[Samba] Samba HA issue

[John Du]

David Christensen wrote:
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> Liutauras Adomaitis wrote:
>   
>> On Tue, Aug 4, 2009 at 7:39 PM, David
>> Christensen<David.Christensen at viveli.com> wrote:
>>     
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>>> With samba configured for high availability using heartbeat, I am not
>>> able to join new computers to the domain after a fail over.  If I fail
>>> back to the "main" samba instance I can join the computer to the domain.
>>>
>>> However With samba in a fail over state and running on the backup PDC
>>> users can still authenticate and gain access to their shares.
>>>
>>> I have the two instances of samba configured nearly identical except for
>>> having them pointed to the instance of ldap that is running on the
>>> server itself (which is being replicated).  Is there something else,
>>> some tdb file etc,  that needs to be shared between the two instances of
>>> samba so a fail over appears identical to the ldap backend?
>>>
>>> Thanks.
>>>       
>> If you are running PDC+BDC configuration with LDAP backend with
>> replication, then you must have master to master replication. In case
>> of master - slave replication you canot write ot slave while your
>> muster is not accessible. Usual slave has a redirection to master for
>> write operations. Slave is readonly and thats why you can authenticate
>> to BDC, but cannot join new machines to the domain.
>> This may be your case
>>
>> Liutauras
>>     
>
> Liutauras,
>
> I have ldap using master-master replication so writing to either ldap
> instance is no problem.  In addition I have both instances of samba
> configured as PDC's (the smb.conf file is identical on both PDC's except
> for two things, the ldap each talks to and the host name of the PDC
> itself; not using the netbios parameter), however only one of them is
> running at a time.  The issue occurs when the 2nd PDC comes online.
> Based on the ldap logs the query I am seeing from the 2nd PDC in a
> failed over state is not the same query that the "primary" PDC does when
> I add a new computer successfuly.  I never see the lookup for the admin
> user who has the right to add a computer, along with other missing
> search strings.
>
> Is there some SID or some other serial number etc. that the 2nd PDC is
> lacking that is causing this symptom?  Why would a query from a near
> identical instance of samba to the same ldap DB be so different?
>   
I had the same problem with samba 3.0.28 on rhel 4.  I fixed my problem 
by issuing "net rpc grant .." commands on the backup PDC.  I never 
understood why it behaved that way but those commands worked for me.  I 
thought those rights were in the LDAP database but it seemed that those 
rights are stored on the individual servers somehow.


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