path: root/doc/man_knotc.rst

.. highlight:: console

``knotc`` – Knot DNS control utility
====================================

Synopsis
--------

:program:`knotc` [*parameters*] *action* [*action_args*]

Description
-----------

This program controls a running `knotd` process using a socket.

If an *action* is specified, it is performed and `knotc` exits, otherwise the program
is executed in the interactive mode.

Options
.......

**-c**, **--config** *file*
  Use a textual configuration file (default is :file:`@config_dir@/knot.conf`).

**-C**, **--confdb** *directory*
  Use a binary configuration database directory (default is :file:`@storage_dir@/confdb`).
  The default configuration database, if exists, has a preference to the default
  configuration file.

**-m**, **--max-conf-size** *MiB*
  Set maximum size of the configuration database
  (default is @conf_mapsize@ MiB, maximum 10000 MiB).

**-s**, **--socket** *path*
  Use a control UNIX socket path (default is :file:`@run_dir@/knot.sock`).

**-t**, **--timeout** *seconds*
  Use a control timeout in seconds. Set to 0 for infinity (default is 60).
  The control socket operations are also subject to the :ref:`timeout<control_timeout>`
  parameter set on the server side in server's Control configuration section.

**-b**, **--blocking**
  Zone event trigger commands wait until the event is finished. Control timeout
  is set to infinity if not forced by explicit timeout specification.

**-e**, **--extended**
  Show extended output (even empty items in zone status).

**-f**, **--force**
  Forced operation. Overrides some checks.

**-x**, **--mono**
  Don't generate colorized output.

**-X**, **--color**
  Force colorized output in extended output or to a pipe.

**-v**, **--verbose**
  Enable debug output.

**-h**, **--help**
  Print the program help.

**-V**, **--version**
  Print the program version.

Actions
.......

**status** [*detail*]
  Check if the server is running. Details are **version** for the running
  server version, **workers** for the numbers of worker threads,
  or **configure** for the configure summary.

**stop**
  Stop the server if running.

**reload**
  Reload the server configuration and modified zone files. All open zone
  transactions will be aborted!

**stats** [*module*\ [\ **.**\ *counter*\ ]]
  Show global statistics counter(s). To print also counters with value 0, use
  force option.

**zone-check** [*zone*...]
  Test if the server can load the zone. Semantic checks are executed if enabled
  in the configuration. If invoked with the force option, an error is returned
  when semantic check warning appears. (*)

**zone-status** [*zone*...] [*filter*]
  Show the zone status. Filters are **+role**, **+serial**, **+transaction**,
  **+events**, **+freeze**, and **+catalog**. Empty zone parameters are omitted,
  unless the **--extended** option is used. A single dash in the output represents
  an unset value. Automatic colorization can be overruled using the **--mono** and
  **--color** options.

  The color code is:
  *green* - zone acts as a master / *red* - zone acts as a slave,
  *bold font (highlited)* - zone is active / *normal* - zone is empty,
  *underscored* - zone is an interpreted catalog member.

**zone-reload** [*zone*...]
  Trigger a zone reload from a disk without checking its modification time. For
  secondary zone, the refresh event from primary server(s) is scheduled;
  for primary zone, the notify event to secondary server(s) is scheduled. An open
  zone transaction will be aborted! If invoked with the force option, also zone
  modules will be re-loaded, but blocking mode might not work reliably. (#)

**zone-refresh** [*zone*...]
  Trigger a check for the zone serial on the zone's primary server. If
  the primary server has a newer zone, a transfer is scheduled. This command is
  valid for secondary zones. (#)

**zone-retransfer** [*zone*...]
  Trigger a zone transfer from the zone's primary server. The server
  doesn't check the serial of the primary server's zone. This command is valid
  for secondary zones. (#)

**zone-notify** [*zone*...]
  Trigger a NOTIFY message to all configured remotes. This can help in cases
  when previous NOTIFY had been lost or the secondary servers have been
  offline. (#)

