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+.. _krb5kdc(8):
+
+krb5kdc
+=======
+
+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 :ref:`kdcdefaults` section of :ref:`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 :ref:`Database Options <dboptions>` in :ref:`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 :ref:`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 :ref:`kdc.conf(5)`
+description for further details.
+
+
+ENVIRONMENT
+-----------
+
+krb5kdc uses the following environment variables:
+
+* **KRB5_CONFIG**
+* **KRB5_KDC_PROFILE**
+
+
+SEE ALSO
+--------
+
+:ref:`kdb5_util(8)`, :ref:`kdc.conf(5)`, :ref:`krb5.conf(5)`,
+:ref:`kdb5_ldap_util(8)`