[Samba] second dc not working properly

Rowland penny rpenny at samba.org
Tue Dec 8 21:35:27 UTC 2020

On 08/12/2020 21:09, Jason Keltz via samba wrote:
> I'm running Samba 4.11.16 on CentOS 7 and not having much luck with 
> failover to a second domain controller.  I could *really* use some help.
> I know my Samba config is fine.  I know that adding the second domain 
> controler was fine.  Replication is working perfectly.  No errors.   
> If I stop the DC processes on either server, Windows clients appear to 
> failover perfectly fine.
> The problem seems to affect my Linux clients (CentOS 7) running winbind.
> Let's say a CentOS 7 client X is connected to dc2, and I stop the DC 
> processes on dc2....  The odd time, the client will connect to dc1 
> almost right away, and everything just works the way it should always 
> work.
> However, most of the time, I stop the DC processes on dc2, the client 
> will connect to dc1, I can even do a "wbinfo -u" or "wbinfo -g", but 
> "whoami" reveals "user doesn't exist".  Somewhere between 20-50 
> minutes later, it just "magically" works.  The timing doesn't seem 
> consistent.  Even a reboot doesn't fix things when it's in this state.
> I've tried to follow the Samba logs, but I really can't figure out 
> what's up.  Andrew? Jeremy? Anyone?
> I don't think this can be just my system.  I suspect there's a lot of 
> users out there running multiple DCs with a similar setup to me, 
> believing that it's all working, and maybe, because there hasn't been 
> a failure, everything works great, but who knows what will happen when 
> there's actually a failure.
> Jason.
Try adding these lines to the /etc/resolv.conf on the Linux clients:

options rotate

options timeout:1


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