Open Stack

Hi Ahmed -

I have logged a doc bug to clear up this mismatch:
https://bugs.launchpad.net/openstack-manuals/+bug/1061352.

Appreciate you asking!

Here's some explanation for each setting.
fixed_range - fixed block of IP addresses handed out to VMs as they're
provisioned. So these could be a 10.0.0.0/4 block if you want, or the
192... block.
public_interface - some say this needs to be a physical nic, but when
you're running a POC on a VM on a laptop in VirtualBox for example, it
can be br100. It's what DevStack defaults to. This setting indicates
the interface nova-network uses to send the floating ip traffic on the
correct network. So if you have nova-network on each compute node then
yes, it belongs on the compute node.

The Install/deploy guide walks through Flat DHCP as the network
manager. If you use --network_bridge=br100 when you run the
nova-manage network command, nova will set up the bridge for you. This
example command uses 192.168.100.0/24 for the fixed range of IP
addresses: http://docs.openstack.org/trunk/openstack-compute/install/apt/content/compute-create-network.html

Hope this helps.

Others on the list, feel free to correct my explanations as needed!
Thanks,
Anne

On Wed, Oct 3, 2012 at 6:46 PM, Ahmed Al-Mehdi <ahmed at coraid.com> wrote:
> Hello,
>
> I am following the steps in "OpenStack Install and Deploy – RedHat Ubuntu"
> (Folsom) to setup a Controller node.  The section "Configuring OpenStack
> Compute" (
> http://docs.openstack.org/trunk/openstack-compute/install/apt/content/compute-minimum-configuration-settings.html
> )  gives a snippet of an example of the values of parameters in the
> nova.conf file.
>
> The document first lists some common settings in nova.conf file.  I am
> highlighting the following two which I am concerned about:
>
> fixed_range=192.168.100.0/24
> public_interface=eth0
>
> The Document right after gives the whole content of a sample (usable)
> nova.conf file for the Controller Node, in which the above settings are set
> as follows:
>
> fixed_range=10.0.0.0/24
> public_interface=br100
>
> I am assuming "fixed_range=192.168.100.0/24" is the correct setting.
> However, can someone please help as to the correct setting of
> "public_interface".   And the same setting value would be applicable for the
> Compute Node, is that right?
>
> Thank you very much in advance.
>
> Regards,
>
> Ahmed.
>
>
>
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