[Samba] Bind_DLZ and two AD DC
Bob of Donelson Trophy
bob at donelsontrophy.net
Fri Oct 21 19:00:04 UTC 2016
On 2016-10-21 13:50, Alex Crow via samba wrote:
> On 21/10/16 19:26, Bob of Donelson Trophy via samba wrote:
>> My first Active Directory setup had two DC's and shortly after getting
>> things going the second DC created a hardware failure issue and I just
>> continued life with one DC.
>> Now, while upgrading I am returning to two DC's.
>> In a normal Bind9 "master and slave" setup the master always "feeds" the
>> With Bind9_DLZ setup (recommended to be used with Samba4) there is no
>> "master and slave" setup. This "master and slave" configuration is NOT
>> recommended for use in our (Samba4) situations and/or a Bind9_DLZ
>> How does Bind9_DLZ "keep up" with each other (in a two AD DC
>> environment) when one of the DC's go "off line"? The second DC continues
>> to maintain the connections. When the first DC returns, how does it
>> "catch up" so to speak?
>> Probably been asked many, many times but I am finding conflicting info.
>> A brief explanation would be appreciated?
> In DLZ Bind loads helper libraries that cause domain records to be
> obtained from the AD databases maintained by Samba. If your Samba
> replication is working OK then your domain and forest DNS records should
> be replicated too.
> I'm not sure about timeouts for Samba AD DCs but in theory replication
> should just carry on when your old DC comes back,
> Maybe add this to the Wiki page about DLZ to make it clear that no
> bind-based master/slave is required?
> If your first DC failed hard did you make sure it was removed with
> "samba-tool domain demote --remove-other-dead-server=<olddcname>?
> This message is intended only for the addressee and may contain
> confidential information. Unless you are that person, you may not
> disclose its contents or use it in any way and are requested to delete
> the message along with any attachments and notify us immediately.
> This email is not intended to, nor should it be taken to, constitute advice.
> The information provided is correct to our knowledge & belief and must not
> be used as a substitute for obtaining tax, regulatory, investment, legal or
> any other appropriate advice.
> "Transact" is operated by Integrated Financial Arrangements Ltd.
> 29 Clement's Lane, London EC4N 7AE. Tel: (020) 7608 4900 Fax: (020) 7608 5300.
> (Registered office: as above; Registered in England and Wales under
> number: 3727592). Authorised and regulated by the Financial Conduct
> Authority (entered on the Financial Services Register; no. 190856).
Thanks for your reply.
The DC failure I was referencing actually happened two years ago. I just
continued with one DC for the time being. I do not remember what all I
did, back then, to clear out the dead DC2 but, with all the recent
documentation updates on the wiki I have been enjoying reading and in
some case re-reading the wiki info.
To answer your suggestion, I have already had the pleasure of "demoting"
a dead DC and it went just like the wiki said it would.
The documentation is very good and getting better all the time!!
Bob Wooden of Donelson Trophy
More information about the samba