|
The number of answers to queries that had the pseudo return code nodata.
|
|
This means the actual return code was NOERROR, but additionally, no data was
|
|
carried in the answer (making what is called a NOERROR/NODATA answer).
|
|
These queries are also included in the num.answer.rcode.NOERROR number.
|
|
Common for AAAA lookups when an A record exists, and no AAAA.
|
|
.TP
|
|
.I num.answer.secure
|
|
Number of answers that were secure. The answer validated correctly.
|
|
The AD bit might have been set in some of these answers, where the client
|
|
signalled (with DO or AD bit in the query) that they were ready to accept
|
|
the AD bit in the answer.
|
|
.TP
|
|
.I num.answer.bogus
|
|
Number of answers that were bogus. These answers resulted in SERVFAIL
|
|
to the client because the answer failed validation.
|
|
.TP
|
|
.I num.rrset.bogus
|
|
The number of rrsets marked bogus by the validator. Increased for every
|
|
RRset inspection that fails.
|
|
.TP
|
|
.I unwanted.queries
|
|
Number of queries that were refused or dropped because they failed the
|
|
access control settings.
|
|
.TP
|
|
.I unwanted.replies
|
|
Replies that were unwanted or unsolicited. Could have been random traffic,
|
|
delayed duplicates, very late answers, or could be spoofing attempts.
|
|
Some low level of late answers and delayed duplicates are to be expected
|
|
with the UDP protocol. Very high values could indicate a threat (spoofing).
|
|
.TP
|
|
.I msg.cache.count
|
|
The number of items (DNS replies) in the message cache.
|
|
.TP
|
|
.I rrset.cache.count
|
|
The number of RRsets in the rrset cache. This includes rrsets used by
|
|
the messages in the message cache, but also delegation information.
|
|
.TP
|
|
.I infra.cache.count
|
|
The number of items in the infra cache. These are IP addresses with their
|
|
timing and protocol support information.
|
|
.TP
|
|
.I key.cache.count
|
|
The number of items in the key cache. These are DNSSEC keys, one item
|
|
per delegation point, and their validation status.
|
|
.TP
|
|
.I dnscrypt_shared_secret.cache.count
|
|
The number of items in the shared secret cache. These are precomputed shared
|
|
secrets for a given client public key/server secret key pair. Shared secrets
|
|
are CPU intensive and this cache allows unbound to avoid recomputing the
|
|
shared secret when multiple dnscrypt queries are sent from the same client.
|
|
.TP
|
|
.I dnscrypt_nonce.cache.count
|
|
The number of items in the client nonce cache. This cache is used to prevent
|
|
dnscrypt queries replay. The client nonce must be unique for each client public
|
|
key/server secret key pair. This cache should be able to host QPS * `replay
|
|
window` interval keys to prevent replay of a query during `replay window`
|
|
seconds.
|
|
.TP
|
|
.I num.query.authzone.up
|
|
The number of queries answered from auth\-zone data, upstream queries.
|
|
These queries would otherwise have been sent (with fallback enabled) to
|
|
the internet, but are now answered from the auth zone.
|
|
.TP
|
|
.I num.query.authzone.down
|
|
The number of queries for downstream answered from auth\-zone data.
|
|
These queries are from downstream clients, and have had an answer from
|
|
the data in the auth zone.
|
|
.TP
|
|
.I num.query.aggressive.NOERROR
|
|
The number of queries answered using cached NSEC records with NODATA RCODE.
|
|
These queries would otherwise have been sent to the internet, but are now
|
|
answered using cached data.
|
|
.TP
|
|
.I num.query.aggressive.NXDOMAIN
|
|
The number of queries answered using cached NSEC records with NXDOMAIN RCODE.
|
|
These queries would otherwise have been sent to the internet, but are now
|
|
answered using cached data.
|
|
.SH "FILES"
|
|
.TP
|
|
.I /var/unbound/unbound.conf
|
|
unbound configuration file.
|
|
.TP
|
|
.I /var/unbound
|
|
directory with private keys (unbound_server.key and unbound_control.key) and
|
|
self\-signed certificates (unbound_server.pem and unbound_control.pem).
|
|
.SH "SEE ALSO"
|
|
\fIunbound.conf\fR(5),
|
|
\fIunbound\fR(8).
|