knsupdate(1)

NAME

   knsupdate - Dynamic DNS update utility

SYNOPSIS

   knsupdate [options] [filename]

DESCRIPTION

   This  utility sends Dynamic DNS update messages to a DNS server. Update
   content is read from a file (if the parameter  filename  is  given)  or
   from the standard input.

   The  format  of  updates  is  textual and is made up of commands. Every
   command is placed on the separate line of  the  input.  Lines  starting
   with a semicolon are comments and are not processed.

   Options
   -d     Enable debug messages.

   -h, --help
          Print the program help.

   -k keyfile
          Use  the  TSIG  key stored in a file keyfile to authenticate the
          request. The file should contain the key  in  the  same  format,
          which is accepted by the -y option.

   -p port
          Set  the  port  to  use  for  connections  to the server (if not
          explicitly specified in the update). The default is 53.

   -r retries
          The number of retries for UDP requests. The default is 3.

   -t timeout
          The total timeout (for all  UDP  update  tries)  of  the  update
          request  in  seconds.   The  default  is 12. If set to zero, the
          timeout is infinite.

   -v     Use a TCP connection.

   -V, --version
          Print the program version.

   -y [alg:]name:key
          Use the TSIG key with a name name to authenticate  the  request.
          The  alg  part specifies the algorithm (the default is hmac-md5)
          and key specifies the shared secret encoded in Base64.

   Commands
   server name [port]
          Specifies a receiving server of the dynamic update message.  The
          name  parameter  can  be either a host name or an IP address. If
          the port is not specified, the default port is used. The default
          port value can be controlled using the -p program option.

   local address [port]
          Specifies  outgoing  address and port. If no local is specified,
          the address and port are set by the  system  automatically.  The
          default port number is 0.

   zone name
          Specifies  that  all updates are done within a zone name. If not
          used, the default zone is the root zone.

   origin name
          Specifies fully qualified domain name suffix which  is  appended
          to  non-fqd owners in update commands. The default origin is the
          root zone.

   class name
          Sets name as the default class for all updates. If not used, the
          default class is IN.

   ttl value
          Sets  value  as  the  default TTL (in seconds). If not used, the
          default value is 0.

   key [alg:]name key
          Specifies the TSIG key named name to authenticate  the  request.
          An optional alg algorithm can be specified. This command has the
          same effect as the program option -y.

   [prereq] nxdomain name
          Adds a prerequisite for a non-existing record owned by name.

   [prereq] yxdomain name
          Adds a prerequisite for an existing record owned by name.

   [prereq] nxrrset name [class] type
          Adds a prerequisite for a non-existing record of the type  owned
          by name.  Internet class is expected.

   [prereq] yxrrset name [class] type [data]
          Adds  a prerequisite for an existing record of the type owned by
          name with optional data. Internet class is expected.

   [update] add name [ttl] [class] type data
          Adds a request to add a  new  resource  record  into  the  zone.
          Please note that if the name is not fully qualified domain name,
          the current origin name is appended to it.

   [update] del[ete] name [ttl] [class] [type] [data]
          Adds a request to remove all (or matching class, type  or  data)
          resource  records  from  the zone. There is the same requirement
          for the name parameter as in update add command. The ttl item is
          ignored.

   show   Displays current content of the update message.

   send   Sends the current update message and cleans the list of updates.

   answer Displays the last answer from the server.

   debug  Enable  debugging.  This  command has the same meaning as the -d
          program option.

   quit   Quit the program.

NOTES

   Options -k and -y can not be used simultaneously.

   Dnssec-keygen keyfile format is not supported. Use keymgr(8) instead.

   Zone name/server guessing is not supported if the zone  name/server  is
   not specified.

   Empty line doesn't send the update.

EXAMPLES

   1. Send  one  update of the zone example.com to the server 192.168.1.1.
      The update contains two new records:

         $ knsupdate
         > server 192.168.1.1
         > zone example.com.
         > origin example.com.
         > ttl 3600
         > add test1.example.com. 7200 A 192.168.2.2
         > add test2 TXT "hello"
         > show
         > send
         > answer
         > quit

SEE ALSO

   kdig(1), khost(1), keymgr(8).

AUTHOR

   CZ.NIC Labs <http://www.knot-dns.cz>

COPYRIGHT

   Copyright 2010--2016, CZ.NIC, z.s.p.o.

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