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<div class="refentry" lang="en">
<div class="refnamediv">
<h2>Name</h2>
<p><span class="application">rndc</span> — name server control utility</p>
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="cmdsynopsis"><p><code class="command">rndc</code> [<code class="option">-b <em class="replaceable"><code>source-address</code></em></code>] [<code class="option">-c <em class="replaceable"><code>config-file</code></em></code>] [<code class="option">-k <em class="replaceable"><code>key-file</code></em></code>] [<code class="option">-s <em class="replaceable"><code>server</code></em></code>] [<code class="option">-p <em class="replaceable"><code>port</code></em></code>] [<code class="option">-V</code>] [<code class="option">-y <em class="replaceable"><code>key_id</code></em></code>] {command}</p></div>
</div>
<div class="refsect1" lang="en">
<a name="id2648891"></a><h2>DESCRIPTION</h2>
<p><span><strong class="command">rndc</strong></span>
controls the operation of a name
server. It supersedes the <span><strong class="command">ndc</strong></span> utility
that was provided in old BIND releases. If
<span><strong class="command">rndc</strong></span> is invoked with no command line
options or arguments, it prints a short summary of the
supported commands and the available options and their
arguments.
</p>
<p><span><strong class="command">rndc</strong></span>
communicates with the name server over a TCP connection, sending
commands authenticated with digital signatures. In the current
versions of
<span><strong class="command">rndc</strong></span> and <span><strong class="command">named</strong></span>,
the only supported authentication algorithms are HMAC-MD5
(for compatibility), HMAC-SHA1, HMAC-SHA224, HMAC-SHA256
(default), HMAC-SHA384 and HMAC-SHA512.
They use a shared secret on each end of the connection.
This provides TSIG-style authentication for the command
request and the name server's response. All commands sent
over the channel must be signed by a key_id known to the
server.
</p>
<p><span><strong class="command">rndc</strong></span>
reads a configuration file to
determine how to contact the name server and decide what
algorithm and key it should use.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2648941"></a><h2>OPTIONS</h2>
<div class="variablelist"><dl>
<dt><span class="term">-b <em class="replaceable"><code>source-address</code></em></span></dt>
<dd><p>
Use <em class="replaceable"><code>source-address</code></em>
as the source address for the connection to the server.
Multiple instances are permitted to allow setting of both
the IPv4 and IPv6 source addresses.
</p></dd>
<dt><span class="term">-c <em class="replaceable"><code>config-file</code></em></span></dt>
<dd><p>
Use <em class="replaceable"><code>config-file</code></em>
as the configuration file instead of the default,
</p></dd>
<dt><span class="term">-k <em class="replaceable"><code>key-file</code></em></span></dt>
<dd><p>
Use <em class="replaceable"><code>key-file</code></em>
as the key file instead of the default,
authenticate
commands sent to the server if the <em class="replaceable"><code>config-file</code></em>
does not exist.
</p></dd>
<dt><span class="term">-s <em class="replaceable"><code>server</code></em></span></dt>
<dd><p><em class="replaceable"><code>server</code></em> is
the name or address of the server which matches a
server statement in the configuration file for
<span><strong class="command">rndc</strong></span>. If no server is supplied on the
command line, the host named by the default-server clause
in the options statement of the <span><strong class="command">rndc</strong></span>
configuration file will be used.
</p></dd>
<dt><span class="term">-p <em class="replaceable"><code>port</code></em></span></dt>
<dd><p>
Send commands to TCP port
<em class="replaceable"><code>port</code></em>
instead
of BIND 9's default control channel port, 953.
</p></dd>
<dt><span class="term">-V</span></dt>
<dd><p>
Enable verbose logging.
</p></dd>
<dt><span class="term">-y <em class="replaceable"><code>key_id</code></em></span></dt>
<dd><p>
Use the key <em class="replaceable"><code>key_id</code></em>
from the configuration file.
<em class="replaceable"><code>key_id</code></em>
must be
known by named with the same algorithm and secret string
in order for control message validation to succeed.
If no <em class="replaceable"><code>key_id</code></em>
is specified, <span><strong class="command">rndc</strong></span> will first look
for a key clause in the server statement of the server
being used, or if no server statement is present for that
host, then the default-key clause of the options statement.
Note that the configuration file contains shared secrets
which are used to send authenticated control commands
to name servers. It should therefore not have general read
or write access.
</p></dd>
</dl></div>
</div>
<div class="refsect1" lang="en">
<a name="id2651130"></a><h2>COMMANDS</h2>
<p>
A list of commands supported by <span><strong class="command">rndc</strong></span> can
be seen by running <span><strong class="command">rndc</strong></span> without arguments.
