1KRB5KDC(8) MIT Kerberos KRB5KDC(8)
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6 krb5kdc - Kerberos V5 KDC
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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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14 krb5kdc is the Kerberos version 5 Authentication Service and Key Dis‐
15 tribution Center (AS/KDC).
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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.
22 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.
25 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.
29 The -M mkeyname option specifies the principal name for the master key
31 in the database (usually K/M in the KDC's realm).
32 The -m option specifies that the master database password should be
34 fetched from the keyboard rather than from a stash file.
35 The -n option specifies that the KDC does not put itself in the back‐
37 ground and does not disassociate itself from the terminal.
38 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.
42 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.
49 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.
57 The -x db_args option specifies database-specific arguments. See
59 Database Options in kadmin for supported arguments.
60 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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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.
69 For example:
71 krb5kdc -p 2001 -r REALM1 -p 2002 -r REALM2 -r REALM3
73 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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82 See kerberos for a description of Kerberos environment variables.
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85 kdb5_util, kdc.conf, krb5.conf, kdb5_ldap_util, kerberos
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88 MIT
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91 1985-2023, MIT
921.21.2 KRB5KDC(8)