We have traced the issue to the Kubernetes DNS server, kube-dns. It is
returning compressed hostnames in SRV query responses. It can be reproduced
by running
The following app exits with an error in MiniKube (or any other Kubernetes
cluster with kube-dns).
cannot unmarshal DNS message - Target: compressed name in SRV resource data
func main() {
_,_, err := net.LookupSRV("dns-tcp", "tcp", "kube-dns.kube-system")
if err != nil {
log.Fatal(err)
}
}
Is it worth creating an issue around this? We have extracted the DNS client
from `net` and are currently using it with the compressed flag enabled to
allow compressed hostnames - the behavior that existed in go 1.10 and
earlier.
On Wednesday, August 29, 2018 at 4:57:04 PM UTC-6, Jason Newman wrote:
>
> This code works in our Kubernetes cluster when compiled with Go 1.10 and
> does not work when compiled with Go 1.11, we are using the built-in Go
> resolver.
>
> https://play.golang.org/p/JNSJEm1n6hg
>
> On Wednesday, August 29, 2018 at 4:28:54 PM UTC-6, Nathan Fisher wrote:
>>
>> Can you share examples?
>> On Wed, Aug 29, 2018 at 19:08, <ja...@squarepenguin.com> wrote:
>>
>>> We are using SRV records in Kubernetes for various purposes and Go 1.11
>>> no longer supports compressed names in SRV resource data (
>>> https://github.com/golang/net/commit/24dd3780ca4f75fed9f321890729414a4b5d3f13#diff-47e2241916c7047eab73daf76c89fc3fR2055).
>>>
>>> The error we are getting is "cannot unmarshal DNS message" and the
>>> underlying error is "Target: compressed name in SRV resource data".
>>>
>>> Ultimately, we believe the issue lies with dnsmasq returning a
>>> non-compliant SRV response, but it is stopping us from upgrading to Go1.11.
>>> Are there any known workarounds which would allow us to handle these
>>> noncompliant SRV responses?
>>>
>>>
>>>
>>>
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>>
>
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