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KRB5KDC(8) MIT Kerberos KRB5KDC(8)
NAME
krb5kdc - Kerberos V5 KDC
SYNOPSIS
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-
set]
DESCRIPTION
krb5kdc is the Kerberos version 5 Authentication Service and Key Dis-
tribution Center (AS/KDC).
OPTIONS
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 spec-
ified in krb5.conf(5)) will be served.
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
aes256-cts-hmac-sha1-96.
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.
The -P pid_file option tells the KDC to write its PID into pid_file af-
ter 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 de-
fault 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 op-
tion 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.
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.
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 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.
ENVIRONMENT
See kerberos(7) for a description of Kerberos environment variables.
SEE ALSO
kdb5_util(8), kdc.conf(5), krb5.conf(5), kdb5_ldap_util(8), kerberos(7)
AUTHOR
MIT
COPYRIGHT
1985-2022, MIT
1.20.1 KRB5KDC(8)
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