Backing up samba4

[Andrew Bartlett]

On Wed, 2012-09-19 at 18:42 +0100, Rowland Penny wrote:
> On 19/09/12 18:03, Andrew Bartlett wrote:
> > On Wed, 2012-09-19 at 15:31 +0100, Rowland Penny wrote:
> >> On 19/09/12 14:55, Marc Muehlfeld wrote:
> >>> Am 19.09.2012 15:27, schrieb steve:
> >>>> I just did it on a test LAN. I deleted /usr/local/samba and rsynced
> >>>> it back.
> >>>> samba fired up fine. xp and w7 clients could log in and GPO's were
> >>>> respected.
> >>>>
> >>>> What is the problem in doing this? It works with openSUSE 12.2. It
> >>>> fails with
> >>>> ubuntu lts.
> >>> I guess it worked, because during the rsync, nothing was changed in
> >>> the tdb/ldb files, because it's a small test network. If you have a
> >>> bigger network, where the databases often changes, it could happen
> >>> that this appears during your rsync. Then you have a
> >>> corrupt/inconsistent "backup".
> >>>
> >>> I think for the tdb/ldb files tdbdump is a must.
> >>>
> >>> In my backup script I run tdbbackup for all that files to generate the
> >>> *.bak of them and then tar the whole to a save place (with ext. ACLs).
> >>> So I can copy it back and have a hopefully save backup of the
> >>> databases if neccessary.
> >>>
> >>>
> >>>
> >>>
> >>> On Rowlands initial question, how to to restore tdbbackup files:
> >>> https://lists.samba.org/archive/samba/2012-June/167878.html
> >>>
> >>> I haven't tried it yet. But let me know if tdbrestore is the working way.
> >>>
> >>>
> >>> Regards,
> >>> Marc
> >>>
> >>>
> >>>
> >>>
> >> Hi, the one thing about samba 4 you can be sure of, is that you will get
> >> confused easily ;-)
> >>
> >> on one hand:
> >>
> >> On 19/09/12 12:17, Ricky Nance wrote:
> >>   >
> >>   >  Yes simply removing the .bak will be sufficient, you can also use
> >> tdbrestore.
> >>   >
> >>
> >> on the other hand:
> >>
> >> Marc posts a link to a previous post that says:
> >>
> >> Use tdbrestore to restore tdb files.
> >> tdbback dbname.tdb>  dbname-backup
> >> tdbrestore dbname.tdb<  dbname-backup
> >>
> >> Is what Ricky Nance wrote correct, can you just remove the .bak? or
> >> would it be better to use tdbrestore and if so, are the given commands
> >> correct?
> > Ricky is correct in this instance.
> >
> > tdbbackup creates a second, live and ready-to-use tdb that can then be
> > copied because nothing else is using it.  The other command pair you are
> > trying to refer to to tdbdump and tdbrestore, which creates a larger
> > text file representations of the data, and creates a fresh tdb from that
> > text file.  These are really more development tools, but could be useful
> > in some very, very low level debugging situations.  This is not needed
> > for typical backup/restore.
> >
> > In the link provided, Amitay got the tdbbakcup and tdbdump tools
> > confused.
> >
> > Andrew Bartlett
> >
> Thanks Andrew, but I now have one more question, I have a lot of .tdb 
> files in /usr/local/samba/var/lock
> & /usr/local/samba/var/locks , there are also some wins.* files in the 
> locks dir. Do these need backing up?

It is better to back up too much than too little.  Some of these will be
runtime only, and we do have a concept of which is which in the code,
but on an issue of backups, I would just get them all and let Samba wipe
some clean after the restore.

Andrew Bartlett

-- 
Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org