unbound/doc/unbound-control.8.in

.TH "unbound-control" "8" "@date@" "NLnet Labs" "unbound @version@"
.\"
.\" unbound-control.8 -- unbound remote control manual
.\"
.\" Copyright (c) 2008, NLnet Labs. All rights reserved.
.\"
.\" See LICENSE for the license.
.\"
.\"
.SH "NAME"
.LP
unbound-control
\- Unbound remote server control utility.
.SH "SYNOPSIS"
.B unbound-control
.RB [ \-h ]
.RB [ \-c 
.IR cfgfile ]
.RB [ \-s 
.IR server ]
.IR command
.SH "DESCRIPTION"
.B Unbound-control
Performs remote administration on the \fIunbound\fR(8) DNS server.
It reads the configuration file, contacts the unbound server over SSL
sends the command and displays the result.
.P
The available options are:
.TP
.B \-h
Show the version and commandline option help.
.TP
.B \-c \fIcfgfile
The config file to read with settings.  If not given the default
config file @ub_conf_file@ is used.
.TP
.B \-s \fIserver[@port]
IPv4 or IPv6 address of the server to contact.  If not given, the
address is read from the config file.
.SH "COMMANDS"
There are several commands that the server understands.
.TP
.B start
Start the server. Simply execs \fIunbound\fR(8).  The unbound executable 
is searched for in the \fBPATH\fR set in the environment.  It is started 
with the config file specified using \fI\-c\fR or the default config file.
.TP
.B stop
Stop the server. The server daemon exits.
.TP
.B reload
Reload the server. This flushes the cache and reads the config file fresh.
.TP
.B verbosity \fInumber
Change verbosity value for logging. Same values as \fBverbosity\fR keyword in
\fIunbound.conf\fR(5).  This new setting lasts until the server is issued
a reload (taken from config file again), or the next verbosity control command.
.TP
.B stats
Print statistics. Resets the internal counters to zero, this can be 
controlled using the \fBstatistics\-cumulative\fR config statement. 
Statistics are printed with one [name]: [value] per line.
.TP
.B local_zone \fIname\fR \fItype
Add new local zone with name and type. Like \fBlocal\-zone\fR config statement.
If the zone already exists, the type is changed to the given argument.
.TP
.B local_zone_remove \fIname
Remove the local zone with the given name.  Removes all local data inside
it.  If the zone does not exist, the command succeeds.
.TP
.B local_data \fIRR data...
Add new local data, the given resource record. Like \fBlocal\-data\fR
config statement, except for when no covering zone exists.  In that case
this remote control command creates a transparent zone with the same 
name as this record.  This command is not good at returning detailed syntax 
errors.
.TP
.B local_data_remove \fIname
Remove all RR data from local name.  If the name already has no items,
nothing happens.  Often results in NXDOMAIN for the name (in a static zone),
but if the name has become an empty nonterminal (there is still data in 
domain names below the removed name), NOERROR nodata answers are the 
result for that name.
.TP
.B dump_cache
The contents of the cache is printed in a text format to stdout. You can
redirect it to a file to store the cache in a file.
.TP
.B load_cache
The contents of the cache is loaded from stdin.  Uses the same format as
dump_cache uses.  Loading the cache with old, or wrong data can result
in old or wrong data returned to clients.
.SH "EXIT CODE"
The unbound-control program exits with status code 1 on error, 0 on success.
.SH "SET UP"
The setup requires a self\-signed certificate and private keys for both 
the server and client.  The script \fIunbound\-control\-setup\fR generates
these in the default run directory, or with \-d in another directory.
The script preserves private keys present in the directory.
After running the script as root, turn on \fBcontrol-enable\fR in 
\fIunbound.conf\fR.
.SH "STATISTIC COUNTERS"
The \fIstats\fR command shows a number of statistic counters.
.TP
.I threadX.num.queries
number of queries received by thread
.TP
.I threadX.num.cachehits
number of queries that were successfully answered using a cache lookup
.TP
.I threadX.num.cachemiss
number of queries that needed recursive processing
.TP
.I threadX.num.recursivereplies
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.
.TP
.I threadX.requestlist.avg
The average number of requests in the internal recursive processing request list on insert of a new incoming recursive processing query.
.TP
.I threadX.requestlist.max
Maximum size attained by the internal recursive processing request list.
.TP
.I threadX.requestlist.overwritten
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.
.TP
.I threadX.requestlist.exceeded
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.
.TP
.I threadX.requestlist.current.all
Current size of the request list, includes internally generated queries (such
as priming queries and glue lookups).
.TP
.I threadX.requestlist.current.user
Current size of the request list, only the requests from client queries.
.TP
.I threadX.recursion.time.avg
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.
.TP
.I threadX.recursion.time.median
The median of the time it took to answer queries that needed recursive
processing.  The median means that 50% of the user queries were answered in 
less than this time.  Because of big outliers (usually queries to non 
responsive servers), the average can be bigger than the median.  This median
has been calculated by interpolation from a histogram.
.TP
.I total.num.queries
summed over threads.
.TP
.I total.num.cachehits
summed over threads.
.TP
.I total.num.cachemiss
summed over threads.
.TP
.I total.num.recursivereplies
summed over threads.
.TP
.I total.requestlist.avg
averaged over threads.
.TP
.I total.requestlist.max
the maximum of the thread requestlist.max values.
.TP
.I total.requestlist.overwritten
summed over threads.
.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 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.total.sbrk
If sbrk(2) is available, an estimate of the heap size of the program in number of bytes. Close to the total memory used by the program, as reported by top and ps.  Could be wrong if the OS allocates memory non\-contiguously.
.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.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.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.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).
.SH "FILES"
.TP
.I @ub_conf_file@
unbound configuration file.
.TP
.I @UNBOUND_RUN_DIR@
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).