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KRB5KDC(8) MIT Kerberos KRB5KDC(8)
krb5kdc - Kerberos V5 KDC
krb5kdc [-x db_args] [-d dbname] [-k keytype] [-M mkeyname] [-p
portnum] [-m] [-r realm] [-n] [-w numworkers] [-P pid_file] [-T
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. This option may be specified multiple times to serve
multiple realms. If no -r option is given, the default realm (as
specified in krb5.conf(5)) will be served.
The -d dbname option specifies the name under which the principal
database can be found. This option does not apply to the LDAP
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
background and does not disassociate itself from the terminal.
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 and TCP port numbers
which the KDC should listen on for Kerberos version 5 requests, as a
comma-separated list. This value overrides the 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
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.
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
See kerberos(7) for a description of Kerberos environment variables.
kdb5_util(8), kdc.conf(5), krb5.conf(5), kdb5_ldap_util(8), kerberos(7)