[Samba] Samba4 AD Corrupted Member

[Edson Tadeu Almeida da Silveira]

Hi Andrew!

Thanks for you suggest. I did that.

I have Demoted my DC2 and promoted with a clear configuration and
everything is ok again.

I really don´t known i could this happen. I keep my two Domain controller
in two different environment, DC1 with Vmware and DC2 with Xenserver.

Thanks again!!!



2017-05-22 21:44 GMT-03:00 Andrew Bartlett <abartlet at samba.org>:

> On Mon, 2017-05-22 at 12:28 -0300, Edson Tadeu Almeida da Silveira via
> samba wrote:
> > Hi Guys.
> >
> > Today i experienced a problem with my samba 4 AD.
> >
> > I have a master(AD1) and a member(AD2) in a replicated environment.
> >
> > I´ve just checked that my AD2 has some issues when i did this test:
> >
> > -------------------------------------------------------------------
> > ---------------
> > ldbsearch --url=/usr/local/samba/private/sam.ldb '(invocationid=*)'
> > --cross-ncs objectguid
> >
> > # record 1
> > dn: CN=NTDS
> > Settings,CN=AD2,CN=Servers,CN=Default-First-Site-
> > Name,CN=Sites,CN=Configuration,DC=domain,DC=local
> > objectGUID: 3b885301-279f-4dd7-92ce-cc6f6dfd5e34
> >
> > # record 2
> > dn: CN=NTDS
> > Settings,CN=AD1,CN=Servers,CN=Default-First-Site-
> > Name,CN=Sites,CN=Configuration,DC=domain,DC=local
> > objectGUID: 21a051e3-0e5c-4ffd-af1b-a7edeb348325
> >
> > ltdb: tdb(/usr/local/samba/private/sam.ldb.d/DC=DOMAIN,DC=LOCAL.ldb):
> > tdb_rec_read bad magic 0xd9fee666 at offset=250263808
> >
> > search error - Indexed and full searches both failed!
> > -------------------------------------------------------------------
> > ---------------
> >
> > In my AD1 everything is ok.
> >
> > Do you known if there is a way to repair my AD2 ?
> >
> > Thanks!
>
> If you do not have any data stranded on AD2, just demote it (samba-tool
> domain demote --remove-other-dead-server) and re-join it.
>
> However do carefully inspect your hardware, this should only happen if
> you have bad hardware or a VM environment that is not propagating
> write barriers.
>
> If you keep backups you may be able to work out when it happened and
> correlate with an unexpected poweroff etc.
>
> I wrote with Rusty a tool ldbdump to recover data from such databases,
> if you have stranded data, but returning it to the replicated state is
> still non-trivial.
>
> I hope this helps,
>
> Andrew Bartlett
>
> --
> Andrew Bartlett
> https://samba.org/~abartlet/
> Authentication Developer, Samba Team         https://samba.org
> Samba Development and Support, Catalyst IT
> https://catalyst.net.nz/services/samba
>
>
>
>
>


-- 

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Edson Tadeu Almeida Silveira
http://sites.google.com/site/edsontadeu/
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