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  • Launchpad Entry: NovaSpec:multinic-libvirt
  • Created: Ilya Alekseyev
  • Contributors: Eldar Nugaev, Ilya Alekseyev


We need support for multiple network interfaces per instance for libvirt. Our vision based on http://wiki.openstack.org/multi-nic specification. with some additions.

Release Note

This is implementation same functionality as in https://blueprints.launchpad.net/nova/+spec/multi-nic for libvirt. Multiple NIC for libvirt allows users to have instances connected to several networks. Implementation of this blueprint is first step in add support multi-nics for libvirt.


User stories



https://blueprints.launchpad.net/nova/+spec/multi-nic GD PoC branches: https://code.launchpad.net/~ilyaalekseyev/nova/libvirt-multinic-experemental


UI Changes

Code Changes

I. libvirt connection changes
   changes in libvirt_con.to_xml() propagate NIC data
I. firewall rules changes
   All firewall drivers would be changed to support multiple networks per instance. iptable rules should be changed.
I. network managers changes
  1. FlatManager: open question - seems it is not required to be changed, but we need to check it
  2. FlatDHCPManager should be changed to support multiple networks
  3. VlanManager should be changed to support multiple networks
I. template changes
  Add support of several NICs to template:
#!highlight xml
#for $nic in $nics
        <interface type='bridge'>
            <source bridge='$nic.bridge_name'/>
            <mac address='$nic.mac_address'/>
            <!--   <model type='virtio'/>  CANT RUN virtio network right now -->
            <filterref filter="nova-instance-$nic.name">
                <parameter name="IP" value="$nic.ip_address" />
                <parameter name="DHCPSERVER" value="$nic.dhcp_server" />           
#if $getVar('extra_params', False)
#end if
#if $getVar('ra_server', False)
                <parameter name="RASERVER" value="$nic.ra_server" />
#end if
#end for


Test/Demo Plan

We need both unit and integration tests. Second is more important.

Unresolved issues

BoF agenda and discussion