</p>
<p>
Currently supported commands are:
</p>
<div class="variablelist"><dl>
<dt><span class="term"><strong class="userinput"><code>reload</code></strong></span></dt>
<dd><p>
Reload configuration file and zones.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>reload <em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</code></strong></span></dt>
<dd><p>
Reload the given zone.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>refresh <em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</code></strong></span></dt>
<dd><p>
Schedule zone maintenance for the given zone.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>retransfer <em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</code></strong></span></dt>
<dd>
<p>
Retransfer the given slave zone from the master server.
</p>
<p>
If the zone is configured to use
<span><strong class="command">inline-signing</strong></span>, the signed
version of the zone is discarded; after the
retransfer of the unsigned version is complete, the
signed version will be regenerated with all new
signatures.
</p>
</dd>
<dt><span class="term"><strong class="userinput"><code>sign <em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</code></strong></span></dt>
<dd>
<p>
Fetch all DNSSEC keys for the given zone
from the key directory (see the
<span><strong class="command">key-directory</strong></span> option in
the BIND 9 Administrator Reference Manual). If they are within
their publication period, merge them into the
zone's DNSKEY RRset. If the DNSKEY RRset
is changed, then the zone is automatically
re-signed with the new key set.
</p>
<p>
This command requires that the
<span><strong class="command">auto-dnssec</strong></span> zone option be set
to <code class="literal">allow</code> or
<code class="literal">maintain</code>,
and also requires the zone to be configured to
allow dynamic DNS.
(See "Dynamic Update Policies" in the Administrator
Reference Manual for more details.)
</p>
</dd>
<dt><span class="term"><strong class="userinput"><code>loadkeys <em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</code></strong></span></dt>
<dd>
<p>
Fetch all DNSSEC keys for the given zone
from the key directory. If they are within
their publication period, merge them into the
zone's DNSKEY RRset. Unlike <span><strong class="command">rndc
sign</strong></span>, however, the zone is not
immediately re-signed by the new keys, but is
allowed to incrementally re-sign over time.
</p>
<p>
This command requires that the
<span><strong class="command">auto-dnssec</strong></span> zone option
be set to <code class="literal">maintain</code>,
and also requires the zone to be configured to
allow dynamic DNS.
(See "Dynamic Update Policies" in the Administrator
Reference Manual for more details.)
</p>
</dd>
<dt><span class="term"><strong class="userinput"><code>freeze [<span class="optional"><em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</span>]</code></strong></span></dt>
<dd><p>
Suspend updates to a dynamic zone. If no zone is
specified, then all zones are suspended. This allows
manual edits to be made to a zone normally updated by
dynamic update. It also causes changes in the
journal file to be synced into the master file.
All dynamic update attempts will be refused while
the zone is frozen.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>thaw [<span class="optional"><em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</span>]</code></strong></span></dt>
<dd><p>
Enable updates to a frozen dynamic zone. If no
zone is specified, then all frozen zones are
enabled. This causes the server to reload the zone
from disk, and re-enables dynamic updates after the
load has completed. After a zone is thawed,
dynamic updates will no longer be refused. If
the zone has changed and the
<span><strong class="command">ixfr-from-differences</strong></span> option is
in use, then the journal file will be updated to
reflect changes in the zone. Otherwise, if the
zone has changed, any existing journal file will be
removed.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>sync [<span class="optional">-clean</span>] [<span class="optional"><em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</span>]</code></strong></span></dt>
<dd><p>
Sync changes in the journal file for a dynamic zone
to the master file. If the "-clean" option is
specified, the journal file is also removed. If
no zone is specified, then all zones are synced.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>notify <em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</code></strong></span></dt>
<dd><p>
Resend NOTIFY messages for the zone.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>reconfig</code></strong></span></dt>
<dd><p>
Reload the configuration file and load new zones,
but do not reload existing zone files even if they
have changed.
This is faster than a full <span><strong class="command">reload</strong></span> when there
is a large number of zones because it avoids the need
to examine the
modification times of the zones files.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>zonestatus [<span class="optional"><em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>]</span>]</code></strong></span></dt>
<dd><p>
Displays the current status of the given zone,
including the master file name and any include
files from which it was loaded, when it was most
recently loaded, the current serial number, the
number of nodes, whether the zone supports
dynamic updates, whether the zone is DNSSEC
signed, whether it uses automatic DNSSEC key
management or inline signing, and the scheduled
refresh or expiry times for the zone.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>stats</code></strong></span></dt>
<dd><p>
Write server statistics to the statistics file.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>querylog</code></strong> [<span class="optional">on|off</span>] </span></dt>
<dd>
<p>
Enable or disable query logging. (For backward
compatibility, this command can also be used without
an argument to toggle query logging on and off.)
