[Samba] backend migration and Samba upgrade.

Bastien Semene bsemene at cyanide-studio.com
Wed May 5 07:37:36 MDT 2010

Short background :
Due to Windows Seven deplaoyment we have to upgrade Samba 3.0 to Samba 
3.4 (actually less version but I see no reason not to go directly to 3.4).
And due to SQL backend support aborted we have to switch from SQL 
backend to LDAP backend.

What I have in mind to do this migration is the following :

-install samba 34/OpenLDAP (I also change the machine in the meantime)
-configure Samba 34 to use the ldap backend, the smb.conf will be 
rewriten from scratch.
- sync the sid with net getlocalsid and netsetlocalsid.
-pdbedit -e to export users and pdbedit -eg to export groups (on the old 
-pdbedit -i and pdbedit -ig on the new server.

I'm far to be an expert in Samba, so advices on this procedure are very 

While checking that everything should be ok, I did a pdbedit -L and many 
lines (less than 1000) like this one appeared :
lookup_global_sam_rid: looking up RID 513.
Executing query SELECT 
Can't find a unix id for an unmapped group
No user SID retrieved from database!

There are 3 RIDs concerned : 513, 11001, 515.

Can I correct this error before migrating ? Is it mandatory/interesting 
to correct this error ?

This is the output of the testparm command :

Load smb config files from /usr/local/etc/smb.conf
Processing section "[netlogon]"
Unknown parameter encountered: "readable"
Ignoring unknown parameter "readable"
Loaded services file OK.
Server role: ROLE_DOMAIN_PDC
Press enter to see a dump of your service definitions

         dos charset = 850
         unix charset = ISO8859-1
         workgroup = CYANIDE
         netbios name = PDC
         server string = Primary Domain Controller
         passdb backend = mysql:foo
         passwd program = /usr/local/bin/php -q 
/root/CyanManager/samba/update_mysql_password.php %u
         passwd chat = "password:" %n\n "ok\n"
         passwd chat debug = Yes
         unix password sync = Yes
         log level = 5
         log file = /var/log/samba/log.%m
         fam change notify = No
         load printers = No
         domain logons = Yes
         os level = 128
         preferred master = Yes
         domain master = Yes
         dns proxy = No
         wins support = Yes
         foo:unknown 6 column = nt_unknown_6
         foo:logon count column = nt_logon_count
         foo:bad password count column = nt_bad_password_count
         foo:logon hours column = nt_logon_hours
         foo:hours len column = nt_hours_len
         foo:logon divs column = nt_logon_divs
         foo:acct ctrl column = nt_acct_ctrl
         foo:plain pass column = NULL
         foo:nt pass column = nt_pw
         foo:lanman pass column = nt_lm_pw
         foo:group sid column = nt_group_sid
         foo:user sid column = nt_user_sid
         foo:munged dial column = nt_munged_dial
         foo:unknown string column = nt_unknown_str
         foo:workstations column = nt_workstations
         foo:acct desc column = nt_acct_desc
         foo:profile path column = nt_profile_path
         foo:logon script column = nt_logon_script
         foo:dir drive column = nt_dir_drive
         foo:home dir column = nt_homedir
         foo:fullname column = gecos
         foo:nt username column = nt_username
         foo:domain column = nt_domain
         foo:username column = username
         foo:pass history = NULL
         foo:pass must change time column = nt_pass_must_change_time
         foo:pass can change time column = nt_pass_can_change_time
         foo:pass last set time column = nt_pass_last_set_time
         foo:kickoff time column = nt_kickoff_time
         foo:logoff time column = nt_logoff_time
         foo:logon time column = nt_logon_time
         foo:mysql database = ***********
         foo:mysql password = ************
         foo:mysql user = ********
         foo:mysql host =
         foo:host =
         admin users = administrateur

         path = /var/samba/netlogon
         browseable = No

Bastien Semene
Administrateur Réseau&  Système

Cyanide Studio - FRANCE

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