libvirt users - Aug 2017 - Re: network configuration for guest specific dns-servers

Hello,

similar to how one can configure guest specific IP addresses via mac
addresses:
<ip address="192.168.122.1" netmask="255.255.255.0"
localPtr="yes">
  <dhcp>
    <range start="192.168.122.100"
end="192.168.122.254"/>
    <host mac="00:16:3e:77:e2:ed" name="foo.example.com"
ip="192.168.122.10"/>
    <host mac="00:16:3e:3e:a9:1a" name="bar.example.com"
ip="192.168.122.11"/>
  </dhcp>
</ip>

We would like to configure guest specific dns-servers as would be done
with the --dhcp-option of dnsmasq.  I was expecting to be able to do
something like:

    <host mac="00:16:3e:77:e2:ed" 
	name="foo.example.com" 
	ip="192.168.122.10" 
	dhcp-option="dns-server,127.0.0.1" />

but it seems that this isn't the correct approach, as virsh net-edit
default removes that attribute definition.

Could someone point me to the correct documentation?

Thank you!
David Ayers



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On Thu, Aug 31, 2017 at 12:10:22AM +0200, David Ayers
wrote:
>Hello,
>
>similar to how one can configure guest specific IP addresses via mac
>addresses:
><ip address="192.168.122.1" netmask="255.255.255.0"
localPtr="yes">
>  <dhcp>
>    <range start="192.168.122.100"
end="192.168.122.254"/>
>    <host mac="00:16:3e:77:e2:ed"
name="foo.example.com" ip="192.168.122.10"/>
>    <host mac="00:16:3e:3e:a9:1a"
name="bar.example.com" ip="192.168.122.11"/>
>  </dhcp>
></ip>
>
>We would like to configure guest specific dns-servers as would be done
>with the --dhcp-option of dnsmasq.  I was expecting to be able to do
>something like:
>
>    <host mac="00:16:3e:77:e2:ed"
>	name="foo.example.com"
>	ip="192.168.122.10"
>	dhcp-option="dns-server,127.0.0.1" />
>
>but it seems that this isn't the correct approach, as virsh net-edit
>default removes that attribute definition.
>
AFAIK the support for this was not added.  Feel free to request this in
our bugzilla [1] so that we can track it.  Or, even better, send a patch
if you have some time ;) It should not be difficult.
>Could someone point me to the correct documentation?
>
Sure! [2]
>Thank you!
>David Ayers
>
You are welcome.

Martin

[1]
https://bugzilla.redhat.com/enter_bug.cgi?product=Virtualization%20Tools&component=libvirt
[2] https://libvirt.org/formatnetwork.html
>
>
>--
>David Ayers - Team Austria
>Free Software Foundation Europe (FSFE) []          (http://www.fsfe.org)
>Join the Fellowship of FSFE!         [][][]      (https://fsfe.org/join)
>Your donation powers our work!         ||       (http://fsfe.org/donate)

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Thanks a lot, Martin!

Am Donnerstag, den 31.08.2017, 10:11 +0200 schrieb Martin
Kletzander:
> On Thu, Aug 31, 2017 at 12:10:22AM +0200, David Ayers wrote:
> >
> >We would like to configure guest specific dns-servers as would be done
> >with the --dhcp-option of dnsmasq.  I was expecting to be able to do
> >something like:
> >
> >    <host mac="00:16:3e:77:e2:ed"
> >	name="foo.example.com"
> >	ip="192.168.122.10"
> >	dhcp-option="dns-server,127.0.0.1" />
> >
> >but it seems that this isn't the correct approach, as virsh
net-edit
> >default removes that attribute definition.
> >
> 
> AFAIK the support for this was not added.  Feel free to request this in
> our bugzilla [1] so that we can track it.  Or, even better, send a patch
> if you have some time ;) It should not be difficult.
Okay, I'll be sure to add it to bugzilla sometime soon.

Your request for a patch implies that this would be a welcome feature
and will not be rediscussed on its principal merit correct?
(implementation details notwithstanding ;-) )

The reason I ask, is that I do not have a development environment ready
for libvirt and there will be quite a bit work before I've read through
all your guidelines, setup a development VM (I suppose that should be
easiest with the latest stable release of Fedora, RHEL or CentOS?)

I'm not sure yet that I can muster up the time, but it does seem
interesting, so a may give it shot.  It would be very disappointing if
it then were rejected on principle.

Thank you!
David

-- 
David Ayers - Team Austria
Free Software Foundation Europe (FSFE) []          (http://www.fsfe.org)
Join the Fellowship of FSFE!         [][][]      (https://fsfe.org/join)
Your donation powers our work!         ||       (http://fsfe.org/donate)