[Samba] Failover DC did not work when Main DC failed

[L.P.H. van Belle]

What do you see/get when you run: 

dig NS $(hostname -d) 
With 2 dc's you should see 2 records. 

In the past this was a bug at samba joins so only 1 NS record existed. 
Worth to have a look at. 

And adding this to /etc/resolv.conf:
options timeout:2
options attempts:3
options rotate 

Also might help.

Greetz,

Louis


> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Paul 
> Littlefield via samba
> Verzonden: woensdag 12 februari 2020 10:48
> Aan: Kris Lou; samba
> Onderwerp: Re: [Samba] Failover DC did not work when Main DC failed
> 
> On 11/02/2020 23:33, Kris Lou via samba wrote:
> > Is DC4 listed in in an A record for your mycompany.com?
> > 
> > Do logs show that it's answering requests during the course 
> of a normal
> > workday?
> > 
> > If so ... time to simulate DC3 failure, I guess.
> 
> Hi Kris,
> 
> Thanks for taking the time to reply.
> 
> I've been using Samba for what seems like a lifetime and it's 
> only by sheer fluke that this "bug / situation" was found 
> where either Samba DC AD is not correct and/or the QNAP 
> server does not like talking to the Samba 4 domain when one 
> of the DCs is not available!
> 
> In answer to your questions...
> 
> Yes, DC4 is listed in an A record.
> 
> Which log file can I check, for either AD or DNS requests?
> 
> Yes, indeed... I am going to create 2 DC VMs on my laptop and 
> turn one off to see what happens.
> 
> Stay tuned.
> 
> Regards,
> 
> -- 
> 
> Paul Littlefield
> 
> Telephone: 07801 125705
> Email: info at paully.co.uk
> Wiki: http://wiki.indie-it.com/wiki/Special:AllPages
> LinkedIn: https://www.linkedin.com/in/paullittlefield
> 
> Paul Littlefield is environmentally responsible. Please 
> consider the environment before printing this email. This 
> email and any attachment is intended for the named addressee 
> only, or person authorised to receive it on their behalf. The 
> content should be treated as confidential and the recipient 
> may not disclose this message or any attachment to anyone 
> else without authorisation. If this transmission is received 
> in error please notify the sender immediately and delete this 
> message from your email system. All electronic transmissions 
> to and from me are recorded and may be monitored. Finally, 
> the recipient should check this email and any attachments for 
> viruses. Paul Littlefield accepts no liability for any damage 
> caused by any virus transmitted by this email.
> 
> Ubuntu 18.04.3 LTS (x86_64)
> 
> Tmesis is a linguistic phenomenon in which a word or phrase 
> is separated into two parts, with other words interrupting 
> between them... well, abso-blooming-lutely.
> 
> 
> -- 
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba
> 
>