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.Dd May 24, 2005
.Dt IPROP 8
.Os
.Sh NAME
.Nm iprop ,
.Nm ipropd-master ,
.Nm ipropd-slave
.Nd propagate transactions from a Heimdal Kerberos master KDC to slave KDCs
.Sh SYNOPSIS
.Nm ipropd-master
.Oo Fl c Ar string \*(Ba Xo
.Fl Fl config-file= Ns Ar string
.Xc
.Oc
.Oo Fl r Ar string \*(Ba Xo
.Fl Fl realm= Ns Ar string
.Xc
.Oc
.Oo Fl k Ar kspec \*(Ba Xo
.Fl Fl keytab= Ns Ar kspec
.Xc
.Oc
.Oo Fl d Ar file \*(Ba Xo
.Fl Fl database= Ns Ar file
.Xc
.Oc
.Op Fl Fl slave-stats-file= Ns Ar file
.Op Fl Fl time-missing= Ns Ar time
.Op Fl Fl time-gone= Ns Ar time
.Op Fl Fl detach
.Op Fl Fl version
.Op Fl Fl help
.Nm ipropd-slave
.Oo Fl c Ar string \*(Ba Xo
.Fl Fl config-file= Ns Ar string
.Xc
.Oc
.Oo Fl r Ar string \*(Ba Xo
.Fl Fl realm= Ns Ar string
.Xc
.Oc
.Oo Fl k Ar kspec \*(Ba Xo
.Fl Fl keytab= Ns Ar kspec
.Xc
.Oc
.Op Fl Fl time-lost= Ns Ar time
.Op Fl Fl detach
.Op Fl Fl version
.Op Fl Fl help
.Ar master
.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 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.
.Pp
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.
.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 Fl c Ar string , Fl Fl config-file= Ns Ar string
.It Fl r Ar string , Fl Fl realm= Ns Ar string
.It Fl k Ar kspec , Fl Fl keytab= Ns Ar kspec
keytab to get authentication from
.It Fl d Ar file , Fl Fl database= Ns Ar file
Database (default per KDC)
.It Fl Fl slave-stats-file= Ns Ar file
file for slave status information
.It Fl Fl time-missing= Ns Ar time
time before slave is polled for presence (default 2 min)
.It Fl Fl time-gone= Ns Ar time
time of inactivity after which a slave is considered gone (default 5 min)
.It Fl Fl detach
detach from console
.It Fl Fl version
.It Fl Fl help
.El
.Pp
Supported options for
.Nm ipropd-slave :
.Bl -tag -width Ds
.It Fl c Ar string , Fl Fl config-file= Ns Ar string
.It Fl r Ar string , Fl Fl realm= Ns Ar string
.It Fl k Ar kspec , Fl Fl keytab= Ns Ar kspec
keytab to get authentication from
.It Fl Fl time-lost= Ns Ar time
time before server is considered lost (default 5 min)
.It Fl Fl detach
detach from console
.It Fl Fl version
.It Fl Fl help
.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.
.Pa ipropd-master.pid ,
.Pa ipropd-slave.pid
in the database directory, or in the directory named by the
.Ev HEIM_PIDFILE_DIR
environment variable.
.Sh SEE ALSO
.Xr krb5.conf 5 ,
.Xr hprop 8 ,
.Xr hpropd 8 ,
.Xr iprop-log 8 ,
.Xr kdc 8 .