NAME

       krb5kdc - Kerberos V5 KDC

SYNOPSIS

       krb5kdc  [-x  db_args] [-d dbname] [-k keytype] [-M mkeyname] [-p portnum] [-m] [-r realm]
       [-n] [-w numworkers] [-P pid_file] [-T time_offset]

DESCRIPTION

       krb5kdc is the Kerberos version 5  Authentication  Service  and  Key  Distribution  Center
       (AS/KDC).

OPTIONS

       The -r realm option specifies the realm for which the server should provide service.

       The  -d  dbname option specifies the name under which the principal database can be found.
       This option does not apply to the LDAP database.

       The -k keytype option specifies the key type of the master key to be entered manually as a
       password when -m is given; the default is des-cbc-crc.

       The  -M  mkeyname  option  specifies the principal name for the master key in the database
       (usually K/M in the KDC's realm).

       The -m option specifies that the master database  password  should  be  fetched  from  the
       keyboard rather than from a stash file.

       The  -n  option  specifies that the KDC does not put itself in the background and does not
       disassociate itself from the terminal.  In normal operation, you should always  allow  the
       KDC to place itself in the background.

       The  -P  pid_file  option tells the KDC to write its PID into pid_file after it starts up.
       This can be used to identify whether the KDC is still running and to allow init scripts to
       stop the correct process.

       The  -p  portnum option specifies the default UDP port numbers which the KDC should listen
       on for Kerberos version 5 requests, as a comma-separated list.  This value  overrides  the
       UDP  port  numbers  specified  in  the  kdcdefaults  section  of  kdc.conf(5),  but may be
       overridden by realm-specific values.  If no value is given from any  source,  the  default
       ports are 88 and 750.

       The  -w  numworkers option tells the KDC to fork numworkers processes to listen to the KDC
       ports and process requests in parallel.  The top level KDC process (whose pid is  recorded
       in the pid file if the -P option is also given) acts as a supervisor.  The supervisor will
       relay SIGHUP signals to the worker subprocesses, and will terminate the worker  subprocess
       if the it is itself terminated or if any other worker process exits.

       Note   On operating systems which do not have pktinfo support, using worker processes will
              prevent the KDC from listening for UDP packets on network interfaces created  after
              the KDC starts.

       The  -x  db_args  option specifies database-specific arguments.  Options supported for the
       LDAP database module are:

          -x nconns=<number_of_connections>
                 Specifies the number of connections to be maintained per LDAP server.

          -x host=<ldapuri>
                 Specifies the LDAP server to connect to by URI.

          -x binddn=<binddn>
                 Specifies the DN of the object used by the  KDC  server  to  bind  to  the  LDAP
                 server.   This  object  should  have  read  and  write  privileges  to the realm
                 container, the principal container, and the subtree that is  referenced  by  the
                 realm.

          -x bindpwd=<bind_password>
                 Specifies  the  password  for the above mentioned binddn.  Using this option may
                 expose the password to other users on the system via the process list; to  avoid
                 this,   instead   stash   the   password   using   the   stashsrvpw  command  of
                 kdb5_ldap_util(8).

          -x debug=level
                 sets the OpenLDAP client library  debug  level.   level  is  an  integer  to  be
                 interpreted  by  the library.  Debugging messages are printed to standard error,
                 so this option must be used with the -n option to be  useful.   New  in  release
                 1.12.

       The  -T  offset  option  specifies  a  time offset, in seconds, which the KDC will operate
       under.  It is intended only for testing purposes.

EXAMPLE

       The KDC may service requests for multiple realms (maximum  32  realms).   The  realms  are
       listed  on  the command line.  Per-realm options that can be specified on the command line
       pertain for each realm that follows it and are superseded by subsequent definitions of the
       same option.

       For example:

          krb5kdc -p 2001 -r REALM1 -p 2002 -r REALM2 -r REALM3

       specifies  that  the  KDC  listen  on port 2001 for REALM1 and on port 2002 for REALM2 and
       REALM3.  Additionally, per-realm parameters may be specified in the kdc.conf(5) file.  The
       location  of  this  file  may  be  specified by the KRB5_KDC_PROFILE environment variable.
       Per-realm parameters specified in this file take precedence over options specified on  the
       command line.  See the kdc.conf(5) description for further details.

ENVIRONMENT

       krb5kdc uses the following environment variables:

       • KRB5_CONFIG

       • KRB5_KDC_PROFILE

SEE ALSO

       kdb5_util(8), kdc.conf(5), krb5.conf(5), kdb5_ldap_util(8)

AUTHOR

       MIT

COPYRIGHT

       1985-2013, MIT