**zone-flush** [*zone*...] [**+outdir** *directory*]
  Trigger a zone journal flush to the configured zone file. If an output
  directory is specified, the current zone is immediately dumped (in the
  blocking mode) to a zone file in the specified directory. See
  :ref:`Notes<notes>` below about the directory permissions. (#)

**zone-backup** [*zone*...] **+backupdir** *directory* [*filter*...]
  Trigger a zone data and metadata backup to a specified directory.
  Available filters are **+zonefile**, **+journal**, **+timers**, **+kaspdb**,
  **+catalog**, and their negative counterparts **+nozonefile**, **+nojournal**,
  **+notimers**, **+nokaspdb**, and **+nocatalog**. With these filters set,
  zone contents, zone's journal, zone related timers, zone related data in the
  KASP database together with keys, and zone's catalog, respectively, are backed up,
  or omitted from the backup. By default, filters **+zonefile**, **+timers**,
  **+kaspdb**, **+catalog**, and **+nojournal** are set. Setting a filter
  for an item doesn't change default settings for other items. If zone flushing
  is disabled, original zone file is backed up instead of writing out zone
  contents to a file. See :ref:`Notes<notes>` below about the directory
  permissions. (#)

**zone-restore** [*zone*...] **+backupdir** *directory* [*filter*...]
  Trigger a zone data and metadata restore from a specified backup directory.
  Optional filters are equivalent to the same filters of **zone-backup**.
  Restore from backups created by Knot DNS releases prior to 3.1 is possible
  with the force option. See :ref:`Notes<notes>` below about the directory
  permissions. (#)

**zone-sign** [*zone*...]
  Trigger a DNSSEC re-sign of the zone. Existing signatures will be dropped.
  This command is valid for zones with DNSSEC signing enabled. (#)

**zone-keys-load** [*zone*...]
  Trigger a load of DNSSEC keys and other signing material from KASP database
  (which might have been altered manually). If suitable, re-sign the zone
  afterwards (keeping valid signatures intact). (#)

**zone-key-rollover** *zone* *key_type*
  Trigger immediate key rollover. Publish new key and start a key rollover,
  even when the key has a lifetime to go. Key type can be **ksk** (also for CSK)
  or **zsk**. This command is valid for zones with DNSSEC signing and automatic
  key management enabled. Note that complete key rollover consists of several steps
  and the blocking mode relates to the initial one only! (#)

**zone-ksk-submitted** *zone*...
  Use when the zone's KSK rollover is in submission phase. By calling this command
  the user confirms manually that the parent zone contains DS record for the new
  KSK in submission phase and the old KSK can be retired. (#)

**zone-freeze** [*zone*...]
  Trigger a zone freeze. All running events will be finished and all new and pending
  (planned) zone-changing events (load, refresh, update, flush, and DNSSEC signing)
  will be held up until the zone is thawed. (#)

**zone-thaw** [*zone*...]
  Trigger dismissal of zone freeze. (#)

**zone-xfr-freeze** [*zone*...]
  Temporarily disable outgoing AXFR/IXFR for the zone(s). (#)

**zone-xfr-thaw** [*zone*...]
  Dismiss outgoing XFR freeze. (#)

**zone-read** *zone* [*owner* [*type*]]
  Get zone data that are currently being presented.

**zone-begin** *zone*...
  Begin a zone transaction.

**zone-commit** *zone*...
  Commit the zone transaction. All changes are applied to the zone.

**zone-abort** *zone*...
  Abort the zone transaction. All changes are discarded.

**zone-diff** *zone*
  Get zone changes within the transaction.

**zone-get** *zone* [*owner* [*type*]]
  Get zone data within the transaction.

**zone-set** *zone* *owner* [*ttl*] *type* *rdata*
  Add zone record within the transaction. The first record in a rrset
  requires a ttl value specified.

