On Thu, May 5, 2016 at 9:00 AM, Yun Feng Ma <yunfen...@gmail.com> wrote:
> Hi everyone!
>
> The dns.resolve tries to send request to only the first nameserver in
> /etc/resolv.conf, and if the first nameserver fails to resolve the name,
> dns.resolve just returns and doesn't try to send request to the second
> nameserver. Is this work-as-design?
>
> Here is an example: the /etc/resolv.conf is like below in Linux:
> 75.2.4.5
> 75.4.7.6
>
> Run below codes:
> dns.resolve('demo1.sample.com','A',function(err, addresses) {
> console.log(err);
> console.log(addresses);
> });
>
> The 'demo1.sample.com' is defined in the second nameserver (75.4.7.6), so
> the above codes always failed, because the dns.resolve doesn't try to call
> the second nameserver.
>
> I found nodejs has flag to control this:
> https://github.com/nodejs/node/blob/master/deps/cares/src/ares_init.c#L255
> seems like the default behaviour is only call the first nameserver, is there
> any way to make dns.resolve to call all nameservers in /etc/resolv.conf
> until succeed?
>
> Thanks a lot.
The second nameserver is only tried when the first one times out or
returns a malformed reply. If the first server replies with NXDOMAIN
(domain not found), the second one isn't contacted; that shouldn't be
necessary because DNS is a global registry after all.
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