Makes sense. Thank you, Ian.
Also for anyone who will stumble upon this thread in the future, this issue
<https://github.com/golang/go/issues/25336> shows what impact on
performance consulting every server would have.
пятница, 15 марта 2019 г., 18:42:47 UTC+3 пользователь Ian Lance Taylor
написал:
>
> On Fri, Mar 15, 2019 at 8:31 AM Timofei Bredov <timofe...@gmail.com
> <javascript:>> wrote:
> >
> > Context: I use go version go1.12 linux/amd64. I have a VPN set up which
> has private DNS server. This server can resolve URLs that have top level
> domain name ".custom-tld".
> >
> > File /etc/resolvconf has the following content:
> >
> > nameserver 8.8.8.8
> > nameserver 1.1.1.1
> > nameserver 192.10.10.18
> >
> > When I try to use net.LookupSRV("", "", "service.name.custom-tld") it
> returns "no such host" error because it tries the first server and then
> fails after host name is not found. However local DNS resolver works as
> expected and resolves the URL no problem.
> >
> > I have two questions:
> >
> > Should default DNS resolver for linux platform use every server in
> /etc/resolvconf to try to lookup a URL?
> > What is a better way to handle DNS resolution in that situation?
>
> In general the Go resolver is intended to work like the historic C
> resolver. The historic C resolver will query one nameserver. If that
> nameserver times out, it will try the next one. See "man
> resolv.conf". So if one of your name servers is returning "no such
> host", then both the Go and C name servers will stop at that point.
>
> One common approach for this situation would be to use a single
> nameserver line and point it to a DNS server that replies with the
> desired result for your special domain and otherwise forwards the
> query to a normal caching resolver.
>
> Ian
>
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