在此输入代码...
在 2016年5月6日星期五 UTC+8上午9:43:50，Ben Noordhuis写道：
>
> On Thu, May 5, 2016 at 9:00 AM, Yun Feng Ma <yunf...@gmail.com
> <javascript:>> 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.
>
Thanks, Ben, for the reply.
In our environment, the first nameserver is our internal DNS server, which
is used to resolve some internal domain names; the second nameserver is the
public nameserver (like google DNS server 8.8.8.8), so this code
dns.resolve('www.google.com','A',function(err, addresses) { }) will get
failed, because the first nameserver returns NXDOMAIN for "www.google.com".
Do you have any solution for this?
Thanks.
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