[Samba] Dynamic Updates to Bind DLZ through DHCP have repeated errors in syslog

[Rowland penny]

On 28/01/2021 14:10, ralph strebbing via samba wrote:
> Thanks for the advice Rowland, we're now running Samba 4.13.3, and I've
> updated the script with the one you've provided. The problem I'm running
> into now is when a client get a DHCP lease, it adds it to DNS, and then we
> create a static mapping after the fact for a different IP (This is common
> here especially while testing some server VMs that eventually go into
> production on a different more permanent subnet); The script runs to
> release the existing record in DNS, but fails because it can't find the
> record (See log snippet below).
>
> Similarly, when the add function is run afterwards to add the new entry,
> we're left with 2 separate records in DNS for the same hostname with
> different IP addresses.
> http://haste.thegamingcorner.net/rucuvanuxe.sql
>
> Record Add Log:
> http://haste.thegamingcorner.net/qulivuwome.sql
>
> It's also worth noting that no matter what so far, when the script adds new
> records, it does seem to add them correctly, but the reverse DNS portions
> of the script aren't running, or something weird is happening on the
> backend because there is no result code for those that are being returned
> (hence the Update Failed: 0:0::) message. Got any suggestion for what I may
> be missing on my end for that one?
>
> Thanks Again!
> Ralph
>
> On Thu, Jan 28, 2021 at 6:30 AM Rowland penny <rpenny at samba.org> wrote:
>
>> On 28/01/2021 09:59, Rowland penny via samba wrote:
>>> On 27/01/2021 20:43, ralph strebbing via samba wrote:
>>>> So I'm upgrading our current NT4 domain to Samba AD with Bind9 DNS. Our
>>>> current DHCP/DNS setup is on one server, separate from the Domain
>>>> server.
>>>> With Samba AD, we'll be using Samba's tools to manage the DNS, thus
>>>> allowing use of things like the Windows Server Admin Tool suite (DNS, AD
>>>> Users & Groups, etc.). So Bind9, isc-dhcp-server, and Samba is all
>>>> going to
>>>> be on the same machine for the new setup.
>>>>
>>> OK, you have identified a problem with the script 😅
>>>
>>> However, this error has nothing to do with the script:
>>>
>>> ERROR(runtime): uncaught exception - (9711,
>>> 'WERR_DNS_ERROR_RECORD_ALREADY_EXISTS')
>>>
>>> This is being caused by a bug in the 'samba-tool dns' code and was
>>> fixed in early 2020, so you need to upgrade Samba to 4.13.x
>>>
>>> I will have a look at the dhcp update script and get back to you.
>>>
>>> You also shouldn't need the 'rndc.key'
>>>
>>> Rowland
>>
>> OK Ralph, can you try the attached new version of the script 😁
>>
>> Rowland
>>
>>
>>
>>
I have been using the script in its basic form for about 8 years now and 
it has never really failed for me, but then I don't allow dhcp to create 
a dns record in AD (the default reason for the script) and then manually 
change the computers ipaddress. Of course you are getting two IP's for 
each hostname, the script creates one and then you come along and add 
another one. If you are going to give your computers a fixed IP, do not 
use dhcp or rewrite my script to do what you require.

You appear to using the script to do something it was never designed to, 
I will not alter it to do what want, it would have little use outside of 
yours and I would have no way of testing it.

Rowland