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 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.

       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.   See  Database  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.

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

       1985-2017, MIT

1.16                                                                                                  KRB5KDC(8)