Upgrading from an older samba4 installation. * Compile the new version of samba4 by following the HOWTO, but do not install it yet, and do not run provision. * Stop any samba process * Backup your samba4 provision: go into the directory where your samba4 provision is stored (/usr/local/samba by default) do tar cf $HOME/backup.tar private etc var sysvol * do make install * run 'samba-tool dbcheck' This will do a consistency check of the data, and is all most existing installations will require. If you are upgrading from a quite old provision (Samba 4.0 alpha 13 or earlier) then running upgradeprovision will do an upgrade of security descriptors, and upgradeprovision --full will perform a more comprehensive upgrade of the data (including schema and display specifiers). This attempts to do a new provision, and to then copy existing data into that database. If you are upgrading from a more recent version, particularly alpha16 or later, then it is better *NOT* to run upgradeprovision as the database format has not changed. To upgrade from BIND9 flat files to the internal database store for Bind 9 DLZ, use ./source4/scripting/bin/samba_upgradedns