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man pages section 8: System Administration Commands

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Updated: Thursday, June 13, 2019

krb5kdc (8)


krb5kdc - Kerberos V5 KDC


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


KRB5KDC(8)                       MIT Kerberos                       KRB5KDC(8)

       krb5kdc - Kerberos V5 KDC

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

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

       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 data-
       base 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

       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  back-
       ground  and  does not disassociate itself from the terminal.  In normal
       operation, you should always allow the KDC to place itself in the back-

       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-sepa-
       rated list.  This value overrides the UDP port numbers specified in the
       kdcdefaults section of kdc.conf(5), but may be overridden by realm-spe-
       cific  values.   If no value is given from any source, the default port
       is 88.

       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.

          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.  See Data-
       base Options in kadmin(1) for supported arguments.

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

       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 spec-
       ified in the kdc.conf(5) file.  The location of this file may be speci-
       fied by the KRB5_KDC_PROFILE environment variable.   Per-realm  parame-
       ters  specified  in this file take precedence over options specified on
       the command line.  See the kdc.conf(5) description for further details.

       krb5kdc uses the following environment variables:

       o KRB5_CONFIG


       See attributes(7) for descriptions of the following attributes:

       |Availability   | security/kerberos-5/kdc |
       |Stability      | Pass-through committed  |
       kdb5_util(8), kdc.conf(5), krb5.conf(5), kdb5_ldap_util(8)


       1985-2018, MIT

       The krb5kdc service is managed  by  the  service  management  facility,
       smf(5), under the service identifier:


       Administrative actions on this service, such as enabling, disabling, or
       requesting restart, can be performed using  svcadm(1M).  The  service's
       status can be queried using the svcs(1) command.

       This     software     was    built    from    source    available    at
       https://github.com/oracle/solaris-userland.   The  original   community
       source      was      downloaded      from      https://web.mit.edu/ker-

       Further information about this software can be found on the open source
       community website at https://web.mit.edu/kerberos/.

1.16.1                                                              KRB5KDC(8)