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Date: Thu, 28 Sep 2017 12:55:28 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Cc: Srinivasa Raghavan <raghav135@...il.com>
Subject: Re: DNS resolution happenning only after timeout

On Thu, Sep 28, 2017 at 12:28:55PM +0200, Szabolcs Nagy wrote:
> * Srinivasa Raghavan <raghav135@...il.com> [2017-09-28 15:45:28 +0530]:
> > When using "Alpine" docker image which uses musl-libc, we are facing delay
> > when we do operations like below in our production environment,
> > 1. ping <name>
> > 2. nslookup <name>
> > 3. traceroute <name>
> > 4. http request from node.js
> > 
> 
> this bug may be related:
> https://github.com/rancher/rancher/issues/9961

Yes, I just filed it after reading the discussion on IRC and this bug
report that was linked as describing similar behavior:

https://github.com/rancher/rancher/issues/4177#issuecomment-332571951

This really requires a fix on the rancher-dns side. I'm not sure
exactly what glibc is doing, but it couldn't be giving the behavior
you want without doing something wrong: it's falling back and trying
different search domains when it hasn't been told that the first one
doesn't exist, only that the nameserver is experiencing a problem.

Rich

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