SRV Record Server Availability

Andrew P. andrewemt at hotmail.com
Wed Jan 6 16:42:47 UTC 2021


Isn't this sort of dynamic functionality (real-time presence or absence of SRV records) what mDNS and the avahi daemon are for?

________________________________________
From: bind-users <bind-users-bounces at lists.isc.org> on behalf of Matus UHLAR - fantomas <uhlar at fantomas.sk>
Sent: Wednesday, January 6, 2021 8:51 AM
To: bind-users at lists.isc.org
Subject: Re: SRV Record Server Availability

On 06.01.21 21:41, Wilfred Sarmiento via bind-users wrote:
>Your understanding is correct, i just thought that SRV can detect whose
>server is alive so it can choose and provide an answer with the available
>Server.

DNS is not designed to provide this functionality. While technically you can
change contents of DNS depending on which servers are alive and which are
not, it's almost never a good idea.

That means, BIND has nothing like this built in.

>> On Tue, Jan 5, 2021 at 4:30 AM Wilfred Sarmiento via bind-users
>> <bind-users at lists.isc.org> wrote:
>> > Is DNS Bind SRV record can detect the Server's availability? If yes, how?

>On Tue, 5 Jan 2021, 23:53 tale <d.lawrence at salesforce.com> wrote:
>> Could you provide more information about your goal?  I don't fully
>> understand the question.
>>
>> For my reading, the answer is basically no, in that an SRV record just
>> provides data about where.a particular service can be found.  It's up
>> to other systems to fetch that data and interpret it, including
>> whether that service is actually available at the given endpoint.  In
>> its typical operation, BIND will just take whatever name and port the
>> zone administrator said to provide for that SRV record, and not do any
>> sort of availability checks on it.
>>
>> However, if you go deep into a far more complicated, custom use of
>> BIND, you could set up a process that monitors the availability and
>> changes the SRV record accordingly.

--
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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