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iprop - Man Page

propagate transactions from a Heimdal Kerberos master KDC to slave KDCs


ipropd-master[-c string | --config-file=string] [-r string | --realm=string] [-k kspec | --keytab=kspec] [-d file | --database=file] [--slave-stats-file=file] [--time-missing=time] [--time-gone=time] [--detach] [--version] [--help]
ipropd-slave[-c string | --config-file=string] [-r string | --realm=string] [-k kspec | --keytab=kspec] [--time-lost=time] [--detach] [--version] [--help] master


ipropd-master is used to propagate changes to a Heimdal Kerberos database from the master Kerberos server on which it runs to slave Kerberos servers running ipropd-slave.

The slaves are specified by the contents of the slaves file in the KDC's database directory, e.g. /var/heimdal/slaves. This has principals one per-line of the form


where slave is the hostname of the slave server in the given REALM, e.g.


On a slave, the argument master specifies the hostname of the master server from which to receive updates.

In contrast to hprop(8), which sends the whole database to the slaves regularly, iprop normally sends only the changes as they happen on the master. The master keeps track of all the changes by assigning a version number to every transaction to the database. The slaves know which was the latest version they saw, and in this way it can be determined if they are in sync or not. A log of all the transactions is kept on the master. When a slave is at an older version than the oldest one in the log, the whole database has to be sent.

The log of transactions is also used to implement a two-phase commit (with roll-forward for recovery) method of updating the HDB. Transactions are first recorded in the log, then in the HDB, then the log is updated to mark the transaction as committed.

The changes are propagated over a secure channel (on port 2121 by default). This should normally be defined as “iprop/tcp” in /etc/services or another source of the services database. The master and slaves must each have access to a keytab with keys for the iprop service principal on the local host.

There is a keep-alive feature logged in the master's slave-stats file (e.g. /var/heimdal/slave-stats).

Supported options for ipropd-master:

-c string, --config-file=string
-r string, --realm=string
-k kspec, --keytab=kspec

keytab to get authentication from

-d file, --database=file

Database (default per KDC)


file for slave status information


time before slave is polled for presence (default 2 min)


time of inactivity after which a slave is considered gone (default 5 min)


detach from console


Supported options for ipropd-slave:

-c string, --config-file=string
-r string, --realm=string
-k kspec, --keytab=kspec

keytab to get authentication from


time before server is considered lost (default 5 min)


detach from console


Time arguments for the relevant options above may be specified in forms like 5 min, 300 s, or simply a number of seconds.


slaves, slave-stats in the database directory. ipropd-master.pid, ipropd-slave.pid in the database directory, or in the directory named by the HEIM_PIDFILE_DIR environment variable.

See Also

krb5.conf(5), hprop(8), hpropd(8), iprop-log(8), kdc(8).

Referenced By


The man pages ipropd-master(8) and ipropd-slave(8) are aliases of iprop(8).

May 24, 2005