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rndc(8)                              BIND9                             rndc(8)


       rndc - name server control utility


       rndc [-b source-address] [-c config-file] [-k key-file] [-s server]
            [-p port] [-V] [-y key_id] {command}


       rndc controls the operation of a name server. It supersedes the ndc
       utility that was provided in old BIND releases. If rndc 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.

       rndc communicates with the name server over a TCP connection, sending
       commands authenticated with digital signatures. In the current versions
       of rndc and named, the only supported authentication algorithm is
       HMAC-MD5, which uses 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.

       rndc reads a configuration file to determine how to contact the name
       server and decide what algorithm and key it should use.


       -b source-address
           Use source-address 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.

       -c config-file
           Use config-file as the configuration file instead of the default,

       -k key-file
           Use key-file as the key file instead of the default, /etc/rndc.key.
           The key in /etc/rndc.key will be used to authenticate commands sent
           to the server if the config-file does not exist.

       -s server
           server is the name or address of the server which matches a server
           statement in the configuration file for rndc. If no server is
           supplied on the command line, the host named by the default-server
           clause in the options statement of the rndc configuration file will
           be used.

       -p port
           Send commands to TCP port port instead of BIND 9's default control
           channel port, 953.

           Enable verbose logging.

       -y key_id
           Use the key key_id from the configuration file.  key_id must be
           known by named with the same algorithm and secret string in order
           for control message validation to succeed. If no key_id is
           specified, rndc 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.


       A list of commands supported by rndc can be seen by running rndc
       without arguments.

       Currently supported commands are:

           Reload configuration file and zones.

       reload zone [class [view]]
           Reload the given zone.

       refresh zone [class [view]]
           Schedule zone maintenance for the given zone.

       retransfer zone [class [view]]
           Retransfer the given slave zone from the master server.

           If the zone is configured to use inline-signing, 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.

       sign zone [class [view]]
           Fetch all DNSSEC keys for the given zone from the key directory
           (see the key-directory 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.

           This command requires that the auto-dnssec zone option be set to
           allow or maintain, and also requires the zone to be configured to
           allow dynamic DNS. (See "Dynamic Update Policies" in the
           Administrator Reference Manual for more details.)

       loadkeys zone [class [view]]
           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 rndc sign, however, the zone is not
           immediately re-signed by the new keys, but is allowed to
           incrementally re-sign over time.

           This command requires that the auto-dnssec zone option be set to
           maintain, and also requires the zone to be configured to allow
           dynamic DNS. (See "Dynamic Update Policies" in the Administrator
           Reference Manual for more details.)

       freeze [zone [class [view]]]
           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.

       thaw [zone [class [view]]]
           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
           ixfr-from-differences 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.

       sync [-clean] [zone [class [view]]]
           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.

       notify zone [class [view]]
           Resend NOTIFY messages for the zone.

           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 reload when there is a large number of zones because it
           avoids the need to examine the modification times of the zones

           Write server statistics to the statistics file.

       querylog [on|off]
           Enable or disable query logging. (For backward compatibility, this
           command can also be used without an argument to toggle query
           logging on and off.)

           Query logging can also be enabled by explicitly directing the
           queries category to a channel in the logging section of named.conf
           or by specifying querylog yes; in the options section of

       dumpdb [-all|-cache|-zone] [view ...]
           Dump the server's caches (default) and/or zones to the dump file
           for the specified views. If no view is specified, all views are

       secroots [view ...]
           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.

       stop [-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 -p is specified named's process id is returned.
           This allows an external process to determine when named had
           completed stopping.

       halt [-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 -p is specified named's process id is returned. This allows an
           external process to determine when named had completed halting.

           Increment the servers debugging level by one.

       trace level
           Sets the server's debugging level to an explicit value.

           Sets the server's debugging level to 0.

           Flushes the server's cache.

       flushname name [view]
           Flushes the given name from the server's DNS cache and, if
           applicable, from the server's nameserver address database or
           bad-server cache.

       flushtree name [view]
           Flushes the given name, and all of its subdomains, from the
           server's DNS cache. Note that this does not affect he server's
           address database or bad-server cache.

           Display status of the server. Note that the number of zones
           includes the internal bind/CH zone and the default ./IN hint zone
           if there is not an explicit root zone configured.

           Dump the list of queries named is currently recursing on.

       validation ( on | off | check ) [view ...]
           Enable, disable, or check the current status of DNSSEC validation.
           Note dnssec-enable also needs to be set to yes or auto to be
           effective. It defaults to enabled.

           List the names of all TSIG keys currently configured for use by
           named in each view. The list both statically configured keys and
           dynamic TKEY-negotiated keys.

       tsig-delete keyname [view]
           Delete a given TKEY-negotiated key from the server. (This does not
           apply to statically configured TSIG keys.)

       addzone zone [class [view]] configuration
           Add a zone while the server is running. This command requires the
           allow-new-zones option to be set to yes. The configuration string
           specified on the command line is the zone configuration text that
           would ordinarily be placed in named.conf.

           The configuration is saved in a file called hash.nzf, where hash is
           a cryptographic hash generated from the name of the view. When
           named is restarted, the file will be loaded into the view
           configuration, so that zones that were added can persist after a

           This sample addzone command would add the zone to the
           default view:

           $rndc addzone '{ type master; file "";

           (Note the brackets and semi-colon around the zone configuration

       delzone zone [class [view]]
           Delete a zone while the server is running. Only zones that were
           originally added via rndc addzone can be deleted in this manner.

       signing [( -list | -clear keyid/algorithm | -clear all | -nsec3param (
       parameters | none ) ) ] zone [class [view]]
           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 sig-signing-type.  rndc signing -list
           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.

           rndc signing -clear can remove a single key (specified in the same
           format that rndc signing -list 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.

           rndc signing -nsec3param sets the NSEC3 parameters for a zone. This
           is the only supported mechanism for using NSEC3 with inline-signing
           zones. Parameters are specified in the same format as an NSEC3PARAM
           resource record: hash algorithm, flags, iterations, and salt, in
           that order.

           Currently, the only defined value for hash algorithm is 1,
           representing SHA-1. The flags may be set to 0 or 1, depending on
           whether you wish to set the opt-out bit in the NSEC3 chain.
           iterations defines the number of additional times to apply the
           algorithm when generating an NSEC3 hash. The salt is a string of
           data expressed in hexadecimal, or a hyphen (`-') if no salt is to
           be used.

           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: rndc signing -nsec3param 1 0 10 FFFF zone. To set the
           opt-out flag, 15 iterations, and no salt, use: rndc signing
           -nsec3param 1 1 15 - zone.

           rndc signing -nsec3param none removes an existing NSEC3 chain and
           replaces it with NSEC.


       There is currently no way to provide the shared secret for a key_id
       without using the configuration file.

       Several error messages could be clearer.


       rndc.conf(5), rndc-confgen(8), named(8), named.conf(5), ndc(8), BIND 9
       Administrator Reference Manual.


       Internet Systems Consortium


       Copyright (C) 2004, 2005, 2007, 2013 Internet Systems Consortium, Inc.
       Copyright (C) 2000, 2001 Internet Software Consortium.

BIND9                            June 7, 2013                          rndc(8)

bind 9.9.5 - Generated Sun Feb 9 09:32:03 CST 2014
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