kpropd(8) MIT Kerberos kpropd(8)
NAME
kpropd - Kerberos V5 replica KDC update server
SYNOPSIS
kpropd [-r realm] [-A admin_server] [-a acl_file] [-f replica_dumpfile] [-F principal_database] [-p kdb5_util_prog] [-P port] [--pid-file=pid_file] [-d] [-t]
DESCRIPTION
The kpropd command runs on the replica KDC server. It listens for update requests made by the kprop(8) program. If incremental propaga- tion is enabled, it periodically requests incremental updates from the primary KDC. When the replica receives a kprop request from the primary, kpropd accepts the dumped KDC database and places it in a file, and then runs kdb5_util(8) to load the dumped database into the active database which is used by krb5kdc(8). This allows the primary Kerberos server to use kprop(8) to propagate its database to the replica servers. Upon a suc- cessful download of the KDC database file, the replica Kerberos server will have an up-to-date KDC database. Where incremental propagation is not used, kpropd is commonly invoked out of inetd(8) as a nowait service. This is done by adding a line to the /etc/inetd.conf file which looks like this: kprop stream tcp nowait root /usr/local/sbin/kpropd kpropd kpropd can also run as a standalone daemon, backgrounding itself and waiting for connections on port 754 (or the port specified with the -P option if given). Standalone mode is required for incremental propaga- tion. Starting in release 1.11, kpropd automatically detects whether it was run from inetd and runs in standalone mode if it is not. Prior to release 1.11, the -S option is required to run kpropd in standalone mode; this option is now accepted for backward compatibility but does nothing. Incremental propagation may be enabled with the iprop_enable variable in kdc.conf(5). If incremental propagation is enabled, the replica periodically polls the primary KDC for updates, at an interval deter- mined by the iprop_replica_poll variable. If the replica receives updates, kpropd updates its log file with any updates from the primary. kproplog(8) can be used to view a summary of the update entry log on the replica KDC. If incremental propagation is enabled, the principal kiprop/replicahostname@REALM (where replicahostname is the name of the replica KDC host, and REALM is the name of the Kerberos realm) must be present in the replica's keytab file. kproplog(8) can be used to force full replication when iprop is enabled.
OPTIONS
-r realm Specifies the realm of the primary server. -A admin_server Specifies the server to be contacted for incremental updates; by default, the primary admin server is contacted. -f file Specifies the filename where the dumped principal database file is to be stored; by default the dumped database file is /opt/local/var/krb5kdc/from_master. -p Allows the user to specify the pathname to the kdb5_util(8) pro- gram; by default the pathname used is /opt/local/sbin/kdb5_util. -d Turn on debug mode. In this mode, kpropd will not detach itself from the current job and run in the background. Instead, it will run in the foreground and print out debugging messages dur- ing the database propagation. -t In standalone mode without incremental propagation, exit after one dump file is received. In incremental propagation mode, exit as soon as the database is up to date, or if the primary returns an error. -P Allow for an alternate port number for kpropd to listen on. This is only useful in combination with the -S option. -a acl_file Allows the user to specify the path to the kpropd.acl file; by default the path used is /opt/local/var/krb5kdc/kpropd.acl. --pid-file=pid_file In standalone mode, write the process ID of the daemon into pid_file.
ENVIRONMENT
kpropd uses the following environment variables: o KRB5_CONFIG o KRB5_KDC_PROFILE
FILES
kpropd.acl Access file for kpropd; the default location is /usr/local/var/krb5kdc/kpropd.acl. Each entry is a line con- taining the principal of a host from which the local machine will allow Kerberos database propagation via kprop(8).
ENVIRONMENT
See kerberos(7) for a description of Kerberos environment variables.
SEE ALSO
kprop(8), kdb5_util(8), krb5kdc(8), kerberos(7), inetd(8)
AUTHOR
MIT
COPYRIGHT
1985-2021, MIT 1.19 kpropd(8)
kerberos5 1.19 - Generated Thu Feb 11 15:19:51 CST 2021