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.Dd May 24, 2005
.Dt IPROP 8
.Os Heimdal
.Sh NAME
.Nm iprop ,
.Nm ipropd-master ,
.Nm ipropd-slave
.Nd
propagate changes to a Heimdal Kerberos master KDC to slave KDCs
.Sh SYNOPSIS
.Nm ipropd-master
.Oo Fl c Ar string \*(Ba Xo
.Fl -config-file= Ns Ar string
.Xc
.Oc
.Oo Fl r Ar string \*(Ba Xo
.Fl -realm= Ns Ar string
.Xc
.Oc
.Oo Fl k Ar kspec \*(Ba Xo
.Fl -keytab= Ns Ar kspec
.Xc
.Oc
.Oo Fl d Ar file \*(Ba Xo
.Fl -database= Ns Ar file
.Xc
.Oc
.Op Fl -slave-stats-file= Ns Ar file
.Op Fl -time-missing= Ns Ar time
.Op Fl -time-gone= Ns Ar time
.Op Fl -detach
.Op Fl -version
.Op Fl -help
.Nm ipropd-slave
.Oo Fl c Ar string \*(Ba Xo
.Fl -config-file= Ns Ar string
.Xc
.Oc
.Oo Fl r Ar string \*(Ba Xo
.Fl -realm= Ns Ar string
.Xc
.Oc
.Oo Fl k Ar kspec \*(Ba Xo
.Fl -keytab= Ns Ar kspec
.Xc
.Oc
.Op Fl -time-lost= Ns Ar time
.Op Fl -detach
.Op Fl -version
.Op Fl -help
.Ar master
.Pp
.Sh DESCRIPTION
.Nm 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
.Nm ipropd-slave .
.Pp
The slaves are specified by the contents of the
.Pa slaves
file in the KDC's database directory, e.g.\&
.Pa /var/heimdal/slaves .
This has principals one per-line of the form
.Dl iprop/ Ns Ar slave Ns @ Ns Ar REALM
where 
.Ar slave 
is the hostname of the slave server in the given 
.Ar REALM ,
e.g.\&
.Dl iprop/kerberos-1.example.com@EXAMPLE.COM
On a slave, the argument
.Fa master
specifies the hostname of the master server from which to receive updates.
.Pp
In contrast to
.Xr hprop 8 ,
which sends the whole database to the slaves regularly,
.Nm
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 change 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 changes 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.
.Pp
The changes are propagated over a secure channel (on port 2121 by
default).  This should normally be defined as
.Dq iprop/tcp
in
.Pa /etc/services
or another source of the services database.  The master and slaves
must each have access to a keytab with keys for the
.Nm iprop
service principal on the local host.
.Pp
There is a keep-alive feature logged in the master's
.Pa slave-stats
file (e.g.\&
.Pa /var/heimdal/slave-stats ) .
.Pp
Supported options for
.Nm ipropd-master :
.Bl -tag -width Ds
.It Xo
.Fl c Ar string ,
.Fl -config-file= Ns Ar string
.Xc
.It Xo
.Fl r Ar string ,
.Fl -realm= Ns Ar string
.Xc
.It Xo
.Fl k Ar kspec ,
.Fl -keytab= Ns Ar kspec
.Xc
keytab to get authentication from
.It Xo
.Fl d Ar file ,
.Fl -database= Ns Ar file
.Xc
Database (default per KDC)
.It Xo
.Fl -slave-stats-file= Ns Ar file
.Xc
file for slave status information
.It Xo
.Fl -time-missing= Ns Ar time
.Xc
time before slave is polled for presence (default 2 min)
.It Xo
.Fl -time-gone= Ns Ar time
.Xc
time of inactivity after which a slave is considered gone (default 5 min)
.It Xo
.Fl -detach
.Xc
detach from console
.It Xo
.Fl -version
.Xc
.It Xo
.Fl -help
.Xc
.El
.Pp
Supported options for
.Nm ipropd-slave :
.Bl -tag -width Ds
.It Xo
.Fl c Ar string ,
.Fl -config-file= Ns Ar string
.Xc
.It Xo
.Fl r Ar string ,
.Fl -realm= Ns Ar string
.Xc
.It Xo
.Fl k Ar kspec ,
.Fl -keytab= Ns Ar kspec
.Xc
keytab to get authentication from
.It Xo
.Fl -time-lost= Ns Ar time
.Xc
time before server is considered lost (default 5 min)
.It Xo
.Fl -detach
.Xc
detach from console
.It Xo
.Fl -version
.Xc
.It Xo
.Fl -help
.Xc
.El
Time arguments for the relevant options above may be specified in forms
like 5 min, 300 s, or simply a number of seconds.
.Sh FILES
.Pa slaves ,
.Pa slave-stats
in the database directory.
.Sh SEE ALSO
.Xr hpropd 8 ,
.Xr hprop 8 ,
.Xr krb5.conf 8 , 
.Xr kdc 8 ,
.Xr iprop-log 8 .