[OpenAFS] changing just the name of a database server?

[Jeffrey Altman]

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On 12/21/2017 2:36 AM, Benjamin Kaduk wrote:
> On Wed, Dec 20, 2017 at 12:08:33PM -0500, Steve Gaarder wrote:
>>
>> On Wed, 20 Dec 2017, Benjamin Kaduk wrote:
>>
>>> Hi Steve,
>>>
>>> On Tue, Dec 19, 2017 at 09:19:36AM -0500, Steve Gaarder wrote:
>>>> I want to change the name of one of my database servers, while keepi=
ng the
>>>> IP address the same.  Besides making the change in the DNS and the
>>>> machine's hostname, is there anything else I need to do?
>>>
>>> You should also notify cellservdb@grand.central.org so that the
>>> central CellServDB records can be updated.  IIRC, at least windows
>>> clients use the name after the '#' for address lookups -- it is not
>>> just a comment field.
>>>
>>
>> Thanks for that info.  Does it matter whether the name is a CNAME or n=
ot?=20
>> I'm thinking that, to ease the transition, I could make the new name a=
=20
>> CNAME for the existing name, tell grand.central to change the cellserv=
db,=20
>> and later rename the machine.
>=20
> This is pretty far outside my area of expertise, but some code
> diving suggests that the OpenAFS client will follow a CNAME if the A
> record is included in the additional section of the DNS response
> that has the CNAME in the answer section, but will not initiate an
> additional DNS request to follow the CNAME.  It's possible that the
> Auristor client has implemented that TODO item, but I have no way to
> check.
>=20
> -Ben

When building a DNS SRV or DNS AFSDB record you MUST use names that can
be resolved by A and AAAA records.   However, you can use CNAME records
for the name listed in the CellServDB file.

This is true not only for OpenAFS but for AuriStorFS as well.

Jeffrey Altman



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