KPROPD(8) MIT Kerberos KPROPD(8)
kpropd - Kerberos V5 slave KDC update server
kpropd [-r realm] [-a acl_file] [-f slave_dumpfile] [-F principal_database] [-p kdb5_util_prog] [-P port] [-d]
The kpropd command runs on the slave KDC server. It listens for update requests made by the kprop(8) program. If incremental propagation
is enabled, it periodically requests incremental updates from the master KDC.
When the slave receives a kprop request from the master, 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 master Kerberos server to
use kprop(8) to propagate its database to the slave servers. Upon a successful download of the KDC database file, the slave 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. This is required for incremental propagation. But this is also useful for debugging purposes.
Incremental propagation may be enabled with the iprop_enable variable in kdc.conf(5). If incremental propagation is enabled, the slave
periodically polls the master KDC for updates, at an interval determined by the iprop_slave_poll variable. If the slave receives updates,
kpropd updates its log file with any updates from the master. kproplog(8) can be used to view a summary of the update entry log on the
slave KDC. If incremental propagation is enabled, the principal kiprop/slavehostname@REALM (where slavehostname is the name of the slave
KDC host, and REALM is the name of the Kerberos realm) must be present in the slave's keytab file.
kproplog(8) can be used to force full replication when iprop is enabled.
Specifies the realm of the master server.
Specifies the filename where the dumped principal database file is to be stored; by default the dumped database file is /var/ker-
-p Allows the user to specify the pathname to the kdb5_util(8) program; by default the pathname used is /usr/sbin/kdb5_util.
-S [DEPRECATED] Enable standalone mode. Normally kpropd is invoked by inetd(8) so it expects a network connection to be passed to it
from inetd(8). If the -S option is specified, or if standard input is not a socket, kpropd will put itself into the background, and
wait for connections on port 754 (or the port specified with the -P option if given).
-d Turn on debug mode. In this mode, if the -S option is selected, 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 during the database propagation.
-P Allow for an alternate port number for kpropd to listen on. This is only useful in combination with the -S option.
Allows the user to specify the path to the kpropd.acl file; by default the path used is /var/kerberos/krb5kdc/kpropd.acl.
kpropd uses the following environment variables:
Access file for kpropd; the default location is /usr/local/var/krb5kdc/kpropd.acl. Each entry is a line containing the principal of
a host from which the local machine will allow Kerberos database propagation via kprop(8).
kprop(8), kdb5_util(8), krb5kdc(8), inetd(8)