1KRB5KDC(8)                       MIT Kerberos                       KRB5KDC(8)
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NAME

6       krb5kdc - Kerberos V5 KDC
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SYNOPSIS

9       krb5kdc  [-x  db_args] [-d dbname] [-k keytype] [-M mkeyname] [-p port‐
10       num] [-m] [-r realm] [-n] [-w numworkers] [-P pid_file]  [-T  time_off‐
11       set]
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DESCRIPTION

14       krb5kdc  is  the Kerberos version 5 Authentication Service and Key Dis‐
15       tribution Center (AS/KDC).
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OPTIONS

18       The -r realm option specifies the realm for  which  the  server  should
19       provide  service.  This option may be specified multiple times to serve
20       multiple realms.  If no -r option is given, the default realm (as spec‐
21       ified in krb5.conf) will be served.
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23       The -d dbname option specifies the name under which the principal data‐
24       base can be found.  This option does not apply to the LDAP database.
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26       The -k keytype option specifies the key type of the master  key  to  be
27       entered  manually  as  a  password  when  -m  is  given; the default is
28       aes256-cts-hmac-sha1-96.
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30       The -M mkeyname option specifies the principal name for the master  key
31       in the database (usually K/M in the KDC's realm).
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33       The  -m  option  specifies  that the master database password should be
34       fetched from the keyboard rather than from a stash file.
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36       The -n option specifies that the KDC does not put itself in  the  back‐
37       ground and does not disassociate itself from the terminal.
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39       The -P pid_file option tells the KDC to write its PID into pid_file af‐
40       ter it starts up.  This can be used to  identify  whether  the  KDC  is
41       still running and to allow init scripts to stop the correct process.
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43       The  -p  portnum  option specifies the default UDP and TCP port numbers
44       which the KDC should listen on for Kerberos version 5  requests,  as  a
45       comma-separated  list.  This value overrides the port numbers specified
46       in the [kdcdefaults] section of kdc.conf,  but  may  be  overridden  by
47       realm-specific  values.   If no value is given from any source, the de‐
48       fault port is 88.
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50       The -w numworkers option tells the KDC to fork numworkers processes  to
51       listen  to  the  KDC  ports  and process requests in parallel.  The top
52       level KDC process (whose pid is recorded in the pid file if the -P  op‐
53       tion  is  also  given) acts as a supervisor.  The supervisor will relay
54       SIGHUP signals to the  worker  subprocesses,  and  will  terminate  the
55       worker subprocess if the it is itself terminated or if any other worker
56       process exits.
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58       The -x  db_args  option  specifies  database-specific  arguments.   See
59       Database Options in kadmin for supported arguments.
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61       The -T offset option specifies a time offset, in seconds, which the KDC
62       will operate under.  It is intended only for testing purposes.
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EXAMPLE

65       The KDC may service requests for multiple realms (maximum  32  realms).
66       The  realms are listed on the command line.  Per-realm options that can
67       be specified on the command line pertain for each realm that follows it
68       and are superseded by subsequent definitions of the same option.
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70       For example:
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72          krb5kdc -p 2001 -r REALM1 -p 2002 -r REALM2 -r REALM3
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74       specifies  that the KDC listen on port 2001 for REALM1 and on port 2002
75       for REALM2 and REALM3.  Additionally, per-realm parameters may be spec‐
76       ified in the kdc.conf file.  The location of this file may be specified
77       by the KRB5_KDC_PROFILE  environment  variable.   Per-realm  parameters
78       specified  in  this  file take precedence over options specified on the
79       command line.  See the kdc.conf description for further details.
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ENVIRONMENT

82       See kerberos for a description of Kerberos environment variables.
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SEE ALSO

85       kdb5_util, kdc.conf, krb5.conf, kdb5_ldap_util, kerberos
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AUTHOR

88       MIT
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91       1985-2023, MIT
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961.21.2                                                              KRB5KDC(8)
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