Anoop C S 2e25cc
Downgrading Samba
Anoop C S 2e25cc
=================
Anoop C S 2e25cc
Anoop C S 2e25cc
Short version: data-preserving downgrades between Samba versions are not supported
Anoop C S 2e25cc
Anoop C S 2e25cc
Long version:
Anoop C S 2e25cc
With Samba development there are cases when on-disk database format evolves.
Anoop C S 2e25cc
In general, Samba Team attempts to maintain forward compatibility and
Anoop C S 2e25cc
automatically upgrade databases during runtime when requires.
Anoop C S 2e25cc
However, when downgrade is required Samba will not perform downgrade to
Anoop C S 2e25cc
existing databases. It may be impossible if new features that caused database
Anoop C S 2e25cc
upgrade are in use. Thus, one needs to consider a downgrade procedure before
Anoop C S 2e25cc
actually downgrading Samba setup.
Anoop C S 2e25cc
Anoop C S 2e25cc
Please always perform back up prior both upgrading and downgrading across major
Anoop C S 2e25cc
version changes. Restoring database files is easiest and simplest way to get to
Anoop C S 2e25cc
previously working setup.
Anoop C S 2e25cc
Anoop C S 2e25cc
Easiest way to downgrade is to remove all created databases and start from scratch.
Anoop C S 2e25cc
This means losing all authentication and domain relationship data, as well as
Anoop C S 2e25cc
user databases (in case of tdb storage), printers, registry settings, and winbindd
Anoop C S 2e25cc
caches.
Anoop C S 2e25cc
Anoop C S 2e25cc
Remove databases in following locations:
Anoop C S 2e25cc
/var/lib/samba/*.tdb
Anoop C S 2e25cc
/var/lib/samba/private/*.tdb
Anoop C S 2e25cc
Anoop C S 2e25cc
In particular, registry settings are known to prevent running downgraded versions
Anoop C S 2e25cc
(Samba 4 to Samba 3) as registry format has changed between Samba 3 and Samba 4.