[Samba] Issue with computer accounts with classicupgrade

Brady, Mike mike.brady at devnull.net.nz
Tue Sep 1 07:32:29 UTC 2015

On 2015-08-12 10:35, Brady, Mike wrote:
> I have an old Centos5/Samba3.5 domain with LDAP backend that I am
> attempting to migrate to the latest Samba 4.2 on Centos 7.1.  Samba in
> both cases has been installed using Sernet packages.
> I had successfully run the classicupgrade process, but in subsequent
> testing found that in the 3.5 domain all the computer accounts have
> the posixAccount class and therefore have a uidNumber.  Unfortunately
> the uidNumbers are duplicated  with the user uidNumbers which doesn't
> seem to be an issue in the 3.5 domain, but is in the Samba 4 domain.
> My first attempt at fixing this was to use an LDIF file to remove the
>  posixAccount class and its attributes for all the machine accounts,
> as I did not believe that they were required.  But, this gave the
> following error when running the classicupgrade:
> samba-tool domain classicupgrade -d 3 --dbdir=/root/samba.PDC/
> --use-xattrs=yes --realm=ad.companyname.co.nz --dns-backend=BIND9_DLZ
> /root/samba.PDC/smb.conf
> Reading smb.conf
> lp_load_ex: refreshing parameters
> Initialising global parameters
> rlimit_max: increasing rlimit_max (1024) to minimum Windows limit 
> (16384)
> Processing section "[global]"
> WARNING: The "idmap backend" option is deprecated
> WARNING: The "idmap uid" option is deprecated
> WARNING: The "idmap gid" option is deprecated
> Provisioning
> Exporting account policy
> Exporting groups
> Exporting users
> init_sam_from_ldap: Failed to find Unix account for VM07$
> ldapsam_getsampwnam: init_sam_from_ldap failed for user 'VM07$'!
> ERROR(<class 'passdb.error'>): uncaught exception - Unable to get user
> information for 'VM07$', (-1073741724,No such user)
>   File "/usr/lib64/python2.7/site-packages/samba/netcmd/__init__.py",
> line 175, in _run
>     return self.run(*args, **kwargs)
>   File "/usr/lib64/python2.7/site-packages/samba/netcmd/domain.py",
> line 1452, in run
>     useeadb=eadb, dns_backend=dns_backend, use_ntvfs=use_ntvfs)
>   File "/usr/lib64/python2.7/site-packages/samba/upgrade.py", line
> 566, in upgrade_from_samba3
>     user = s3db.getsampwnam(username)
> So I created another LDIF that just changes all the machine account
> uidNumbers to something that does not conflict with the user
> uidNumbers.
> The classicupgrade process completes with this.  I haven't done any
> further testing yet, but this should resolve the issues that I was
> seeing because of the duplicated uidNumbers.
> Using ADSIEdit to look at a freshly installed domain, shows that
> computer accounts do not have uidNumber, gidNumber, etc assigned.  I
> am therefore puzzled as to why the classicupgrade seems to need them.
> I am not sure what the end result should be with regards to the
> machine accounts after the classicupgrade and am therefore looking for
> advice on what I should be doing (as opposed to what I have done) to
> resolve this issue.
> Thanks
> Mike

No one got any ideas?

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