</p>
<p>
Query logging can also be enabled
by explicitly directing the <span><strong class="command">queries</strong></span>
<span><strong class="command">category</strong></span> to a
<span><strong class="command">channel</strong></span> in the
<span><strong class="command">logging</strong></span> section of
<span><strong class="command">querylog yes;</strong></span> in the
<span><strong class="command">options</strong></span> section of
</p>
</dd>
<dt><span class="term"><strong class="userinput"><code>dumpdb [<span class="optional">-all|-cache|-zone</span>] [<span class="optional"><em class="replaceable"><code>view ...</code></em></span>]</code></strong></span></dt>
<dd><p>
the
dump file for the specified views. If no view is
specified, all
views are dumped.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>secroots [<span class="optional"><em class="replaceable"><code>view ...</code></em></span>]</code></strong></span></dt>
<dd><p>
Dump the server's security roots to the secroots
file for the specified views. If no view is
specified, security roots for all
views are dumped.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>stop [<span class="optional">-p</span>]</code></strong></span></dt>
<dd><p>
Stop the server, making sure any recent changes
made through dynamic update or IXFR are first saved to
the master files of the updated zones.
If <code class="option">-p</code> is specified <span><strong class="command">named</strong></span>'s process id is returned.
This allows an external process to determine when <span><strong class="command">named</strong></span>
had completed stopping.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>halt [<span class="optional">-p</span>]</code></strong></span></dt>
<dd><p>
Stop the server immediately. Recent changes
made through dynamic update or IXFR are not saved to
the master files, but will be rolled forward from the
journal files when the server is restarted.
If <code class="option">-p</code> is specified <span><strong class="command">named</strong></span>'s process id is returned.
This allows an external process to determine when <span><strong class="command">named</strong></span>
had completed halting.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>trace</code></strong></span></dt>
<dd><p>
Increment the servers debugging level by one.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>trace <em class="replaceable"><code>level</code></em></code></strong></span></dt>
<dd><p>
Sets the server's debugging level to an explicit
value.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>notrace</code></strong></span></dt>
<dd><p>
Sets the server's debugging level to 0.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>flush</code></strong></span></dt>
<dd><p>
Flushes the server's cache.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>flushname</code></strong> <em class="replaceable"><code>name</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>] </span></dt>
<dd><p>
Flushes the given name from the server's DNS cache
and, if applicable, from the server's nameserver address
database or bad-server cache.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>flushtree</code></strong> [<span class="optional">-all</span>] <em class="replaceable"><code>name</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>] </span></dt>
<dd><p>
Flushes the given name, and all of its subdomains,
from the server's DNS cache, the address database,
and the bad server cache.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>status</code></strong></span></dt>
<dd><p>
Display status of the server.
Note that the number of zones includes the internal <span><strong class="command">bind/CH</strong></span> zone
hint zone if there is not an
explicit root zone configured.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>recursing</code></strong></span></dt>
<dd><p>
Dump the list of queries <span><strong class="command">named</strong></span> is currently recursing
on.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>validation ( on | off | check ) [<span class="optional"><em class="replaceable"><code>view ...</code></em></span>] </code></strong></span></dt>
<dd><p>
Enable, disable, or check the current status of
DNSSEC validation.
Note <span><strong class="command">dnssec-enable</strong></span> also needs to be
set to <strong class="userinput"><code>yes</code></strong> or
<strong class="userinput"><code>auto</code></strong> to be effective.
It defaults to enabled.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>tsig-list</code></strong></span></dt>
<dd><p>
List the names of all TSIG keys currently configured
for use by <span><strong class="command">named</strong></span> in each view. The
list both statically configured keys and dynamic
TKEY-negotiated keys.
</p></dd>
<dt><span class="term"><strong class="userinput"><code>tsig-delete</code></strong> <em class="replaceable"><code>keyname</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span></dt>
<dd><p>
Delete a given TKEY-negotiated key from the server.
(This does not apply to statically configured TSIG
keys.)
</p></dd>
<dt><span class="term"><strong class="userinput"><code>addzone <em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>] <em class="replaceable"><code>configuration</code></em> </code></strong></span></dt>
<dd>
<p>
Add a zone while the server is running. This
command requires the
<span><strong class="command">allow-new-zones</strong></span> option to be set
to <strong class="userinput"><code>yes</code></strong>. The
<em class="replaceable"><code>configuration</code></em> string
specified on the command line is the zone
configuration text that would ordinarily be
</p>
<p>
The configuration is saved in a file called
<code class="filename"><em class="replaceable"><code>hash</code></em>.nzf</code>,
where <em class="replaceable"><code>hash</code></em> is a
cryptographic hash generated from the name of
the view. When <span><strong class="command">named</strong></span> is
restarted, the file will be loaded into the view
configuration, so that zones that were added
can persist after a restart.
