[ubuntu-za] kvm br0

[Morgan Collett]

On Wed, Aug 11, 2010 at 21:35, Charl Wentzel
<charl.wentzel at vodamail.co.za> wrote:
> Hi Guys
>
> We're setting up a Core i3 for a small virtual host running KVM on Ubuntu
> 10.04.  Everything when well until we tried to create a bridge interface to
> eth0 for the virtual guest servers.  (The default interface virbr0 is NAT'ed
> so we need another bridge interface without NAT to access the guest servers)
>
> The standard instructions basically require:
> a. install bridge-utils
> b. modify /etc/network/interface to configure br0
> c. restart networking
>
> However, the system fails to create br0, no such device.  I'm pretty sure
> you need to create br0 somewhere, but I can't find proper instructions to do
> so.  I tried to create it with "brctl addbr br0".  It created the bridge,
> but networking would not restart and complained about something related to
> eth0.  When I rebooted, br0 was gone.
>
> Does anyone know of more detailed instructions?

Hi Charl

This is my config on a Dell R710 server running KVM with multiple VMs,
each on their own public IP address:

/etc/network/interfaces:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet manual

# Bridge interface for KVM
auto br0
iface br0 inet static
        address XX.XX.XX.XX
        netmask XX.XX.XX.XX
        network XX.XX.XX.XX
        broadcast XX.XX.XX.XX
        gateway XX.XX.XX.XX
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers XX.XX.XX.XX
        bridge_ports eth0
        bridge_fd 9
        bridge_hello 2
        bridge_maxage 12
        bridge_stp off


Basically, put what you have for eth0 (IP address, netmask, broadcast,
gateway) into the br0 section instead...

Regards
Morgan

>
> Regards
> Charl
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