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.
20 The -d dbname option specifies the name under which the principal data‐
22 base can be found. This option does not apply to the LDAP database.
23 The -k keytype option specifies the key type of the master key to be
25 entered manually as a password when -m is given; the default is
26 des-cbc-crc.
27 The -M mkeyname option specifies the principal name for the master key
29 in the database (usually K/M in the KDC's realm).
30 The -m option specifies that the master database password should be
32 fetched from the keyboard rather than from a stash file.
33 The -n option specifies that the KDC does not put itself in the back‐
35 ground and does not disassociate itself from the terminal. In normal
36 operation, you should always allow the KDC to place itself in the back‐
37 ground.
38 The -P pid_file option tells the KDC to write its PID into pid_file
40 after 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 port numbers which the
44 KDC should listen on for Kerberos version 5 requests, as a comma-sepa‐
45 rated list. This value overrides the UDP port numbers specified in the
46 kdcdefaults section of kdc.conf(5), but may be overridden by realm-spe‐
47 cific values. If no value is given from any source, the default port
48 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
53 option 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 NOTE:
59 On operating systems which do not have pktinfo support, using worker
60 processes will prevent the KDC from listening for UDP packets on
61 network interfaces created after the KDC starts.
62 The -x db_args option specifies database-specific arguments. See Data‐
64 base Options in kadmin(1) for supported arguments.
65 The -T offset option specifies a time offset, in seconds, which the KDC
67 will operate under. It is intended only for testing purposes.
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70 The KDC may service requests for multiple realms (maximum 32 realms).
71 The realms are listed on the command line. Per-realm options that can
72 be specified on the command line pertain for each realm that follows it
73 and are superseded by subsequent definitions of the same option.
74 For example:
76 krb5kdc -p 2001 -r REALM1 -p 2002 -r REALM2 -r REALM3
78 specifies that the KDC listen on port 2001 for REALM1 and on port 2002
80 for REALM2 and REALM3. Additionally, per-realm parameters may be spec‐
81 ified in the kdc.conf(5) file. The location of this file may be speci‐
82 fied by the KRB5_KDC_PROFILE environment variable. Per-realm parame‐
83 ters specified in this file take precedence over options specified on
84 the command line. See the kdc.conf(5) description for further details.
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87 krb5kdc uses the following environment variables:
88 · KRB5_CONFIG
90 · KRB5_KDC_PROFILE
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94 kdb5_util(8), kdc.conf(5), krb5.conf(5), kdb5_ldap_util(8)
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97 MIT
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100 1985-2017, MIT
1011.15.1 KRB5KDC(8)