</p>
<p>
This sample <span><strong class="command">addzone</strong></span> command
to the default view:
</p>
<p>
<code class="prompt">$ </code><strong class="userinput"><code>rndc addzone example.com '{ type master; file "example.com.db"; };'</code></strong>
</p>
<p>
(Note the brackets and semi-colon around the zone
configuration text.)
</p>
</dd>
<dt><span class="term"><strong class="userinput"><code>delzone [<span class="optional">-clean</span>] <em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>] </code></strong></span></dt>
<dd>
<p>
Delete a zone while the server is running.
Only zones that were originally added via
<span><strong class="command">rndc addzone</strong></span> can be deleted
in this manner.
</p>
<p>
If the <code class="option">-clean</code> is specified,
the zone's master file (and journal file, if any)
will be deleted along with the zone. Without the
<code class="option">-clean</code> option, zone files must
be cleaned up by hand. (If the zone is of
type "slave" or "stub", the files needing to
be cleaned up will be reported in the output
of the <span><strong class="command">rndc delzone</strong></span> command.)
</p>
</dd>
<dt><span class="term"><strong class="userinput"><code>signing [<span class="optional">( -list | -clear <em class="replaceable"><code>keyid/algorithm</code></em> | -clear <code class="literal">all</code> | -nsec3param ( <em class="replaceable"><code>parameters</code></em> | <code class="literal">none</code> ) ) </span>] <em class="replaceable"><code>zone</code></em> [<span class="optional"><em class="replaceable"><code>class</code></em> [<span class="optional"><em class="replaceable"><code>view</code></em></span>]</span>] </code></strong></span></dt>
<dd>
<p>
List, edit, or remove the DNSSEC signing state for
the specified zone. The status of ongoing DNSSEC
operations (such as signing or generating
NSEC3 chains) is stored in the zone in the form
of DNS resource records of type
<span><strong class="command">sig-signing-type</strong></span>.
<span><strong class="command">rndc signing -list</strong></span> converts
these records into a human-readable form,
indicating which keys are currently signing
or have finished signing the zone, and which NSEC3
chains are being created or removed.
</p>
<p>
<span><strong class="command">rndc signing -clear</strong></span> can remove
a single key (specified in the same format that
<span><strong class="command">rndc signing -list</strong></span> uses to
display it), or all keys. In either case, only
completed keys are removed; any record indicating
that a key has not yet finished signing the zone
will be retained.
</p>
<p>
<span><strong class="command">rndc signing -nsec3param</strong></span> sets
the NSEC3 parameters for a zone. This is the
only supported mechanism for using NSEC3 with
<span><strong class="command">inline-signing</strong></span> zones.
Parameters are specified in the same format as
an NSEC3PARAM resource record: hash algorithm,
flags, iterations, and salt, in that order.
</p>
<p>
Currently, the only defined value for hash algorithm
is <code class="literal">1</code>, representing SHA-1.
The <code class="option">flags</code> may be set to
<code class="literal">0</code> or <code class="literal">1</code>,
depending on whether you wish to set the opt-out
bit in the NSEC3 chain. <code class="option">iterations</code>
defines the number of additional times to apply
the algorithm when generating an NSEC3 hash. The
<code class="option">salt</code> is a string of data expressed
in hexadecimal, or a hyphen (`-') if no salt is
to be used.
</p>
<p>
So, for example, to create an NSEC3 chain using
the SHA-1 hash algorithm, no opt-out flag,
10 iterations, and a salt value of "FFFF", use:
<span><strong class="command">rndc signing -nsec3param 1 0 10 FFFF <em class="replaceable"><code>zone</code></em></strong></span>.
To set the opt-out flag, 15 iterations, and no
salt, use:
<span><strong class="command">rndc signing -nsec3param 1 1 15 - <em class="replaceable"><code>zone</code></em></strong></span>.
</p>
<p>
<span><strong class="command">rndc signing -nsec3param none</strong></span>
removes an existing NSEC3 chain and replaces it
with NSEC.
</p>
</dd>
</dl></div>
</div>
<div class="refsect1" lang="en">
<a name="id2686210"></a><h2>LIMITATIONS</h2>
<p>
There is currently no way to provide the shared secret for a
<code class="option">key_id</code> without using the configuration file.
</p>
<p>
Several error messages could be clearer.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2686296"></a><h2>SEE ALSO</h2>
<span class="citerefentry"><span class="refentrytitle">rndc-confgen</span>(8)</span>,
<span class="citerefentry"><span class="refentrytitle">named</span>(8)</span>,
<span class="citerefentry"><span class="refentrytitle">ndc</span>(8)</span>,
<em class="citetitle">BIND 9 Administrator Reference Manual</em>.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2686352"></a><h2>AUTHOR</h2>
<p><span class="corpauthor">Internet Systems Consortium</span>
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