Manual Reference Pages - KRB5KDC (8)
krb5kdc - Kerberos V5 KDC
level margin: \n[rst2man-indent\n[rst2man-indent-level]]
krb5kdc is the Kerberos version 5 Authentication Service and Key
Distribution 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 database can be found. This option does not apply to the
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
The -M mkeyname option specifies the principal name for the
master key in the database (usually K/M in the KDCs 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 -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
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.
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
The -x db_args option specifies database-specific arguments.
See Database Options in kadmin(1) for
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.
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.
krb5kdc uses the following environment variables:
kdb5_util(8), kdc.conf(5), krb5.conf(5),
Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.