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157.

Make sure a user has rights to read the files in <filename>/var/lib/samba</filename>. For example, to allow users in the <emphasis>admin</emphasis> group to <application>scp</application> the files, enter:

158.

sudo chgrp -R admin /var/lib/samba

159.

Next, sync the user accounts, using <application>scp</application> to copy the <filename>/var/lib/samba</filename> directory from the PDC:

160.

sudo scp -r username@pdc:/var/lib/samba /var/lib

161.

Replace <emphasis>username</emphasis> with a valid username and <emphasis>pdc</emphasis> with the hostname or IP Address of the actual PDC.

162.

Finally, restart <application>samba</application>:

163.

Test that the Backup Domain controller is working by stopping the Samba daemon on the PDC, then trying to login to a Windows client joined to the domain.

164.

If the <emphasis>logon home</emphasis> option has been configured as a directory on the PDC, and the PDC becomes unavailable, access to the user's <emphasis>Home</emphasis> drive will also be unavailable. For this reason, it is best to configure the <emphasis>logon home</emphasis> to reside on a separate file server from the PDC and BDC.

165.

<ulink url="http://samba.org/samba/docs/man/Samba-HOWTO-Collection/samba-pdc.html"> Chapter 4</ulink> of the Samba HOWTO Collection explains setting up a Primary Domain Controller.

166.

<ulink url="http://us3.samba.org/samba/docs/man/Samba-HOWTO-Collection/samba-bdc.html"> Chapter 5</ulink> of the Samba HOWTO Collection explains setting up a Backup Domain Controller.