[Samba] resolv.conf setup and DNS issue

[Rowland Penny]

On 30/01/15 19:05, Tim wrote:
> I'm happy to see that our "samba pros" do not share the same point of view. :-)
>
> In Marcs link, as far as I can see, number 3 points to Rowlands solution while number 2 seems to be Marcs preferred solution.
>
> Today I changed DNS settings on my DCs to Rowlands solution (127.0.0.1) and an issue I had with sysvolcheck seems to gone.
>
> So what best practise does the samba team have?
>
> @Marc: The topic seems to be more important than I initially thought. So thanks for putting this on your list to do.
>
> Am 30. Januar 2015 16:10:11 MEZ, schrieb "L.P.H. van Belle" <belle at bazuin.nl>:
>> So if i did read right . ..
>>
>> In my case..
>> I have 2 DC ( with bind9 dns DLZ ) and i have 2 proxy servers with DNS
>> (bind9) slaves for the DC's.
>>
>> I should point my /etc/resolv.conf of the DC's also to the slave dns
>> servers?
>> and in case of just 2 dc's without slave dns servers,
>> point the DC1 to DC2 dns and DC2 to DC1 dns ?
>> If thats the case i have to change my scripts ;-)
>>
>>
>> Greetz,
>>
>> Louis
>>
>>> -----Oorspronkelijk bericht-----
>>> Van: mmuehlfeld at samba.org
>>> [mailto:samba-bounces at lists.samba.org] Namens Marc Muehlfeld
>>> Verzonden: vrijdag 30 januari 2015 15:33
>>> Aan: Rowland Penny; samba at lists.samba.org
>>> Onderwerp: Re: [Samba] resolv.conf setup and DNS issue
>>>
>>> Am 29.01.2015 um 21:36 schrieb Rowland Penny:
>>>> I just use 127.0.0.1 on each DC, after all, the DC should
>>> use itself for
>>>> DNS and if something has gone wrong, having another DC to
>>> ask may not be
>>>> any use.
>>>
>>> If you're having more than one DC, then you should not use the own DNS
>>> as primary on a DC. It can cause problems like DNS islanding.
>>>
>>> Some DNS best practices:
>>> http://blogs.technet.com/b/askds/archive/2010/07/17/friday-mail
>>> -sack-saturday-edition.aspx#dnsbest
>>>
>>>
>>> We should mention this on the "Join as DC" page and somewhere
>>> on the DNS
>>> pages, too. I'll put this on my list.
>>>
>>>
>>> Regards,
>>> Marc
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>>>
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I loved this bit: '(This is where the arguments usually start)' :-D

Hmm, what I think it means is:

If you have 2 DC's (in my case 192.168.0.2 & 192.168.0.3)

you should have in /etc/resolv.conf on 192.168.0.2

search example.com
nameserver 192.168.0.3
nameserver 127.0.0.1

and on 192.168.0.3

search example.com
nameserver 192.168.0.2
nameserver 127.0.0.1

Rowland