**zone-unset** *zone* *owner* [*type* [*rdata*]]
  Remove zone data within the transaction.

**zone-purge** *zone*... [**+orphan**] [*filter*...]
  Purge zone data, zone file, journal, timers, and/or KASP data of specified zones.
  Available filters are **+expire**, **+zonefile**, **+journal**, **+timers**,
  **+kaspdb**, and **+catalog**. If no filter is specified, all filters are enabled.
  If the zone is no longer configured, add **+orphan** parameter (zone file cannot
  be purged in this case). When purging orphans, always check the server log for
  possible errors. This command always requires the force option. (#)

**zone-stats** *zone* [*module*\ [\ **.**\ *counter*\ ]]
  Show zone statistics counter(s). To print also counters with value 0, use
  force option.

**conf-init**
  Initialize the configuration database. If the database doesn't exist yet,
  execute this command as an intended user to ensure the server is permitted
  to access the database (e.g. *sudo -u knot knotc conf-init*). (*)

**conf-check**
  Check the server configuration. (*)

**conf-import** *filename*
  Import a configuration file into the configuration database. If the database
  doesn't exist yet, execute this command as an intended user to ensure the server
  is permitted to access the database (e.g. *sudo -u knot knotc conf-import ...*).
  Also ensure the server is not using the configuration database at the same time! (*)

**conf-export** [*filename*]
  Export the configuration database into a config file or stdout. (*)

**conf-list** [*item*]
  List the configuration database sections or section items.

**conf-read** [*item*]
  Read the item from the active configuration database.

**conf-begin**
  Begin a writing configuration database transaction. Only one transaction
  can be opened at a time.

**conf-commit**
  Commit the configuration database transaction.

**conf-abort**
  Rollback the configuration database transaction.

**conf-diff** [*item*]
  Get the item difference in the transaction.

**conf-get** [*item*]
  Get the item data from the transaction.

**conf-set** *item* [*data*...]
  Set the item data in the transaction.

**conf-unset** [*item*] [*data*...]
  Unset the item data in the transaction.

.. _notes:

Notes
.....

Empty or **--** *zone* parameter means all zones or all zones with a transaction.

Use **@** *owner* to denote the zone name.

Type *item* parameter in the form of *section*\ [**[**\ *id*\ **]**\ ][**.**\ *name*].

(*) indicates a local operation which requires a configuration.

(\#) indicates an optionally blocking operation.

The **-b** and **-f** options can be placed right after the command name.

Responses returned by `knotc` commands depend on the mode:

- In the blocking mode, `knotc` reports if an error occurred during processing
  of the command by the server. If an error is reported, a more detailed information
  about the failure can usually be found in the server log.

- In the non-blocking (default) mode, `knotc` doesn't report processing errors.
  The `OK` response to triggering commands means that the command has been successfully
  sent to the server. To verify if the operation succeeded, it's necessary to
  check the server log.

Actions **zone-flush**, **zone-backup**, and **zone-restore** are carried out by
the `knotd` process. The directory specified must be accessible to the user account
that `knotd` runs under and if the directory already exists, its permissions must be
appropriate for that user account.

Interactive mode
................

The utility provides interactive mode with basic line editing functionality,
command completion, and command history.

Interactive mode behavior can be customized in `~/.editrc`. Refer to
:manpage:`editrc(5)` for details.

Command history is saved in `~/.knotc_history`.

Exit values
-----------

Exit status of 0 means successful operation. Any other exit status indicates
an error.

Examples
--------

Reload the whole server configuration
.....................................

::

  $ knotc reload

Flush the example.com and example.org zones
...........................................

::

  $ knotc zone-flush example.com example.org

Get the current server configuration
....................................

::

  $ knotc conf-read server

Get the list of the current zones
.................................

::

  $ knotc conf-read zone.domain

Get the primary servers for the example.com zone
................................................

::

  $ knotc conf-read 'zone[example.com].master'

Add example.org zone with a zonefile location
.............................................

::

  $ knotc conf-begin
  $ knotc conf-set 'zone[example.org]'
  $ knotc conf-set 'zone[example.org].file' '/var/zones/example.org.zone'
  $ knotc conf-commit

Get the SOA record for each configured zone
...........................................

::

  $ knotc zone-read -- @ SOA

See Also
--------

:manpage:`knotd(8)`, :manpage:`knot.conf(5)`, :manpage:`editrc(5)`.