libvirt users - Nov 2016 - Attach libvirt guest to an existing openvswitch port

Good day gentlemen.
I am building a study project and trying to configure openvswitch vlans
outside libvirt by means of openvswitch itself.

Somehow with interface types 'bridge' and 'network', libvirt
does attach
domain to the existing port specified in <target dev=''/>, wiping
the
exixting settings and always deletes this port upon domain shutdown,
thus making me loose ovs configuration.

Could you, please, tell me how should I configure an interface or
libvirt itself to avoid this libvirt's greedines.

libvirt 2.4.0

Thak you.
Ivan.

On 11/13/2016 01:23 PM, Ivan Borodin wrote:
> Good day gentlemen.
> I am building a study project and trying to configure openvswitch vlans
> outside libvirt by means of openvswitch itself.
>
> Somehow with interface types 'bridge' and 'network',
libvirt does attach
> domain to the existing port specified in <target dev=''/>,
wiping the
> exixting settings and always deletes this port upon domain shutdown,
> thus making me loose ovs configuration.
>
> Could you, please, tell me how should I configure an interface
You can set the vlan tag for an interface plugged into an OVS switch 
with the <vlan> tag:

      <interface type='bridge'>
         <source bridge='ovsbr0'/>
         <virtualport type='openvswitch'>
            <parameters interfaceid='.....'/>
         <virtualport>
         <vlan>
              <tag id='42'/>
         </vlan>

http://www.libvirt.org/formatdomain.html#elementVlanTag

(if you want vlan trunking, you can use <vlan trunk='yes'>, and
then can
specify multiple <tag> subelements for which vlan tags you want to allow.)

If you want a simpler way to have all the guests on a particular switch 
use the same vlan tag, you can define a libvirt network that points to 
the OVS switch, set a vlan tag to be used for all guests connecting to 
that network, then define your guest's interface as <interface 
type='network'>, pointing to this new network definition. Details for
that can be found at:

http://www.libvirt.org/formatnetwork.html

(search for "openvswitch" and "vlan").
>   or
> libvirt itself to avoid this libvirt's greedines.
>
> libvirt 2.4.0
>
> Thak you.
> Ivan.
>
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