[Samba] errors restoring samba

[Adam Weremczuk]

Hi Rowland,

I've decided to roll back samba on DC1 to the state from a couple of 
weeks ago, before I started all this mess...

Since the email subject change :)

Stopped bind9 and sernet-samba-ad and copied /var/lib/samba aside.

Restored samba folder from backup, started sernet-samba-ad but bind9 
fails to start:

Jul 22 14:39:39 dc1 named[27846]: generating session key for dynamic DNS
Jul 22 14:39:39 dc1 named[27846]: sizing zone task pool based on 5 zones
Jul 22 14:39:39 dc1 named[27846]: Loading 'AD DNS Zone' using driver dlopen
Jul 22 14:39:39 dc1 named[27846]: samba_dlz: Failed to connect to 
/var/lib/samba/private/dns/sam.ldb
Jul 22 14:39:39 dc1 named[27846]: dlz_dlopen of 'AD DNS Zone' failed
Jul 22 14:39:39 dc1 named[27846]: SDLZ driver failed to load.
Jul 22 14:39:39 dc1 named[27846]: DLZ driver failed to load.
Jul 22 14:39:39 dc1 named[27846]: loading configuration: failure
Jul 22 14:39:39 dc1 named[27846]: exiting (due to fatal error)

Initially I thought permissions / ownership issues but the current and 
the backup copy looks identical:

dc1:/# getfacl var/lib/samba/private/dns/sam.ldb
# file: var/lib/samba/private/dns/sam.ldb
# owner: root
# group: bind
user::rw-
group::rw-
other::---

dc1:/# getfacl var/tmp/bacula-restores/var/lib/samba/private/dns/sam.ldb
# file: var/tmp/bacula-restores/var/lib/samba/private/dns/sam.ldb
# owner: root
# group: bind
user::rw-
group::rw-
other::---

Files have the same size and time stamps, both last modified in 2013.

Also no difference in ownership and permissions for the parent 
samba/private/dns folders.

After rolling back /var/lib/samba and restarting services DNS and AD are 
working again.

Any ideas?

Thanks,
Adam